31 Days of Halloween STEM Activities and Projects

Halloween STEM Activities to celebrate a 31 day countdown. Includes Halloween Science, Technology, Engineering and Math, plus FREE printables, Halloween Art and Halloween Sensory activities! Updated with even more exciting Halloween Activities for 2021!

Halloween is the perfect time for some fun and engaging STEM activities. There are just so many activities that capture a child’s interest and imagination during this season, and so many of them are perfect for our young scientists! We love Halloween around here and to celebrate I’m planning 31 days of Halloween STEM Activities countdown to Halloween. Whether you are at home or celebrating in the classroom, we have activities for all ages. Join us on our month long Halloween STEM adventure!

HALLOWEEN STEM ACTIVITIES

What you will discover in this article!

Love Halloween? Love STEM? Celebrate the countdown to Halloween with our 31 Days of Halloween STEM Activities. A little Halloween STEM for every day!

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I’ve gathered up over 31 science, tech, engineering and math activities that are going to make the countdown to Halloween amazing for your children! Most of these activities are meant for elementary aged children, however I have also included activities for younger kids, plus teens and even adults. Enjoy these spectacularly spooky STEM Halloween projects!

HALLOWEEN SCIENCE ACTIVITIES

So many amazing Halloween science projects! Halloween and crazy science are a perfect fit for lots of fun and learning.

Flying Ghosts Tea Bag Experiment

This is a fun WOW worthy experiment that will excite your little scientists. Especially once their ghosts take flight! Take a moment and explore the thrilling science of Flying Tea Bag Ghosts!

Flying Tea Bag Ghosts Halloween Science Experiment

Magnetic Flying Ghosts

This is another fun flying ghosts experiment that uses the power of magnetism and a little engineering, to make ghosts fly like magic! This is a fun twist on our Wingardium Leviosa experiment for Halloween.

Flying Ghosts Halloween Magnetism Science Experiment

Halloween Skittles Experiment

Got lots of candy, no problem! Put it to great use with this Skittles Experiment. Make spooky designs, then watch the fascinating science unfold in this Halloween Skittles Experiment.

Halloween Skittles Experiment

Halloween Balloon Races

This physics challenge is a spooky fun blast! So simple to set up, kids explore Newton’s Laws of Motion as they have fun racing their Balloon creations. A fantastic project to do in the classroom, homeschool or at a Halloween Party. Check out Halloween Balloon Races.

Halloween Physics Balloon Races

Halloween Marshmallow Science

This quick and fun science experiment let’s kids also explore their artistic side before learning about the expanding energy of heat! From toddlers to teens, this Halloween Marshmallow Science is so much fun!

Halloween Marshmallow Science Experiment

Gummy Mummies

Kids love this combination of Lego, History and Science! And who doesn’t enjoy mummies at Halloween? Check out Gummy Mummies Science Experiment.

Lego Gummy Mummies are a unique experiment exploring desiccation. An excellent activity linking science and ancient historical cultures like the Egyptians.

Glow in the Dark Science

Halloween is the perfect time to add some glow to your science experiments and projects! Here we’ve gathered up our favourite Glow in the Dark activities, and included the science behind the glow for your lessons and learning.

Glow in the Dark Activities and Science

Halloween Magic Milk

Inspired by a much beloved science experiment, magic milk, we set out to mix our own Halloween colours by applying the colour wheel, then explored the magical science of Magic Milk with a Halloween twist.

Halloween Magic Milk Science Experiment

Grow Scented Halloween Crystals

Grow Your Own Scented Halloween Crystals. These decorations are extremely durable and fun to make. Exactly what we need to decorate for the big day.

Scented Halloween Crystals - A STEAM Project

HALLOWEEN CHEMISTRY FUN

Halloween Moon Dough – Fizzing Ghosts!

We LOVE moon dough! It is such an incredible sensory experience and so much fun to play with. In this spooky activity we bring in some chemistry to create a really cool fizzing ghost science experiment for Halloween. I mean really, how cute is this science???

Halloween Sensory Science Experiment

Halloween Balloon Experiment

This is a fun activity that involves a surprise! Kids can make balloons, ghosts, or anything they can imagine. Then set off the chemical reaction to reveal their spooky designs. This Halloween Balloon Chemistry Experiment is so much fun!

Halloween Balloon Science Activity for Kids

Monster Eyes – A Halloween Egg in Vinegar Experiment

Have you ever made a rubber egg? This classic chemistry project is so fun, especially with our Halloween twist where we turned them into squishy, bouncy, rubbery Monster Eyeballs!

Halloween Egg in Vinegar Monster Eyes

Hand Painted Pumpkin Bath Bombs

These bath bombs are the ultimate blend of chemistry, math and art! Make sure you get all your ingredient ratios perfect, so you can set off be best fizzy reaction, but before you do, paint your pumpkin with a special face! Halloween STEAM at it’s best! Check out this DIY Pumpkin Bath Bomb Recipe.

Hand painted pumpkin bath bomb Halloween STEAM Project

Glow in the Dark Bath Bomb With Spooky Surprise

Explore some fantastic chemistry (acid-base reactions and how things glow) while making bath bombs kids will have a blast using! Just watch out for the creepy surprise!

Glow in the dark bath bomb recipe

Monster Eye Bath Bombs

This Halloween Bath Bomb activity provides a little art with your chemistry as kids use soap to paint their bath bombs for a spooky, shudder worthy, bath bomb activity.

Halloween chemistry lesson Bloody Monster Eye Ball Bath Bombs

Halloween Fizzing Pumpkin Treasure (A perfect Halloween twist on Dino Eggs!) – Every time we do the Dino Eggs activity it is a HUGE hit with all ages, so when I saw this idea I knew it was the perfect addition to our Halloween STEM Activities Countdown!

Puking Pumpkins – Volcano Pumpkin Science Experiment

This chemistry experiment is always a HUGE hit with the kids. Carve your pumpkin then use a little chemistry to turn it into an erupting volcano pumpkin. As my son proudly declared: It’s a puking pumpkin!

Halloween Pumpkin Volcano Science Project

Make A Glow In The Dark Lava Lamp

These are so much fun, my kids love it every time we do this activity. Glow in the Dark Lava Lamps are the perfect way to take the traditional lava lamp science experiment and give it a Halloween twist.

On a black background a blue glowing lava lamp is bubbling. Overlay text says How to make a Glow in the Dark Lava Lamp

Halloween Glow Milk Plastic Activity

Make plastic figures at home with a spooky theme that actually glow in the dark! Making plastic from milk (casein) is a fantastic chemistry experiment for kids. With this twist creating Glow in the Dark Plastic Halloween Trinkets, kids will have a blast with their science lessons.

Glow in the Dark Milk Plastic - non-toxic, easy and fun kids STEM Activity. Create toys, decorations, sensory items and more. Perfect for Halloween.

CANDY & EDIBLE HALLOWEEN SCIENCE

Halloween and candy go together perfectly, so why not use some of that candy to teach a little Halloween Science?

Halloween Candy Bomblicious Recipe

These sweet treats are the perfect recipe for Halloween to make with the kids. The best part is smashing them open to find the surprises inside. A great project for a Halloween party! DIY Halloween Candy Bombs.

Homemade Halloween Candy Bombs

Candy Science

Dive in deep with a unit study into the science of candy making. Kids love Candy Science because success in this lab is sweet!

Candy Science Making Candy Fun Science lessons with a delicious result. 10 candy recipes.

Glow in the Dark Jello Recipe

Explore polymers and eat them too with this glow in the dark jello activity. Perfect for a Halloween party!

Glow In The Dark Jello With Doctor Who Awesomeness

Halloween Pressed Sugar Treats

Pressed Sugar Science is a fun and easy activity that kids of all ages enjoy!

Pressed Sugar Candy Halloween STEAM Activity - this fun and easy activity is sure to be a hit at your next Halloween science session. Chemistry + art = fun!

Layered Lollipops

A beautiful layered density experiment with candy that smells and looks amazing! If you have lots of lollipops or hard candies hanging around this Halloween, this is a great way to use them to explore scientific principles.

Layered Lollipops uses candy in a beautiful candy stem challenge

HALLOWEEN ENGINEERING

Candy Catapult

This Halloween STEM activity is an absolute BLAST! Engineer your own catapult then launch candies into pumpkins and cauldrons. Kids will learn engineering, physics and math, all while having fun! Makes a great party game or classroom project. Candy Catapult is a great Halloween game. For a different challenge, check out this pumpkin catapult made out of Lego by our friends!

Candy Catapult STEM Activity

Candy Engineering and Math Challenge

This Candy Construction STEM project is tasty fun! Learn math, physics and engineering skills, while also building critical thinking, problem solving and fine motor skills. All in one tasty, fun activity that has kids trying to hit the target with candy.

Candy Construction STEM Challenge

Build a Skeleton Hand

In this Biology STEM Activity we are building a model of the hand that is very Skeleton like! Kids can make theirs out of black construction paper and use white or glow in the dark markers/paint to decorate their spooky, moving hands. Building Skeleton Hands is a fantastic STEM challenge for Halloween.

Skeleton Hand Halloween STEM Activity

Halloween Spinning Pop Up Card

In this STEM project, kids use our free printable templates to create a Halloween card that pops up and spins. They get to pick from two different spinning designs. These Halloween STEM Cards are brilliant for Halloween party invitations.

Halloween STEM Craft Spinning Card DIY Project

Creepy Crawly Spider Soap Making Project

This might not be a traditional engineering project, but creating these soaps is a must do as part of your Halloween plans!

Creepy Homemade Spider Soaps make a great kids project, especially for Halloween

HALLOWEEN CODING, CIRCUITS AND TECH ACTIVITIES

Build a Fruit Battery out of Pumpkins!

Learn about battery cells, currents, voltage and more as you build a battery out of pumpkins and squash. Do it right and you can light an LED! Build a Pumpkin Battery this Halloween and wow your students!

Fall Harvest Fruit Battery Circuit activity

Halloween Coding Activity

Kids love this screen free printable coding activity for Halloween. A fantastic way to introduce students to sequencing, while applying their critical thinking, problem solving and attention to detail skills. Free printable included for STEAM Powered Family mailing list members. This Halloween Coding Activity is perfect for the classroom or homeschool.

Halloween Coding Printable Activities

Glow Salt Circuits

Perfect for STEMists from elementary to high school, these salt circuits are so easy to make but have big wow factor when you turn off the lights! Glow Salt Circuits are a must do with your students this Halloween.

Easy electrical circuit activity that glows in the dark

Build a Witch or Wizard Circuit Wand

Planning on heading out as a witch or wizard this year? Make your very own Circuit Wand that lights up at your command! (Or by closing the circuit)

Wizards Coding Printable

Screen Free Wizards Coding Challenge- a fun, educational, free and spooktacular coding Halloween. Try your hand at some fun screen free coding challenges with this Magical Wizards Coding Fun Pack.

Pumpkin Squishy Circuits

This is a tried and true project that is so much fun! The play dough does dry out though, so don’t make the play dough for the Pumpkin squishy circuits too far in advance of your lessons.

Crafts & Activities That Rock The Dark For The Perfect Spooktacular Halloween Party!

SPOOKY HALLOWEEN SLIMES AND OOBLECKS

Glow In The Dark Oobleck

Slime and oobleck are perfect for Halloween and I have lots of it planned over our 31 days. To kick things off we are going to play with some glow in the dark oobleck that glows with or without black light!

Oobleck recipe that glows in the dark

Halloween Oobleck Spider Search Game

Take your oobleck to a whole different level with this variation that makes a fantastic Halloween party game. Halloween Oobleck with Spiders.

Halloween oobleck recipe with spiders, science and a great Halloween party game

Glow in the Dark Slime

We LOVED making this slime and it turned out perfect! Excellent for a Halloween party and the paint creates the fluffiest texture in the Glow in the Dark Slime.

Glow in the dark slime - an easy recipe with amazing results! Perfect for an after dark party or a fun new twist to sensory play time.

HALLOWEEN MATH STEM ACTIVITIES

Halloween Math Logic Puzzles

Introduce your students to a fun Sudoku style challenge with these Halloween themed Math Puzzles. A fun Halloween Math learning activity.

Halloween Math Logic Puzzles - Fun Halloween STEM Activities & Games

Halloween Math Measuring Pumpkin Circumference We don’t want to forget the M in STEM, so here’s an easy introduction to measurements using pumpkins.

Mummy Math Estimation – Mummy math fun!

Add some Art to your STEM and STEAM up Halloween

Halloween Art and Math Challenge

Combine a little art with lot of math as you complete these Halloween Line Art projects. We’ve also included some bonus writing prompt crafts making this the perfect project for a classroom.

Halloween Art and Math Project for the Classroom

3D Halloween Art Project

Explore depth and perspective as we move from 2 dimensions to 3 dimensions with the spooky 3D art project for Halloween.

Halloween STEAM Activity 3D Art Spooky Halloween Scene Tutorial

Halloween Pomander Project

In this heritage activity, kids create the most amazing smelling, and adorable pomanders. It builds fine motor skills, promotes creativity and is an incredible sensory experience (you NEED to smell these!!!). Make them with oranges or mini pumpkins for Halloween.

Pomander Project for Kids

FREE HALLOWEEN GAMES PRINTABLES

Spooky Halloween Tetris Printable

Spooky Tetris is a fun printable version of the game that has been shown to have significant cognitive benefits and may even help with healing from trauma. Check out this fun printable version for your kids.

Halloween Tetris Game for the Classroom

Join the STEAM Powered Family and get a FREE Halloween themed Maze and Word Search. Designed with a little extra challenge for your older kids.

Get a FREE Halloween Activity Printable

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    Includes a calendar with 31 Days of Halloween Activities, task cards, challenges, games and more.

    31 Days of Halloween Activities
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