Pumpkins are perfect for more than carving and decorating. They also make great materials for science, engineering, math, and hands-on STEM activities all fall long.
These pumpkin STEM activities use real pumpkins, simple building supplies, and easy-to-set-up challenges for the classroom, homeschool, or home.
Start with the free Pumpkin STEM Activity Pack, which includes challenge cards, a science starter guide, and a pumpkin decomposition activity.
Field: STEM / Physical Science / Life Science
Grades: K–5
Concepts: engineering design, measurement, forces and motion, buoyancy, observation, problem-solving
Free Pumpkin STEM Activity Pack
Need an easy way to get started with pumpkin science and STEM?
Grab this free printable Pumpkin STEM Activity Pack to help you plan a few simple, hands-on pumpkin activities with minimal prep.
Inside you’ll find:
- Pumpkin STEM Challenge Cards for open-ended building and problem-solving
- Science Starter Guide to help kids observe, question, predict, and investigate
- Pumpkin Decomposition Activity for exploring how a real pumpkin changes over time
Use the printables for STEM centers, small groups, homeschool, or as a starting point for a larger pumpkin science and STEM unit.ct solution.
👉 Get the Free Pumpkin STEM Activity Pack
How to Use the Pumpkin STEM Challenges
The challenge cards give kids a problem to solve, not exact directions.
Kids can plan, build, test, and improve their ideas using simple materials. There isn’t one correct solution—the learning comes from trying an idea, seeing what happens, and deciding what to change.
👉 Learn more about the Engineering Design Process.
Real Pumpkin STEM Activities
Start with a few real pumpkins and see how many different ways you can investigate them.
Pumpkin Investigation
Observe, measure, make predictions, explore the inside, and count the seeds in a real pumpkin.
Pumpkin Math Activities
Measure circumference, height, weight, ribs, and seeds with free printable recording sheets.
Pumpkin Seed Investigation
Estimate how many seeds are inside a pumpkin, count them, and compare the results with other pumpkins.
Pumpkin Sink or Float
Make a prediction and test whether pumpkins of different sizes and shapes sink or float.
Rolling Pumpkins
Build ramps and investigate how ramp height, pumpkin size, shape, and surface affect motion.
Pumpkin Decomposition
Observe how a pumpkin changes over time and record signs of decomposition. A printable version of this investigation is included in the free Pumpkin STEM Activity Pack above.
Try a Simple Pumpkin Investigation
You can also combine several of these ideas into one investigation.
Have kids choose a pumpkin and:
- observe its shape, color, and texture
- measure its height and circumference
- count the ribs
- predict whether it will sink or float
- estimate how many seeds are inside
- open the pumpkin and investigate the parts
- count the seeds
- compare results with another pumpkin
This is an easy way to combine science, math, observation, and measurement in one activity.
Pumpkin Engineering Challenges
Pumpkins also make fantastic engineering materials. Give kids a problem to solve, provide a few basic supplies, and let them decide how to approach it.
Five Little Pumpkins STEM Challenge
Build a gate or structure that can hold five little pumpkins.
Pumpkin Pulley Challenge
Design a simple machine that can lift or move a mini pumpkin.
Pumpkin Catapult
Build a catapult, launch a lightweight pumpkin substitute, and measure the distance.
Pumpkin Geoboard
Turn a pumpkin into a hands-on geometry activity with shapes and patterns.
Pumpkin LEGO Building
Use a real pumpkin as the starting point for a LEGO building challenge.
Pumpkin Clock STEM Project
Explore how a simple battery works with a pumpkin and clock kit.
Extend the Engineering
Ask kids to draw their design before they build. After testing it, try questions like:
- What worked?
- What didn’t work as expected?
- What could you change?
- Which materials were most useful?
- How could you make the design stronger?
- What would you do differently if you tried again?
💡 These questions help turn a quick building activity into a more complete engineering investigation.
Pumpkin STEM Activities With Books
Want to add a literacy connection to your pumpkin STEM activities?
Try our Pumpkin STEM Activities With Books, which pair pumpkin-themed stories with simple building, engineering, and problem-solving challenges. It’s an easy way to combine read-aloud time with hands-on STEM.
👉 EXPLORE PUMPKIN STEM ACTIVITIES WITH BOOKS
Pumpkin Math and Measurement
Pumpkins naturally lend themselves to hands-on math. Try comparing several pumpkins and measure:
- height
- circumference
- weight
- number of ribs
- number of seeds
Then ask kids to organize their results from least to greatest or make a simple chart or graph.
👉 Use the free Pumpkin Math Worksheets to record the results.
You can also estimate the number of seeds before opening the pumpkin and compare the estimate with the actual total. For younger kids, count seeds by ones, twos, fives, or tens.
Pumpkin Science Activities for STEM
A few favorite pumpkin science experiments fit naturally into a larger STEM unit too.
Pumpkin Volcano
Use baking soda and vinegar to create a fizzy chemical reaction inside a pumpkin.
Pumpkin Oobleck
Explore the unusual behavior of a non-Newtonian fluid.
Real Pumpkin Slime
Mix up a seasonal polymer activity using a real pumpkin.
🔎 Want more experiments? Explore the full Pumpkin Science Experiments and Activities collection for chemistry, life science, decomposition, pumpkin anatomy, and more.
Pumpkin Worksheets and Printables
Add a printable when you want kids to record observations, label a diagram, or extend the activity.
Pumpkin Life Cycle
Explore how a pumpkin grows from seed to mature fruit.
Parts of a Pumpkin
Use a real pumpkin with a labeled diagram and worksheet to explore pumpkin anatomy.
Pumpkin Math Worksheets
Measure, estimate, count, and compare pumpkins.
Pumpkin Worksheets
Browse more printable pumpkin activities for science, math, and seasonal learning.
Pumpkin Coding Activity
Add the technology side of STEM with a simple screen-free coding challenge! Kids follow a visual algorithm step by step to draw a pumpkin while practicing sequencing and computational thinking.
This is an easy activity for a fall STEM center, early finisher, or pumpkin theme, and all you need is the printable and a pencil.
👉 Try it: Pumpkin Coding Activity: Draw a Pumpkin With an Algorithm
Add a Little Pumpkin STEAM
Want to add a creative extension? A few pumpkin art activities work well alongside STEM when kids explore pattern, texture, design, or process.
- Fizzy pumpkin painting
- black glue pumpkin
- Zentangle pumpkin
- 3D paper pumpkin
👉 See the full Pumpkin Art Projects for Kids collection for more ideas.
Guiding Questions
Use these questions during pumpkin STEM activities, science journals, or group discussions.
- What problem are you trying to solve?
- What do you predict will happen?
- What materials will you use?
- Why did you choose those materials?
- What happened when you tested your idea?
- What worked well?
- What would you change?
- How could you improve your design?
- What measurements could you collect?
- What did you notice about the pumpkin?
- Which parts of the activity used science?
- Which parts used engineering or math?
Pumpkin STEM for Different Ages
Preschool and early elementary: Focus on observing, predicting, measuring, counting, comparing, and building.
🔎 Good choices include pumpkin investigation, seed counting, pumpkin math, sink or float, rolling pumpkins, and the Five Little Pumpkins challenge.
Older elementary: Add data tables, graphs, repeated trials, controlled variables, written design plans, and redesign challenges.
💡 Ask kids not only what happened, but also why they think it happened.
👉 For younger learners, explore our Pumpkin Activities for Preschoolers.
Printable Pumpkin STEM Pack
Want your pumpkin activities organized and ready to print?
The Printable Pumpkin Projects Pack includes 100+ pages of pumpkin science, STEM, engineering, math, and art activities using easy-to-source materials.
Inside you’ll find:
- 15+ pumpkin science and STEM activities
- pumpkin observation pages
- pumpkin life cycle activities
- parts of a pumpkin resources
- pumpkin math activities
- sink-or-float investigations
- pumpkin oobleck
- pumpkin volcano
- engineering challenges
- pumpkin patch scavenger hunt
- pumpkin STEM story challenges
- pumpkin art projects
It’s an easy way to put together a non-Halloween pumpkin unit for fall.
GET THE PRINTABLE PUMPKIN PROJECTS PACK
More Pumpkin Activities
Pumpkin Science Experiments | Pumpkin Art Projects | Parts of a Pumpkin | Pumpkin Life Cycle | Pumpkin Investigation | Pumpkin Decomposition
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