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

Updated for Halloween 2020!

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 projects, activities, and lessons that tie in with Halloween and can make for great classroom, home, or independent science, technology, engineering, and math learning opportunities. With a bit of trick-or-treat-inspired thinking, teachers can plan fun Halloween-themed activities for science class!

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

Free K-12 Halloween-themed STEM projects, activities, and ideas

Try one of these 16 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. Balloon-Powered Car Challenge (A lesson plan is available!)
  5. Make a Fire Snake
  6. Mouthwatering Candy Melt
  7. The Physics of Fake Blood
  8. Explore Glow-in-the-Dark Water!
  9. Make a Lemon Volcano (See also these other foaming, fizzing, and bubbling ideas.)
  10. Candy Corn Geodesic Dome
  11. Make an Alka-Seltzer Powered Lava Lamp
  12. Building a Halloween Brushbot
  13. Halloween Robots
  14. Pumpkin Power Project
  15. Science Projects that Double as Halloween Costumes
  16. Candy Color Chromatography

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

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 to share your story!

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Examples from 16 different Halloween STEM activities

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