Halloween Activities

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 2020!

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!


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!


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

Halloween Skittles Experiment – Got lots of candy, no problem! Put it to great use with this 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.

Halloween Physics Balloon Races

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

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

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

Screaming Ghost Balloons – Creepy and fun activity! Explore sounds with this neat project.


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!

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 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!

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.

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.

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


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

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

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!

Layered Lollipops uses candy in a beautiful candy stem challenge


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. 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 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

Halloween Shooter Toys – A fantastic engineering challenge that is bound to be a huge hit.

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


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!

Fall Harvest Fruit Battery Circuit activity

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.

Halloween Brush Bots – Bring a little tech into your Halloween plans with this super cute bot.

Pumpkin Squishy Circuits – We did these last year and they were such a hit! The play dough does dry out though, so I’m going to do them close to the big day so they will be good to go for Halloween.

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

Glow Salt Circuits – Perfect for those longer nights these salt circuits are so easy to make but have big wow factor when you turn off the lights!

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)


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 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 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 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.

Pumpkin Geoboard Fun play with geoboards and 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


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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    Don’t miss out on our Bats and Cats Activity Pack!

    A printable pack of fun Halloween activities with a bat and cat theme

    Get more Halloween STEM Activities with STEAM Kids Halloween and save by bundling with the bestseller STEAM Kids.


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