31 Days of Halloween STEM Activities and Projects

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Halloween STEM Activities to celebrate a 31 day countdown. Includes Halloween Science, Math STEM plus FREE printable activities!

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. Join us on our Halloween STEM adventure!

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I’ve gathered up 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, approximately 8 to 12 years old. Enjoy these spectacularly spooky STEM Halloween projects!

HALLOWEEN STEM ACTIVITIES

HALLOWEEN SCIENCE ACTIVITIES

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

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

Messy Brain Play – When I saw this activity I totally geeked out! It’s all brains and play and learning and just generally amazing awesomeness!

Ghost Bubbles Halloween Science – Such a fun and different twist on bubbles, perfect for Halloween.

Static Electricity Dancing Ghosts – Does anyone else have kids obsessed with static electricity? My boys love zapping each other. Funnel that enthusiasm into some learning with this great STEM activity.

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

Halloween Optical Illusions – Trick or treat? How about some tricks for your eyes with this illusion?

Spider Web Vibrations Science – Spiders are always popular at this time of year, so why not make a giant spider web and learn a bit about how spiders use vibrations?

Halloween Party Supplies from Steve Spangler Science! – Steve Spangler knows how to have fun with science at a party. He has some great kits here to make any Halloween party a big hit, from small to big crowds, he has you covered!

HALLOWEEN ENGINEERING

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

Ghostly Engineering Structures – Challenge young architects and engineers to create amazing structures.

Halloween STEM Activities Pumpkin Rockets – Launch your rockets with this quick and easy engineering challenge.

CANDY & EDIBLE HALLOWEEN SCIENCE

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

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

Dissolving Candy Pumpkins Science – There is always so much candy around at this time of year, use those sugary treats for learning!

Candy Pumpkin Engineering Challenge – Combine your engineering with some candy for a fun twist.

Spooking Pop Rocks Science – Pop rocks do some crazy things!

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

Halloween STEM Activities Candy Science Kit – Candy is a great addition to some science study with this innovative kit.

Skittles Density Rainbow – So pretty! A wonderful way to play with science and candy.

Layered Lollipops – Another beautiful layered density experiment with candy that smells and looks amazing!

HALLOWEEN TECH ACTIVITIES

Halloween Apps and Tech for a fun, educational, free and spooktacularly techy Halloween. I’m doing this right at the start of our Halloween countdown so they have all month to embrace the spooky tech.

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.

SENSORY SLIME AND OOBLECKS

Glowing 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 oobleck!

Spider Oobleck – Take your oobleck to a whole different level with this spidery variation.

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.

HALLOWEEN CHEMISTRY FUN

Self Inflating Ghosts – Fun with chemistry!

Ghost Pumpkin Eruption – This experiment is a spooky twist on the traditional volcano experiment.

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!

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.

Make A Glow In The Dark Lava Lamp – These are so much fun, my kids love it every time we do this activity.

BONUS! We just did this awesome Halloween Glow Milk Plastic Activity!

HALLOWEEN INSPIRED MATH STEM ACTIVITIES

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!