Halloween + science = AWESOME Halloween science experiments! Easy Halloween experiments using simple supplies make for creative STEM projects for all ages. When you aren’t out pumpkin picking and cider donut eating this fall, try out a couple of these Halloween science experiments. Make sure to join us for 31 Days of Halloween STEM Countdown.

Explore Halloween Science

Any holiday is a perfect opportunity for creating simple but AMAZING science activities. We think Halloween tops the chart for cool ways to explore science and STEM all month long.

From gelatin hearts, to wizards brew, erupting pumpkins, and oozing slime, there are tons of spooky Halloween science experiments you will want to try.

Kids love theme science activities and it gets them learning, and loving it! These Halloween science experiments and activities below work for kids ages pre-k through to early elementary and older.

Get started exploring chemistry and physics with easy to set up and inexpensive science activities this Halloween.

Looking for ideas for younger kiddos? Make sure to check out these Halloween sensory activities and Halloween activities for toddlers to preschoolers.

Why Science Is Important For Kids

Kids are curious and always looking to explore, discover, check out, and experiment to find out why things do what they do, move like they move, or change like they change! Indoors or outdoors, science is definitely amazing! Holidays or special occasions just make science all the more fun to try!

Science surrounds us, inside and out. Kids love checking things out with magnifying glasses, creating chemical reactions with kitchen ingredients, and of course exploring stored energy! Check out 100 genius STEM projects to get started any time of the year including the other “big” days.

Science starts early, and you can be a part of that with setting up science at home with everyday materials. Or you can bring easy science to a group of kids! We find a ton of value in cheap science activities and experiments.

Helpful Science Resources To Get You Started

Here are a few resources that will help you introduce science more effectively to your kiddos or students and feel confident yourself when presenting materials. You’ll find helpful free printables throughout.

5 Tips For Easy Halloween Science

Halloween-themed science experiments can be a fantastic way to engage kids in learning while having fun. Here are five tips for conducting Halloween experiments with your kids either at home or in the classroom.

TIP 1: Add In Halloween Colors & Accessories

Select experiments with spooky or Halloween-related themes. For example, experiments involving witches’ brew (chemical reactions), ghostly balloons (static electricity), or creepy-crawly critters (biology) can capture kids’ imaginations and enthusiasm.

TIP 2: Ask Questions

Encourage students to actively participate in the experiment by asking questions, making predictions, and recording observations.

TIP 3: Explain the Science

Take the time to explain the scientific principles behind the experiments. Use simple and age-appropriate language to help kids understand the “why” and “how” of each experiment.

TIP 4: Experiment

Encourage creativity by allowing kids to make predictions, create hypotheses, and design their experiments (within safety guidelines). Learn more about using variables in science.

TIP 5: Dress Up

Completely optional of course! Incorporate Halloween-themed props, decorations, or costumes to make the experiments even more festive and engaging.

Amazing Halloween Science Experiments

Each year we add to our growing collection of Halloween science experiments. This year is no exception and we have a fun lineup to share. Of course, we also have plenty of Halloween slime recipes to get you started. Slime is AMAZING chemistry!

Holiday science like these Halloween experiments should be fun and stress-free for everyone! Click on the links below to read more about how to do each Halloween science experiment.

NEW! Flying Ghost Teabags

Think you have seen flying ghosts? Well maybe you can with this easy flying tea bag experiment. All you need are a few simple supplies for a fun floating tea bag science experiment with a Halloween theme.

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Flying Tea Bag

Halloween Slime

Our Halloween slime collection has everything you need for making the BEST Halloween slime recipes including fluffy slime, erupting potions slime, pumpkin guts slime, and even taste safe or borax free slime. The possibilities are endless once we show you how to master slime making!

And yes, slime making even fits into the NGSS standards for grade 2, states of matter!

You will want to make these Halloween slime recipes:

Wizard or Witch’s Brew

Well that’s we call it! This simple Halloween experiment is an exothermic reaction which may sound scary but it’s really a whole lot of foamy fun. A few simple ingredients from the grocery store and you’re exploring some great chemistry for Halloween.

Gelatin Heart Experiment

Gelatin isn’t just for dessert! It’s for Halloween science too with a creepy gelatin heart experiment that will have your kids squealing with grossness and delight.

Frankenstein’s Frozen Brain

Wouldn’t Dr. Frankenstein be proud of your Halloween frozen brain activity which explores the properties of water. Is it a liquid or a solid?

Erupting Jack O’Lantern 

This Halloween science experiment is going to get a bit messy, but it’s super cool! An erupting Jack O’Lantern is a must try at least once!

Spooky Liquid Density Experiment

Explore the density of liquids with an easy to set up spooky Halloween liquid density experiment with items around the house.

Fizzy Ghosts Experiment

Kids love anything that fizzes, so our ghost theme baking soda and vinegar experiment is perfect for little hands!

Halloween Candy Experiments

We all know what happens Halloween night… Our kids get a ton of candy that often goes uneaten or we would wish it would go uneaten. Instead of arguing with the kids over how much candy to eat, encourage them to try candy science experiments instead.

Ghost Bubbles 

Build bubbling ghosts with this simple ghost experiment ever scientist will enjoy!

Spider Oobleck

Spidery Oobleck is cool science to explore and has only 2 basic kitchen ingredients.

Spidery Ice Melt

Ice melt science is a classic experiment. Add a spooky spidery theme with this Spidery Ice Melt .

Halloween Lava Lamp Experiment

This lava lamp experiment  is a hit all year round but we can make it a bit creepy for Halloween by changing up the colors and adding accessories. Explore liquid density and add in a cool chemical reaction too!

Bubbling Brew Experiment

Mix up fizzy bubbly brew in a cauldron fit for any little wizard or witch this Halloween season. Simple household ingredient create a cool Halloween theme chemical reaction that is just as much fun to play with as it is to learn from!

Halloween Oobleck

Oobleck is a classic science activity that is easy to turn into Halloween science with a few creepy crawly spiders and a favorite theme color!

Frozen Hands

Turn an ice melting science activity into a creepy fun Halloween Melting Ice Experiment this month! Super simple and super easy, this frozen hands activity is sure to be a big hit with kiddos of all ages!

Halloween Bath Bombs

Kids will have creepy clean fun with these scented googly eyed Halloween Bath Bombs. They are just as fun for kids to make as they are fun to use in the bath!

Puking Pumpkin Experiment

Kids will love making their own puking pumpkin for Halloween with a few simple household ingredients.

Halloween Balloon Experiment

Blow up a ghostly Halloween balloon with a simple chemical reaction.

Ghostly Floating Drawing

Is it magic or is it science? Either way this floating drawing STEM activity is sure to impress! Create a dry erase marker drawing and watch it float in water.

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Rotting Pumpkin Jack

Pair a fun pumpkin book with a rotting pumpkin experiment for all things Halloween science.

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Bonus Halloween STEM Activities

Skeleton Bones Bridge

This Skeleton Bone Bridge Challenge is a fantastic STEM challenge for Halloween using super simple materials and is perfect for one kiddo or a large group!

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Skeleton Bridge

Halloween Candy Catapult

Newton has nothing on our DIY popsicle stick catapult for Halloween! Explore the laws of motion while flinging eyeballs or Halloween candy around the room.

Pumpkin Geoboard

A twist on the classic geo board activity when you use a pumpkin instead of a board. A halloween geoboard offers some great fine motor skills practice too!

Ghostly Structures

A Halloween twist on a classic STEM building activity. Challenge your kids to build the tallest ghost with this styrofoam ball project. We simply grabbed materials to use from the dollar store.

More Fun Halloween Activities

Make sure to check out our list of easy Halloween art projects and crafts, as well as Halloween LEGO Challenges and Halloween STEM activities. Of course, all things pumpkin science is perfect for Halloween.

Printable Halloween STEM Activities Pack

150+ Pages of Halloween-Themed Materials!

This Halloween project pack is suitable for home, school, and group use for kids in grades Kindergarten through elementary but is scaleable for many ages and abilities.

What’s Included:

  • 25+ Halloween theme science and STEM activities with printable sheets, instructions, and useful information all using easy-to-source materials perfect for limited-time needs. Includes a Halloween engineering pack with fun, problem-based challenges for kids to solve!
  • The skeleton activity pack includes building a skeleton challenge and a coding challenge! Try a skeleton bones bridge-building STEM challenge!
  • Halloween theme brick printable activities for hands-on learning with math that is perfect for early finishers or home fun and reinforces basic math concepts.
  • Bonus fun pack includes games and activities to round out your Halloween theme activities such as I Spy, bingo, matching, Would You Rather cards, scavenger hunt, word search, A-Z Halloween hunt, and a coloring page.
  • Halloween STEAM Pack includes artist-inspired projects by Warhol, Lichtenstein, and more!

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  1. Pingback: Creepy Frozen Brain Halloween Science Activity for Kids
  2. Pingback: Halloween Slime Recipes and Ideas For Kids To Make {Videos Too!}
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