Solar Oven S'mores for Kids

There is something magical about making s'mores on a summer day.

Now, imagine making them without a campfire or any fire at all.

This solar s'more activity uses sunlight to melt chocolate and marshmallows inside a homemade solar oven. Kids get to build, observe, experiment, and enjoy a delicious treat at the end.

Part science experiment and part summer adventure, this activity transforms an ordinary pizza box into an exciting hands-on lesson about solar energy.

If your children enjoy hands-on activities, be sure to explore our Play Recipes for Kids collection for homemade slime, sensory fillers, chalk recipes, science activities, and more.

Supplies for Solar S'mores

For the Solar Oven

• Empty pizza box
• Aluminum foil
• Plastic wrap
• Tape
• Wooden skewer, stick, or ruler
• Box cutter or craft knife (adult use only)

For the S'mores

• Graham crackers
• Chocolate bars
• Marshmallows

How to Make a Solar Oven

Step 1

Carefully cut a large flap into the lid of the pizza box, leaving one side attached so it can open and close.

Step 2

Cover the underside of the flap with aluminum foil. The foil helps reflect sunlight into the box.

Step 3

Seal the opening with clear plastic wrap. This helps trap heat inside the oven.

Step 4

Line the inside bottom of the box with foil.

You can also add black construction paper to help absorb heat, but we found the oven worked well using foil alone.

How to Make Solar S'mores

Once the solar oven is assembled, it is time for the fun part.

Step 1

Place graham crackers, chocolate, and marshmallows inside the solar oven.

Step 2

Close the lid and prop the foil-covered flap open toward the sun.

Adjust the angle until sunlight reflects directly into the box.

Step 3

Wait and observe.

This is a great opportunity to encourage predictions and discussion.

What will melt first?

How hot do you think it will get inside the oven?

Step 4

After about 20 minutes, check your s'mores.

The marshmallows should be soft and the chocolate should be warm and melty.

Why Kids Love This Activity

This activity combines science, engineering, observation, and a favorite summer treat.

Kids love building the solar oven and checking on their s'mores throughout the experiment. There is something exciting about peeking inside the box and discovering that sunlight alone can melt chocolate and marshmallows.

The waiting becomes part of the fun as children make predictions, observe changes, and watch their treats slowly transform. And when the s'mores are finally ready, the warm, gooey reward makes the experience even sweeter.

The Science Behind Solar S'mores

Solar ovens work by capturing and trapping heat from the sun.

The foil reflects sunlight into the box while the plastic wrap helps hold warm air inside. As heat builds up, the temperature inside the oven rises enough to soften marshmallows and melt chocolate.

This activity is a simple and memorable introduction to solar energy, heat transfer, reflection, and insulation.

Looking for more ways to keep kids learning and exploring outdoors? Visit our Summer Activities for Kids collection for even more hands-on ideas.

Tips for Success

• Choose a bright sunny day.
• Position the foil flap so sunlight reflects directly into the box.
• Avoid opening the oven too often while the s'mores are heating.
• Start with smaller marshmallows if you want them to melt more quickly.
• Experiment with different treats and fillings.

More Science Activities to Try

Try These Next

If your kids enjoyed making solar s'mores, here are a few more hands-on activities that combine science, observation, and summer fun.

Ice Cream in a Bag

Turn simple ingredients into homemade ice cream while exploring how salt and ice work together to lower temperature and freeze a liquid into a delicious treat.

Rock Candy Science Experiment

Watch sparkling sugar crystals grow over time in this edible science activity that teaches patience, observation, and crystal formation.

Chalk Rockets

Launch homemade chalk rockets into the air with a colorful outdoor science activity that is perfect for warm-weather play.

Fireworks in a Jar

Create beautiful bursts of color inside a jar while exploring how oil and water interact in this simple summer science experiment.

Looking for even more hands-on activities? Explore our Play Recipes for Kids collection for homemade slime, sensory fillers, chalk recipes, science activities, paint recipes, and more.

Frequently Asked Questions

How long do solar s'mores take to make?

Most solar s'mores are ready in about 20 to 30 minutes on a sunny day.

Do I need a pizza box?

A pizza box works best, but other shallow cardboard boxes can also be used.

Can children build the solar oven themselves?

Children can help with most steps, but an adult should handle any cutting.

Why isn't my chocolate melting?

Cloud cover, cooler temperatures, or poor sunlight reflection can reduce the oven's effectiveness.

What does this activity teach?

Children learn about solar energy, heat transfer, reflection, insulation, and scientific observation.

☀️ Save this summer science activity for later!