Nothing goes together better together than Halloween science and young kids! I can’t tell you how much I love the fun science activities that the Halloween season brings around. We particularly love Halloween science experiments! Join us as we count down with 31 Days of Halloween STEM. You are sure to find tons of ideas here to make your Halloween amazing!

Halloween and Science

This season we enjoyed more fizzy Halloween science experiments, but we have also tried out a few different slime ideas too! I am excited to say that we had a lot of fun with every activity.  

I also feel confident in saying that the Halloween science activities below are pretty much foolproof and easy to prep with common household ingredients!

Sometimes you have lots of great ideas but not enough time to try everything! Most of these activities will work at home as well as in the classroom with a couple of kids or a group of kids.

Remember that you can tweak these Halloween ideas to fit your needs too.  Great for preschoolers to early elementary-aged kids!

Learn how to make homemade slime, explore how ice melts, blow bubbles, try fizzy eruptions all using ingredients or supplies found in your kitchen or pantry.

Why Science Is Important For Young 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 inexpensive 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.

Get your FREE printable Halloween science project guide!

10 Must Try Halloween Science Activities

How to use this resource? Click on the links below to find out how to set up each Halloween science activity for your kids!

If you are looking for more awesome Halloween science ideas, make sure to check out our collection of Halloween slime recipes, Halloween science experiments and Halloween STEM activities.

Also, we have a list of Halloween preschool activities that kids are sure to enjoy!

Halloween Floam

Squishy, moldable Halloween Floam is the perfect sensory treat for kids this Halloween.

Witch’s Brew Fluffy Slime

Fluffy slime has such an amazing texture for little hands to play with. Find out how little Witch’s and wizards can get into the fluffy slime making fun this Halloween!

Halloween Peeps Slime 

I don’t want to alarm you, but you might find eyes in your slime. Yes, I am talking about the eyes of Peeps! We tried something different around here and made a Peeps Candy Halloween slime.

Taste safe slime is great for kiddos who like to sample what they make!

Ghost Bubbles

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

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 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 Balloon Experiment

Preschoolers will love watching this fun Halloween science experiment. Blow up a ghostly Halloween balloon with a simple chemical reaction.

Rotting Pumpkin Jack

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


Dissolving Candy Corn

This dissolving candy corn experiment is a neat Halloween science experiment that is easy to set up with only a few supplies needed!


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.

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!


  1. Fun! My boys would love those slime projects. I’ll have to see if I can muster enough courage to try one. . .

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