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22 Halloween Science Experiments!

From icky slime to candy coatings, fake blood, wearable LEDs, a fire snake, and things that foam, light up, or glow in the dark, we have STEM suggestions for spooky, Halloween-themed science and engineering to explore with students!

22 Halloween STEM activities, including balloon car, lava lamp, and pumpkin veggie power
Update! This post has been updated for 2022!

Halloween Science and Engineering Projects!

Trick or treat! It's Halloween season! With its emphasis on the ghostly, the ghoulish, the gruesome, the spooky, the icky, and, of course, the sweet (to eat), Halloween brings an assortment of exciting themes to October. Science Buddies has science and engineering projects, activities, and lessons that tie in with Halloween and can make for great classroom, home, or independent science, technology, engineering, and math (STEM) learning opportunities. With a bit of trick-or-treat-inspired thinking, teachers can plan fun Halloween-themed activities for science class!

Here are some of our favorite Halloween-themed science and engineering experiments and activities to do with students at school or kids at home.

Free K-12 Halloween-themed Science Projects, STEM Activities, and Experiments

Try one of these 22 activities for hands-on science you can easily "dress up" for Halloween:

  1. How to Make Slime (Teachers! See also the Slime Shop: Engineer Your Own Slime lesson plan.)
  2. Electronics and Play Dough
  3. Candy Core Samples
  4. 3D Print with Sand: No 3D Printer Required!
  5. Build a Balloon Car (A lesson plan is available!)
  6. Make a Fire Snake
  7. Making Shadow Puppets
  8. Wearable Light-up STEM
  9. Mouthwatering Candy Melt
  10. The Physics of Fake Blood
  11. Explore Glow-in-the-Dark Water!
  12. Make a Lemon Volcano (See also these other foaming, fizzing, and bubbling ideas.)
  13. Candy Corn Geodesic Dome
  14. Make an Alka-Seltzer Powered Lava Lamp
  15. Building a Halloween Brushbot
  16. Halloween Robots
  17. Pumpkin Power
  18. Science Projects that Double as Halloween Costumes
  19. Candy Color Chromatography
  20. Colored Shadows
  21. DIY Light Up Unicorn Headband
  22. Build an Arduino Strobe Light for the Stroboscopic Effect

Do More!

For even more fun Halloween science project ideas, see: Spooktacular Halloween Science Projects.

In addition to our Halloween collections, you and your students may enjoy activities and experiments from these "wizardly" science collections:

Bookmark or pin one of our Halloween posts or projects for extra hands-on learning fun with students this Halloween!

Share Your Story!

What's your best Halloween-themed idea for hands-on science and engineering with students? We would love to hear how you tie Halloween in with your science class. Email us at blog@sciencebuddies.org to share your story!

Pin this collection:
Examples from 20 different Halloween STEM activities and experiments for spooky science fun, including lava lamp, balloon car, pumpkin power, and more

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