Watermelon Volcano Experiment
June 2, 2026
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This watermelon volcano experiment is a fun summer STEM activity for kids! Use a watermelon, baking soda, and vinegar to make an exploding watermelon volcano! Kids already love making volcanoes, so this unique twist is an exciting and engaging way to learn about science! So, if you’re looking for a STEAM activity, a volcano experiment, or a summer activity for kids, this is a great one to try.
And, if you’re looking for more fun STEM activities, try this playdough volcano or this LEGO STEM activity!
What You’ll Need For This Watermelon Volcano Experiment
Instructions For This Watermelon Volcano Experiment
Cut a watermelon in half and scoop out most of the fruit from the center, leaving a bowl-shaped shell.
Place the watermelon half onto a tray or inside a bin to catch the overflow.
Add baking soda into the hollowed-out watermelon.
Squeeze in a few drops of food coloring if desired.
Slowly pour or squirt vinegar into the watermelon.
Watch the bubbly eruption foam up and spill over the sides like a watermelon volcano erupting.
Keep adding more baking soda and vinegar to continue the experiment again and again. Kids can use squeeze bottles to control the fizzing action themselves.
Benefits Of This STEAM Activity
This watermelon volcano experiment is not only a fun activity for kids, it also:
- Introduces kids to simple chemical reactions in a fun, hands-on way
- Encourages curiosity, observation, and early STEM learning
- Strengthens fine motor skills while pouring and squeezing
- Provides rich sensory play with bubbles, fizzing sounds, and colorful foam
STEM Activities For Kids
Bee Pollination Experiment– Learn all about how bees pollinate with this fun STEM experiment! Kids will create a bee from popsicle sticks and pipe cleaners and “pollinate” different flowers.
Glow in the Dark Lava Lamp– Lava lamps were so popular when I was a kid, so of course I had to make a DIY glow in the dark one! It’s easy to make and so calming for kids!
Watermelon Volcano Experiment
This watermelon volcano experiment is the most fun summer science activity for kids! Easy to set up and a guaranteed wow factor for little scientists.
- Prep Time: 10
- Total Time: 20
- Category: Activities, DIY, STEM, Summer
- Method: Step-by-Step
Materials
● 1 watermelon
● Baking soda
● Vinegar
● Food coloring (optional)
● Knife and spoon
● Large tray or bin
● Squeeze bottle
Instructions
1. Cut a watermelon in half and scoop out most of the fruit from the center, leaving a bowl-shaped shell.
2. Place the watermelon half onto a tray or inside a bin to catch the overflow.
3. Add baking soda into the hollowed-out watermelon.
4. Squeeze in a few drops of food coloring if desired.
5. Slowly pour or squirt vinegar into the watermelon.
6. Watch the bubbly eruption foam up and spill over the sides like a watermelon volcano erupting.
7. Keep adding more baking soda and vinegar to continue the experiment again and again. Kids can use squeeze bottles to control the fizzing action themselves.
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