Halloween is a fun time to bring STEM activities into the classroom with building challenges, spooky science, coding, math, and hands-on problem solving.
These Halloween STEM activities use simple supplies and give kids opportunities to design, build, test, experiment, and improve their ideas. Choose one for a quick seasonal activity or set up several for an October STEM challenge.
Field: STEM, Engineering, Science, Math
Grades: K–5
Concepts: Engineering Design, Force and Motion, Problem Solving, Coding, Chemistry, Measurement
Free Halloween STEM Starter Guide
Want a few ready-to-go Halloween STEM ideas in one place?
🎃 Grab the free Halloween STEM Starter Guide with seasonal STEM challenges, science investigation pages, engineering planning sheets, and printable Halloween STEM kit toppers.
Favorite Halloween STEM Activities
Skeleton Bridge Challenge
Build and test a bridge using cotton swabs or other simple materials. Explore structure, stability, and how design changes affect strength.
Halloween Candy Catapult
Build a simple launcher and test force, distance, and design changes using plastic eyeballs, pom-poms, or another lightweight object.
Flying Bat Paper Airplane
Fold a bat-themed paper airplane and explore aerodynamics by changing the design and comparing how far or how straight it flies.
Ghostly Structures
Use lightweight materials to build the tallest freestanding ghost structure you can. Test the design, then improve it if it tips or collapses.
Halloween LEGO Challenges
Use seasonal building prompts to create pumpkins, ghosts, monsters, haunted structures, and other Halloween designs.
Halloween Coding Pictures
Add sequencing and coding to your Halloween STEM centers with simple themed coding activities.
Bubbling Cauldron
Mix up a bubbling Halloween reaction and explore what happens when common materials are combined.
Halloween Balloon Experiment
Use a simple chemical reaction to produce gas and inflate a Halloween balloon without blowing into it.
Halloween Engineering Challenges
Engineering challenges give kids a problem to solve rather than a finished project to copy.
Skeleton Bridge
Design and build a bridge, test its strength, and make changes to improve the structure.
Ghostly Structures
Create the tallest stable ghost structure possible using simple building materials.
Candy Corn Gears
Use candy corn to build and turn simple gears while exploring how gears transfer motion from one part to another.
Halloween Candy Catapult
Design a launcher and test how changes in the build affect launch distance.
Spider Web Challenge
Design a spider web using yarn, string, or other simple materials. Kids can compare different web shapes and structures.
Halloween LEGO Challenges
Create Halloween structures using seasonal building prompts and simple design constraints.
The original Halloween STEM cards already include challenges based around towers, spider webs, skeletons, and launching activities, so these fit naturally into this section rather than needing a separate post.
Use the Engineering Design Process
Encourage kids to work through a simple design cycle as they complete the challenges.
- Ask: What problem are you trying to solve?
- Imagine: What are some possible solutions?
- Plan: Sketch your idea and choose your materials.
- Create: Build your first design.
- Test: Does it work the way you expected?
- Improve: What could you change before testing again?
👉 Explore the Engineering Design Process here.
Printable Halloween STEM Challenge Cards
Use the printable Halloween STEM challenges for STEM centers, small groups, early finishers, or independent work.
Build a Cotton Swab Tower
Create the tallest stable tower possible using only cotton swabs.
Build a Spider Web
Design a web using yarn, string, felt, or other simple materials.
Build a Monster Tower
Create a tall freestanding structure and add a monster face to the top.
Build a Skeleton
Use cotton swabs, straws, or similar materials to design a skeleton that can stand on its own.
Launch an Eyeball
Build a catapult and test how far you can launch a lightweight Halloween object.
Pair the challenge cards with the planning pages in the Halloween STEM Starter Guide so kids can sketch, test, and improve their designs.
👉 Get the Free Halloween STEM Starter Guide
Halloween Physics Activities
Flying Bat Paper Airplane
Test aerodynamics and flight by comparing different folds and designs.
Halloween Candy Catapult
Explore force and motion by changing the catapult design and measuring launch distance.
Flying Tea Bag Ghosts
Investigate how warm air can cause a lightweight tea bag to rise.
Floating Ghost Drawing
Experiment with dry-erase drawings, water, and how materials interact at the surface.
Pumpkin Pulley
Explore how a simple machine can make lifting easier with a seasonal pumpkin twist.
👉 For even more experiments, visit Halloween Science Experiments for Kids.
Halloween Coding and Math
Halloween Coding Pictures
Practice sequencing and coding with seasonal picture activities.
Halloween Tangrams
Use geometric shapes to create spooky designs while building spatial reasoning skills.
Roll a Skeleton Math Game
Combine dice, counting, and a playful skeleton-building activity.
Halloween LEGO Challenges
Use building prompts to add measurement, counting, symmetry, and design to your brick bin.
Turn It Into a STEM Investigation
Take one activity further by adding something kids can test or measure.
- Bridge Test: Which bridge design holds the most weight?
- Catapult Test: Which design launches an object the farthest?
- Airplane Test: Which bat plane design flies the greatest distance?
- Structure Test: Which design can be built tallest without falling?
- Material Test: How does changing one material affect the result?
💡 Have students make a prediction, test the design, record what happened, and make one improvement.
Make a Halloween STEM Kit
The printable Halloween STEM kit toppers turn a few simple supplies into classroom kits, party activities, or take-home projects.
Bubbling Cauldron Kit
Pair simple reaction supplies with a themed topper for a ready-to-go chemistry activity. Use it with the Bubbling Brew Experiment.
Spider Web Geometry Kit
Use yarn, craft sticks, and spiders for a simple building and geometry challenge.
Candy Corn Catapult Kit
Add craft sticks and rubber bands for a compact force-and-motion challenge. Pair it with the Halloween Candy Catapult.
Skeleton Kit
Use cotton swabs or similar materials to create and assemble a simple skeleton model.
Haunted House Building Kit
Combine cardboard, craft sticks, and basic craft materials for a seasonal design challenge.
Ghostly Glider Kit
Provide simple materials for kids to build and test a Halloween-themed glider.
The free guide includes these STEM kit ideas and printable bag toppers.
🎃 Grab the free Halloween STEM Starter Guide with seasonal STEM challenges, science investigation pages, engineering planning sheets, and printable Halloween STEM kit toppers.
Halloween STEM for Different Grade Levels
Kindergarten–Grade 1
Keep the challenge simple. Focus on building, observing, describing, and trying again.
Grades 2–3
Add simple measurements, predictions, drawings, and comparisons.
Grades 4–5
Have students identify constraints, change one variable, collect data, and explain how they improved their design.
Get the Halloween STEM Pack
Want more Halloween activities ready to print and use?
The Halloween STEM Pack includes 150+ pages of science, STEM, engineering, math, games, and STEAM activities for grades K–5. You’ll find hands-on projects, skeleton challenges, brick activities, classroom extras, and artist-inspired Halloween projects all in one resource.
More to Explore
Halloween Science Experiments | Halloween Art Projects | Preschool Halloween Activities | Halloween Slime Recipes | Pumpkin Science Activities
7 Comments