Pumpkin Volcano: Fall Science

This fall preschool project for mini pumpkin volcanoes introduces the concept of chemistry and chemical reactions, encourages following instructions, and is a tad messy (so beware)!

So, what causes these mini pumpkin volcanoes to erupt: You’re mixing baking soda (a base) and vinegar (an acid) together which causes a chemical reaction. This reaction produces carbon dioxide (a colorless, odorless gas) which causes the eruption.


Dish soap
Baking soda
White vinegar
Food coloring: Orange, purple, green
Mini pumpkins
Large plastic lid or container


1. Carve out the top of each pumpkin.

2. Scoop out most of the insides (this doesn’t need to be perfect).

3. Bring pumpkins outside and set them on a lid or in a container.

4. Add a couple tablespoons of baking soda to each pumpkin.

5. Add a couple squirts of dish soap to each pumpkin.

6. Add one squirt of each color of food coloring to each pumpkin.

7. Start pouring vinegar into each pumpkin; you’ll likely need about 1/3 cup for each.

Watch your pumpkins erupt!

Note: You can rinse the pumpkins out and try this fall preschool project again and again! Trust us, your kids will request demand that you do so!