We love pumpkins, we love Fall, and we LOVE SCIENCE! These pumpkin science experiments and activities are a fun take on classic science experiments with a bit of a twist. What’s the twist? You add a pumpkin! Classic baking soda and vinegar, homemade slime, oobleck, bubbles and more!



Fall themed science is awesome, and pumpkin theme science lessons are perfect for this time of year. I love repeating simple science experiments with fun twists. Doing simple science activities with different themes really allows young kids to practice what they are learning in a fun way!

Check out our new list of PUMPKIN BOOK & ACTIVITY IDEAS

Below you will find easy pumpkin science experiments and pumpkin projects for kindergarten, preschool and early elementary.

The great thing about these science activities is that they use simple materials, most of which you will already have on hand! Science learning really doesn’t have to be difficult or expensive!

Grab a few pumpkins, big and small, and get ready for some hands-on fun and learning this Fall!


Click on all the links in orange or individual photos below to read all about set up and play!

Click here for your FREE printable Pumpkin STEM Activities

Pumpkin Slime

Kids love to play with slime and making slime is an awesome science experiment! Homemade slime is always fun especially when you make it inside a pumpkin.

YOU MAY ALSO LIKE: Orange Fluffy Slime

Pumpkin Volcano

Chemistry and pumpkins combine for a unique volcano science activity!

YOU MAY ALSO LIKE: Mini Pumpkin Volcano

Pumpkin Jack

I love the story about pumpkin Jack. If you are going to carve a pumpkin this year then you are already a good part of the way there to setting up your own rotting pumpkin science experiment.

Pumpkin Jack

Pumpkin Oobleck

Classic 2 ingredient Oobleck science experiment inside a pumpkin!

pumpkin oobleck

Lifecycle of a Pumpkin

Explore whether pumpkins sink or float, what are the parts of a pumpkin and more with these simple, fun preschool pumpkin activities.

ALSO CHECK OUT: Pumpkin Life Cycle Worksheets

preschool pumpkin activities

Crystal Pumpkins

Make your own crystal pumpkins with a fun twist on a classic borax crystal experiment.

Crystal Pumpkin experiment

Pumpkin Clock

Make your own clock using pumpkins to power it.  Really?  Yes, find out how you can make your own powered pumpkin clock.

Pumpkin Clock for Fall STEM Using Potato Clock Kit

Race Car Pumpkin STEM Activities

Add a pumpkin to your race track. Engineer a pumpkin tunnel or create a jump track for your cars.

pumpkin car race track


Click on each image below to enjoy pumpkin art and craft projects this season. Each pumpkin activity includes a free printable too! 


Click on the images below for more Fall theme science activities.



  1. What a great round-up of pumpkin science experiments. So fun! Thank you for sharing at Sharing Saturday and congratulations on being tied for most clicked this week!

  2. Thank you! There are so many fun ways to play and learn with pumpkins. Makes science extra cool this time of year.

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