58 Simple and Fun Science Activities for Preschoolers

Every day is a new opportunity for our youngest learners to ask “Why?” over and over. Tap into that curiosity with these fun and engaging science activities for preschoolers. These simple experiments incorporate many preschool favorites like playing with bubbles or water, making arts and crafts, and, of course, making a mess!

To make things even easier, we’ve rated every one of these science activities for preschoolers based on difficulty and materials.

Difficulty:

Easy: These are low- or no-prep experiments you can do pretty much anytime
Medium: These take a little more setup or a longer time to complete
Advanced: Experiments like these take a fairly big commitment of time or effort

Materials:

Basic: Simple items you probably already have around the house
Medium: Items that you might not already have but are easy to get your hands on
Advanced: These require specialized or more expensive supplies to complete

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Plus, click the button below to receive a copy of our free printable Science Experiment Recording Sheet.

Science Experiment Recording Sheet for Preschoolers

Water Preschool Science Experiments

These water activities for preschoolers help teach little learners a variety of science concepts. (These can get a little messy, so you might want to try them outside.) Find even more water science activities here.

Child standing behind row of glass jars with colored water in them as an example of science activities for preschoolers — Mama Papa Bubba

1. Make music with xylophone bottles

Difficulty: Easy / Materials: Basic

The classic experiment using varying levels of water in glasses or bottles is even more fun when you add some food coloring. Experiment with different water depths and mallet styles to make all kinds of beautiful music.

Learn more: Xylophone Bottle

An instructor on a video screen with a worksheet in the foreground — We Are Teachers

2. Make giant bubbles

Difficulty: Easy / Materials: Medium

Kids (and let’s face it, adults too) will definitely get a kick out of this fun science experiment. Learn how to make the bubble solution as well as the giant wand in our free video at the link below.

Learn more: Giant Bubbles

Glass of blue liquid with rice floating and moving in it — Green Kid Crafts

3. Watch rice dance in water

Difficulty: Easy / Materials: Basic

There are lots of cool baking-soda-and-vinegar experiments out there (ever made your own volcano?), but this one is always a favorite with little ones. The acid-base reaction causes the rice to dance and jump around in the water for an effect that is just so cool!

Learn more: Dancing Rice

Preschool student squeezing a bottle of vinegar into muffin tin cups filled with baking soda and food coloring as an example of science activities for preschoolers — Busy Toddler

4. Reveal colors with chemical reactions

Difficulty: Easy / Materials: Basic

Preschool science experiments often include a combination of baking soda and vinegar like this one. Fill muffin tins with a drop of food coloring, then top it with baking soda. Finally, let kids squirt in vinegar to reveal fabulous foamy hues. (Be sure to wear eye protection for this one.)

Learn more: Fizzy Fun

Preschool science student placing objects in bins of water to see if they sink or float — Fun With Mama

5. See what sinks and what floats

Difficulty: Easy / Materials: Basic

This preschool science activity helps kids learn to construct a hypothesis, conduct a simple experiment, and then sort their findings by property.

Learn more: Sink or Float Experiment

Preschool science student mixing various solids into glasses of water — Hands On as We Grow

6. Learn what dissolves in water

Difficulty: Easy / Materials: Basic

Engage in more water play by having kids predict which items will dissolve in water and which ones won’t. Have kids keep track of the results so they can see if they have anything in common.

Learn more: What Dissolves in Water?

Plastic bin of colored water, with red on top and blue on the bottom as an example of science activities for preschoolers — Mombrite

7. Watch hot water rise and cold water sink

Difficulty: Easy / Materials: Basic

This early exploration into the concept of density is always impressive to see in action. Have kids discover how hot water rises and cold water sinks. Explain that the same applies to air, and see if kids can think of a way to observe that in action too.

Learn more: Water Density Experiment

Paper towel strip draped between two glasses of water, with colorful marker rainbow ink moving from each side to meet in the middle — Mombrite

8. Grow a paper towel rainbow

Difficulty: Easy / Materials: Basic

“Capillary action” might be a real mouthful for preschool science students, but they don’t need to remember the term to be impressed by this experiment. All you need are markers, a paper towel, and two glasses of water.

Learn more: Capillary Action Experiment

Square glass vase filled with water with shaving cream floating on top. Food coloring is dripping down through the cream into the water. — One Little Project

9. Make shaving cream rain clouds

Difficulty: Easy / Materials: Basic

One of our favorite science activities for preschoolers. This is a classic science activity every kid should try at least once. It helps them understand how clouds become so saturated with water that they must release it in the form of rain.

Learn more: Shaving Cream Rain Clouds

Preschool science student blowing a tower of soap bubbles as an example of science activities for preschoolers — Happy Hooligans

STEM Challenges for Preschoolers

STEM challenges give students a chance to try solving problems on their own. Give them some basic supplies and instructions, then let them experiment until they find a solution to the challenge.

Toy bears stacked on plastic cups, wood craft sticks, and index cards — Forward With Fun

11. Rescue toys from hot lava

Difficulty: Easy / Materials: Basic

While you might not want pre-K kids climbing all over the classroom furniture to play “The Floor Is Lava,” they can do the same thing with their toys in this cute STEM challenge.

Learn more: The Floor Is Lava

A little one kneels beside a catapult built from colored popsicle sticks — Go Science Kids

12. Build a catapult

Difficulty: Easy / Materials: Basic

Challenge students to build a catapult using just three items: Popsicle sticks, elastics, and a plastic spoon or bottle cap. You’ll definitely want to have an extra set of adult hands available as this can prove challenging for pre-K kids. Finally, bring plenty of marshmallows or pom-poms to launch.

Learn more: Popsicle Stick Catapult

Three pieces of paper folded into columns as circle, square, and triangle as an example of science activities for preschoolers — All for the Boys

13. Discover strength in shapes

Difficulty: Easy / Materials: Basic

Learn shapes while also practicing some basic science. Fold paper into various shapes to form columns and ask kids to predict which will be able to support the most books.

Learn more: Which Shape Is Strongest?

A hand places blue gems into a boat made from aluminum foil in a tub of water — Messy Little Monster

14. Build an aluminum foil boat

Difficulty: Easy / Materials: Basic

Teach kids about buoyancy and physics while having fun in the process. First, give your students some tinfoil and challenge them to build a sturdy boat. Then, challenge them to fill the boat with as many objects, such as gems, as they can without it sinking.

Learn more: Aluminum Foil Boat

Worksheet showing drawing of a boot, covered with various materials like plastic, foil, and paper — Science Sparks

15. Waterproof a boot

Difficulty: Easy / Materials: Basic

Ask kids to select various materials and tape them over the free boot printable found at the link. Then, test their hypotheses to see which ones work best.

Learn more: Waterproof a Boot

Children building a tower to the ceiling using building blocks — Mama Smiles

16. Reach for the sky

Difficulty: Easy / Materials: Basic

Round up all your building blocks and try this whole-class project. What will students need to do to be able to construct a tower that reaches all the way to the ceiling?

Learn more: Tower Engineering Challenge

Two students measuring paper chains — Frugal Fun for Boys and Girls

17. Link up the longest paper chain

Difficulty: Easy / Materials: Basic

This incredibly easy preschool STEM activity really gets kids thinking. The challenge? Create the longest possible paper chain using a single piece of paper. So simple and so effective.

Learn more: Paper Chain Challenge

Child using toothpicks and pieces of apple to build a tower on a paper plate as an example of science activities for preschoolers — N Family Club

18. Build an apple-toothpick tower

Difficulty: Easy / Materials: Basic

Put a healthy spin on a classic STEM challenge by substituting apple pieces for marshmallows. Kids will have a tasty snack when they’re done!

Learn more: Apple Toothpick Tower

Preschooler making a stack of red plastic cups and index cards — The Salty Mamas

19. Stack up plastic cups

Difficulty: Easy / Materials: Basic

Kids absolutely love stacking cups! Turn the play into a STEM challenge by adding index cards into the mix. Kids can experiment to see if they can build taller towers with or without the cards.

Learn more: Solo Cup Engineering Challenge

20. Craft a nest

Difficulty: Easy / Materials: Basic

Take a nature walk and pick up items like sticks, leaves, and more. Then, build your own bird nests to protect little eggs and hatchlings.

Learn more: Build a Nest at Pink Stripey Socks

A preschooler constructs a bridge from red solo cups and popsicle sticks as an example of science activities for preschoolers — Mommy Poppins

21. Be bridge-builders

Difficulty: Easy / Materials: Basic

Use everyday classroom objects to build bridges and test their strength. See how many objects (beads, toys, school supplies, etc.) each bridge can hold before it collapses.

Learn more: Build a Bridge

A colorful pyramid of building blocks made from segments of egg cartons — The Pinterested Parent

22. Construct with egg carton building blocks

Difficulty: Easy / Materials: Basic

These colorful building blocks are not only pleasantly tactile, they’re made from bio-degradable materials. A win-win!

Learn more: Egg Carton Building Blocks

A basket filled with everyday items for young students to explore — The Educators’ Spin on It

23. Put together a tinker kit

Difficulty: Easy / Materials: Basic

Young kids really don’t need fancy, expensive equipment to learn about and enjoy science. A basket full of everyday items, most available at the dollar store, and a big imagination are all it takes.

Learn more: Tinker Kit

Seasonal Science Activities and Experiments for Preschoolers

Whether you’re looking for Halloween science activities, winter science experiments, or Easter egg activities, find them all (and more) here!

Hands shown holding artificial snow from a pile as an example of science activities for preschoolers. — The Elf on the Shelf

24. Make artificial snow

Difficulty: Easy / Materials: Basic

No snow where you live? Make some yourself! Find easy recipes for “snow” using baking soda, shaving cream, cornstarch, and other household items. Experiment to find the one that works best.

Learn more: Make Pretend Snow

Thermometers and white mittens, with a child's hand inside one mitten — Classroom Magic

25. Explore how mittens keep you warm

Difficulty: Easy / Materials: Basic

Ask little ones if mittens are warm, and they’ll likely answer yes. But when they measure the temperature inside an empty mitten, they’ll be surprised by what they find. Learn about body heat and insulation with this easy experiment.

Learn more: Mitten Body Heat Experiment

Glass jar of snow, measured with a ruler, next to a glass jar of melted snow water marked with measurements — KC Edventures

26. Measure the water content of snow

Difficulty: Easy / Materials: Basic

Two inches of snow is not the same as 2 inches of rain. This easy winter science experiment measures the amount of water actually found in an inch of snow.

Learn more: How Much Water Is in Snow?

A brown eggshell with the top broken off, with grass growing out of its top and a face drawn on it. Scissors are lying nearby with grass clippings as an example of science activities for preschoolers. — Mother Natured

27. Grow grass in an eggshell

Difficulty: Medium / Materials: Medium

What’s more fun than a preschool science experiment that doubles as a craft? You’ll need eggs, soil, grass seeds, water, and a permanent marker to bring this project to life. Kids will especially love personalizing their eggshell.

Learn more: Egg Grass Heads

A decomposing jack-o-lantern pumpkin — Gift of Curiosity

28. Observe a pumpkin decomposing

Difficulty: Easy / Materials: Easy

When Halloween is over, plop your jack-o’-lantern pumpkin in the garden and observe it each day. Kids will learn how organic matter breaks down over time.

Learn more: Pumpkin Decomposition

Child using a magnet to make a tissue paper — STEAM Powered Family

29. Send a ghost flying with magnets

Difficulty: Medium / Materials: Medium

Use magnets along with a few other supplies to make a tissue ghost seem to float in midair! It’s the perfect spooky Halloween science activity for preschoolers.

Learn more: Flying Ghosts

Bunny-shaped marshmallow Peeps with sails made from toothpicks and construction paper as an example of science activities for preschoolers — Lemon Lime Adventures

30. Conduct experiments using marshmallow Peeps

Difficulty: Easy / Materials: Medium

Pick up a package of marshmallow Peeps (they’re usually available during all seasons of the year now), and try turning them into little boats. Experiment with different sail sizes and types, and figure out how to make the candy boats go faster.

Learn more: Marshmallow Peep Boat Challenge

Yellow plastic egg that looks like a chicken, turned into a toy rocket using Alka-Seltzer tablets — The STEM Laboratory

31. Launch plastic egg rockets

Difficulty: Easy / Materials: Medium

Put on some safety goggles and get ready for liftoff! This simple experiment uses Alka-Seltzer tablets to turn eggs into rockets.

Learn more: Easter Egg Rockets

Construction paper turkey with feathers made of baking soda, foaming after vinegar has been added — 123 Homeschool 4 Me

32. Dissolve colorful turkey “feathers”

Difficulty: Easy / Materials: Basic

Baking-soda-and-vinegar experiments are always popular, and this one is so cute for the Thanksgiving season. Build your own little turkey with baking soda feathers, then watch them foam up and dissolve when you add some vinegar.

Learn more: Turkey Feather Science

More Science Activities for Preschoolers

These science activities and experiments give preschoolers a chance to explore all sorts of science concepts, from plants and animals to germs and gravity and beyond.

Two eggs side by side. One still in the shell, the other after being submerged in vinegar for a while as an example of science activities for preschoolers — We Are Teachers

33. Make a bouncy egg

Difficulty: Medium / Materials: Basic

Never underestimate the power of vinegar! See the striking result when you soak an egg in vinegar for hours.

Learn more: Bouncy Eggs

Printable worksheet showing the plant life cycle in a circle as an example of plant life cycle activitiesas an example of science activities for preschoolers — We Are Teachers

34. Learn about the plant life cycle in a hands-on way

Difficulty: Medium / Materials: Medium

Inspire a passion for gardening by planting seeds and watching them grow together. Download our free worksheets and classroom slides for an entire plant unit below.

Learn more: Plant Life Cycle Resources

Screenshot of a video for a dancing popcorn experiment as an example of science activities for preschoolers — We Are Teachers

35. Boogie down with some popcorn

Difficulty: Medium / Materials: Medium

Try this super-fun experiment that gets popcorn dancing! Then, make a little popcorn in the microwave, put on some music, and have a dance party.

Learn more: Dancing Popcorn

Several apple slices are shown on a clear plate next to labelled cards — Teaching With Jennifer Findley

36. Slice apples to learn about oxidation

Difficulty: Easy / Materials: Basic

Here’s another classic preschool science activity: using apple slices to learn about oxidation (and how to prevent it). When you’re done, you’ve got a tasty snack to eat too.

Learn more: Apple Oxidation

Four construction paper people are shown. One is wearing a hat, one is wrapped in plastic wrap, one is plain, and one is wearing sunglasses. — 123 Homeschool 4 Me

37. Show why sunscreen is important

Difficulty: Easy / Materials: Basic

First, have your students make four construction-paper people, each with varying conditions. Wrap one in plastic wrap, cover another in sunscreen, put a hat on one and a set of sunglasses on another. Ask kids to hypothesize what will happen when they’re left out in the sun, then see if they’re right!

Learn more: Sunscreen Experiment

Blocks set on a piece of white paper with shadows behind them — Science Sparks

38. Engage in shadow science

Difficulty: Easy / Materials: Basic

Set blocks or small shaped objects on a sheet of paper. Then set the paper in direct sunlight. Watch as the shadow changes throughout the day. Have students trace the shadows with a pencil or marker.

Learn more: Shadow Science

Magic Milk Experiment How to Plus Free Worksheet as an example of science activities for preschoolers — We Are Teachers; Myranda McDonald

39. Mix up some “magic” milk

Difficulty: Easy / Materials: Basic

A drop or two of dish soap will make food coloring dance and swirl across the surface of a shallow bowl of milk. Preschool science experiments often seem like magic, but this one is all about surface tension and chemical reactions.

Learn more: Magic Milk

Kids hold up their hands, which are covered in glitter, in front of them — We Are Teachers

40. See how easily germs spread

Difficulty: Easy / Materials: Basic

We love science activities for preschoolers that remind them of the importance of good handwashing. Help them see why it’s so important with this simple experiment that uses glitter to stand in for germs.

Learn more: Teach Kids About Germs Using Glitter

Child spraying colored water onto wax paper — Housing a Forest

41. Experiment with wax paper

Difficulty: Easy / Materials: Basic

This wax paper experiment is interesting from both a science and an art perspective. Ask kids to think about why wax paper behaves differently than other paper they use for art projects.

Learn more: Wax Paper Resist

Muffin tin with different objects in each well as an example of science activities for preschoolers — Frugal Fun for Boys and Girls

42. Predict and observe what will melt in the sun

Difficulty: Easy / Materials: Basic

You’ll need a hot sunny day for this preschool science experiment. Help students choose a variety of items to place into a muffin tin and have them predict which ones will melt. Set the tin out in the sun for an hour or two, then bring it in and record your results.

Learn more: Melting Science

An assortment of different size balls on the grass — Science Sparks

43. Drop balls to introduce gravity

Difficulty: Easy / Materials: Basic

Gravity can be a complicated subject, but all pre-K kids need to understand the basics. Drop balls of all sizes to discover that they all fall in the exact same way.

Learn more: Ball Drop Gravity Race

Preschool science student sending a rock down a playground slide — Buggy and Buddy

44. Head to the playground to explore gravity and friction

Difficulty: Easy / Materials: Basic

What goes up must come down! A playground slide is the perfect place to help kids understand gravity. This is a good chance to learn about friction too.

Learn more: Playground Science

Preschool science student using a bar magnet to test other objects as an example of science activities for preschoolers — Prekinders

45. Test objects with magnets

Difficulty: Easy / Materials: Medium

Magnets are undeniably a source of fascination for kids. At this stage, you can worry less about explaining how magnets work and instead just let kids explore which items are attracted to magnets and which aren’t. Sort the items into categories, then see if the items have anything in common.

Learn more: Magnet Experiments

Glass bowl covered in plastic wrap with confetti on top, and a tuning fork touching the plastic — Hands On Teaching Ideas

46. See sound waves in action

Difficulty: Easy / Materials: Medium

This series of simple experiments lets kids see sound waves at work. Start by making waves with a Slinky, then move on to tuning forks and bouncing confetti.

Learn more: Sound Experiment

An orange is shown in a bowl with a pitcher of red liquid pouring into the cut off top of it. — The Art Kit Blog

47. Make an orange volcano

Difficulty: Easy / Materials: Basic

Making erupting volcanoes is a staple of any childhood! We love this easy volcano experiment using an orange, baking soda, and vinegar.

Learn more: Orange Volcano

Rainbow colored jars with rock candy sticks in each as an example of science activities for preschoolers — Growing a Jeweled Rose

48. Grow delicious rock candy crystals

Difficulty: Medium / Materials: Basic

Preschoolers love science activities that involve food. While crystal experiments are a hit with kids of any age, this one is perfect for the young crowd. It requires a little patience, but kids get to eat the yummy results!

Learn more: Kool-Aid Rock Candy

Young student using a straw in a plastic bag with sponges to move a green pompom across a wood table — Kids Activities Blog

49. Move pom-poms with air pressure

Difficulty: Easy / Materials: Basic

Understanding the idea that air can have enough force to move objects can be a little challenging, but this simple experiment brings that concept to life. We love that this experiment is affordable since most people (especially teachers) already have these materials on hand.

Learn more: Air Pressure Experiment

A little girl hanging a cup on a homemade scale made from a plastic clothes hanger — Go Science Kids

50. Make a balance scale

Difficulty: Easy / Materials: Basic

This simple balance scale is so easy to make yet provides endless opportunities for weighing all kinds of objects. Have kids assemble a scale from a plastic hanger, a few paper cups, and some string, then let them hypothesize which items will be heavier and which will be lighter.

Learn more: DIY Balance Scales

A pink plastic comb attracts pieces of confetti through static electricity as an example of science activities for preschoolers — Go Science Girls

51. Explore the principle of static electricity

Difficulty: Easy / Materials: Basic

The concepts of negative and positive properties of atoms may be way over the heads of preschoolers, but this fun activity is perfect for introducing the magic of science to them.

Learn more: Static Electricity Activity

Bubbly water in shades of blue and green with the caption — Happy Hooligans

52. Make an ocean in a bottle

Difficulty: Medium / Materials: Basic

Oil, water, and food coloring combine to create a mesmerizing mini ocean in a bottle.

Learn more: Ocean in a Bottle

4 glasses of water with an egg floating at a different level in each — Go Science Girls

53. Explore the concept of density

Difficulty: Easy / Materials: Basic

Why do some objects float and some sink? Does it matter what type of liquid you put them in? Explore these questions and more with this simple activity.

Learn more: Egg Float

Water is poured onto a tower of ice in a glass as an example of science activities for preschoolers — Teach Preschool

54. Make ice grow

Difficulty: Easy / Materials: Basic

Just like your favorite character from the movie Frozen, your preschoolers can have the power to make ice grow! This simple crystallization experiment will make a big impact on your little ones.

Learn more: Frozen Fun

A green leaf in a glass of red-dyed water — Buggy and Buddy

55. Watch leaves turn colors

Difficulty: Easy / Materials: Basic

Learn how a leaf gets nourishment through its network of veins, which act as a transportation route for nutrients from the stem to the tips of the leaf.

Learn more: Colored Leaves

A finger touches the surface of blue liquid sprinkled with pepper — Coffee Cups and Crayons

56. Make pepper dance

Difficulty: Easy / Materials: Basic

This science experiment is a perennial crowd favorite! Simply combine dish soap and water (and food color, if you wish) on a dish. Then cover the surface with a generous amount of pepper. Your preschoolers will giggle when the pepper scatters to the edges of the dish when they touch it with their finger.

Learn more: Dancing Pepper

Tablet with elephant toothpaste experiment materials featured on screen next to a worksheet. — We Are Teachers

57. Cook up a batch of elephant toothpaste

Difficulty: Medium / Materials: Basic

Brace yourself for a crazy eruption of giant foam when you try this fun experiment with your preschool students. Psst: It’s all in the power of yeast.

Learn more: Elephant Toothpaste

A glass of milk, a glass of water, a sliced lemon and a qtip laid out on a table — Mommy Poppins

58. Concoct a batch of invisible ink

Difficulty: Easy / Materials: Basic

Introduce your students to the secret power of invisible ink with this simple recipe. Easy to assemble, totally nontoxic, and loads of fun!

Learn more: Invisible Ink

Get my free printable

If you liked these science activities for preschoolers, grab a copy of our free printable recording sheet for your students, which can be used with any of the science experiments above.

Like these science activities for preschoolers? Don’t miss the 30 Best Educational Toys and Games for Preschool.

Plus, get all the latest teaching tips and ideas when you sign up for our free newsletters!

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58 Simple and Fun Science Activities for Preschoolers

Water Preschool Science Experiments

1. Make music with xylophone bottles

2. Make giant bubbles

3. Watch rice dance in water

4. Reveal colors with chemical reactions

5. See what sinks and what floats

6. Learn what dissolves in water

7. Watch hot water rise and cold water sink

8. Grow a paper towel rainbow

9. Make shaving cream rain clouds

STEM Challenges for Preschoolers

11. Rescue toys from hot lava

12. Build a catapult

13. Discover strength in shapes

14. Build an aluminum foil boat

15. Waterproof a boot

16. Reach for the sky

17. Link up the longest paper chain

18. Build an apple-toothpick tower

19. Stack up plastic cups

20. Craft a nest

21. Be bridge-builders

22. Construct with egg carton building blocks

23. Put together a tinker kit

Seasonal Science Activities and Experiments for Preschoolers

24. Make artificial snow

25. Explore how mittens keep you warm

26. Measure the water content of snow

27. Grow grass in an eggshell

28. Observe a pumpkin decomposing

29. Send a ghost flying with magnets

30. Conduct experiments using marshmallow Peeps

31. Launch plastic egg rockets

32. Dissolve colorful turkey “feathers”

More Science Activities for Preschoolers

33. Make a bouncy egg

34. Learn about the plant life cycle in a hands-on way

35. Boogie down with some popcorn

36. Slice apples to learn about oxidation

37. Show why sunscreen is important

38. Engage in shadow science

39. Mix up some “magic” milk

40. See how easily germs spread

41. Experiment with wax paper

42. Predict and observe what will melt in the sun

43. Drop balls to introduce gravity

44. Head to the playground to explore gravity and friction

45. Test objects with magnets

46. See sound waves in action

47. Make an orange volcano

48. Grow delicious rock candy crystals

49. Move pom-poms with air pressure

50. Make a balance scale

51. Explore the principle of static electricity

52. Make an ocean in a bottle

53. Explore the concept of density

54. Make ice grow

55. Watch leaves turn colors

56. Make pepper dance

57. Cook up a batch of elephant toothpaste

58. Concoct a batch of invisible ink

Get my free printable

Like these science activities for preschoolers? Don’t miss the 30 Best Educational Toys and Games for Preschool.

Plus, get all the latest teaching tips and ideas when you sign up for our free newsletters!

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