Countdown to Halloween with 31 Days of Halloween STEM projects for the month of October! Or if you really love Halloween, why not get a jump on our Halloween STEM challenges and start early? Halloween is the perfect holiday for all sorts of themed science experiments
31 Days Of Halloween STEM Activities
Check out the links below to learn how to set up your Halloween STEM activities. Try one or all. Go in any order!
NEW! Flying Bat Paper Airplane STEM Activity
Fold up a flying bat plane for a spooky theme this Halloween and explore aerodynamics or bat anatomy!
Halloween Bone Bridge Challenge
Build a bridge out of only bones (aka cotton swabs) that is a minimum of one foot long and sits at least one inch off the ground or table. Sounds too easy? Or does it!
Halloween Slime
Learn about chemistry with our Halloween slime recipes. Our collection has everything you need for making the BEST Halloween slime including fluffy slime, zombie slime, bat slime, erupting potions slime, pumpkin guts slime, and even taste-safe Halloween peeps slime. The possibilities are endless once we show you how to master slime making!
Rotting Pumpkin Jack Experiment
Carve a pumpkin and let it rot. Investigate what happens and explore decomposition for creepy Biology!
Dissolving Candy Corn Experiment
Iconic Halloween candy mixed with simple STEM activities for a cool Halloween STEM challenge you can set up quickly.
Build Ghostly Stryofoam 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.
Growing Crystal Pumpkins
Make your own crystal pumpkins with a fun twist on a classic borax crystal experiment.
Ghost Pumpkin Eruptions
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!
Halloween Density Experiment
Explore the density of liquids with an easy to set up spooky Halloween liquid density experiment with items around the house.
Halloween LEGO Building Ideas
Build with LEGO and make some cool Halloween LEGO decorations like this spooky LEGO ghost.
Halloween LEGO Challenge Cards
Add these free Halloween LEGO challenge cards or task cards to your bin of bricks! Celebrate spooky fun with building LEGO!
New! Download this free 31 Days of Halloween calendar 👇. Save it to your computer and then click the links to learn more about each activity. Print a copy and hang it up as a reminder all month long.
Spider Halloween Oobleck
Spidery oobleck is cool science to explore and has only 2 basic kitchen ingredients with our easy recipe.
Bubbling Brew Experiment
Mix up your own bubbling 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!
Vampire Blood Slime {taste safe}
Make slime taste safe and completely borax free! We tried something a little different with this Metamucil Halloween slime recipe.
Set Up Specimen Bottles
I am sure you have seen these grow animals before, try turning them into creepy animal specimen bottles? Kids love this simple science activity and get a huge kick out of the results. These might just be inexpensive novelty items, but there is a bit of science too!
Vampire 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.
Frozen Frankenstein Brains
Ice melting science is a real treat any time of the year, and it’s very easy to apply fun themes like this Frankenstein’s frozen brain!
Build an Edible Haunted House
This super easy to build haunted house is perfect for many ages to enjoy, even the adults too!
Halloween Tangrams
It’s fun to pair a favorite holiday with a great, hands-on math lesson. Create Halloween-themed pictures using simple shapes. It’s not quite as easy as it looks, but it encourages kids to get thinking!
Make Bubbling Ghosts
Build bubbling ghosts with this simple ghost experiment every scientist will enjoy!
Halloween Balloon Experiment
Take the Halloween Stem challenge. Can you inflate a balloon without blowing air into it yourself? Find out how with our Halloween balloon experiment. All you need are a few simple ingredients!
Set Up A Pumpkin Pulley System
Test your engineering skills to build your own pumpkin pulley simple machine for a fun Halloween STEM activity. Just a few simple items and you have a great pumpkin themed simple machine to play with indoors or outdoors.
Pick A Pumpkin Book
Pick a Halloween Book and come up with your own STEM challenge. See our list of pumpkin books!
Pumpkin Clock
Make a clock using pumpkins to power it. Really? Find out how to make a powered pumpkin clock for a fun Halloween STEM Challenge.
Race Car STEM Activities
Add a pumpkin to your race track. Engineer a pumpkin tunnel or create a jump track for your cars.
Halloween Candy Catapult
Design and build a pumpkin catapult from Popsicle sticks for a fun Halloween STEM challenge.
Halloween Lava Lamp Experiment
Do you want to try a little spooky science this year? Our Halloween lava lamp experiment is perfect for young mad scientists!
Candy Corn Gears
Candy is great for another awesome STEM activity for kids. For a Halloween twist, make your own gears with candy corn. Explore how gears work while you test out your engineering skills.
Zombie Fluffy Slime
Brains and more brains with our homemade zombie theme fluffy slime recipe. Perfect for kids who love all things zombie for a cool Halloween STEM activity.
Rolling Pumpkins
Set up your own ramps from cardboard, wood, or even rain gutters. See how small pumpkins roll down different ramps and angles. Does a pumpkin roll?
Puking Pumpkin
Chemistry and pumpkins combine for a unique erupting science activity!
YOU MAY ALSO LIKE: Mini Pumpkin Volcano
Halloween Bath Bombs
Chemistry in the bath tub with fizzing eyeball Halloween bath bombs you can make easily with the kids. Explore a cool chemical reaction between an acid and base while you get clean!
Flying Tea Bag Ghosts
Have you seen flying ghosts? Well, maybe you can with this easy flying tea bag experiment. You only need a few simple supplies for a fun floating tea bag science experiment with a Halloween theme.
Floating Ghost Drawing
These floating drawing experiments are super easy to do and they always amaze the kids!
Roll A Skeleton Halloween Game
Add some math to your Halloween STEM activities. This fun printable game involves rolling a dice to get the corresponding skeleton part. Then, kids make the parts out of playdough and add them to the coffin. The result is a whole skeleton lying in a coffin!
Also check out our printable roll a Jack O’Lantern game.
Halloween Art Activities
Go ahead and add some of these favorite Halloween art activities to your countdown!
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 helpful 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 bone 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, such as I Spy, bingo, matching, Would You Rather cards, scavenger hunt, word search, A-Z Halloween hunt, and a coloring page.
- The Halloween STEAM Pack includes artist-inspired projects by Warhol, Lichtenstein, and more!
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