Observing Autumn Leaves Preschool Unit

The fall season is an amazing time of year for observing colorful autumn leaves with preschoolers.  This simple science activity is an easy way to explore leaves with an indoor nature experiment. 

Observe autumn leaves with preschool science activities

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The changing colors of leaves on trees and plants are a clear indication that the fall season has arrived. There are many ways to enjoy the beautiful red and yellow leaves with early learners: nature walks; nature crafts; science activities.

  • Exploring natural materials supports awareness of the environment. Kids can observe weather conditions, animal habitats and signs of the seasons.
  • Nature crafts include a variety of textures, smells and colors that provide sensory experiences for kids.

 

Hands-on discovery in everyday play helps kids learn about the environment. The leaves that kids gather from the ground on a nature walk can be used in crafts and activities like this science experiment. Activities in nature engage all the senses, and provide valuable support for early childhood development.  

 

Observing autumn leaves 

 

This experiment helps kids observe and document changes in leaves.

We used red and yellow maple leaves in this activity but you can use any leaves available in your area.

 

Red and yellow maple leaves used in a preschool leaf science activity 

We are fortunate to live near a wooded area, which means we have a great supply of leaves! The trees are especially beautiful as the leaves change color in the fall.

These large maple leaves are perfect for this indoor experiment. 

 

Set up the experiment

For this activity you will need autumn leaves of similar size and type. We collected two yellow leaves and two red leaves for this experiment.

You will also need a two heavy books, and white paper for charting results.

Leaf science for preschool autumn activity

 

Conduct the experiment

Day 1

Place two leaves between the books. 

Place two leaves on a table or shelf in open air.

Allow the leaves to remain in place overnight.

 

Make a simple chart similar to the one in the photo to observe results.

Record the date or Day 1, the type of leaf used in the experiment, and the location of the leaves.

 

 

Leaf experiment autumn activity with preschoolers

 

Day 2


Remove the leaves from between the books.

Compare these leaves with the ones left in the open air overnight.

Return the two leaves to their place between the books.

Continue to observe the leaves for another day or two, placing the same leaves between two books overnight while the other leaves remain uncovered.

Preschool science with autumn leaves

 

Day 3

Place the leaves side by side to observe changes and differences.

 

Make observations

  • shape
  • color
  • texture
  • smell


1. Observe how the weight of the book prevented some leaves from curling up.

2. What would happen if you left the leaves pressed between the books uncovered overnight?

3. Can the curled leaves be flattened if placed between two books?

4. Do the leaves curl outside as they do inside?

 

Exploring properties of autumn leaves

 

Observing autumn leaves with preschoolers prompts lots of questions and open-ended discussions. 

Provide information and activities to your child at home, or the participants in your early learning program, according to interests and skill levels.

You can find lots of information online explaining why leaves change color and fall off the branches. Here are a few main points to consider.

 

1. Chemicals called pigments in the leaves of the trees give them their color.
                Chlorophyll gives leaves a green color.
                Carotenoids make leaves red, yellow and brown.

2. While leaves are green they make food for the tree, but when leaves receive less warmth from the sun as the weather cools, the chlorophyll in the leaves breaks down. Food becomes stored in the tree instead of in the leaves.

3. When there is not as much chlorophyll present in the leaves, the other colors, which have been there all along, now become more visible.

4. The tree creates a seal between itself and the leaf so the leaf can fall to the ground, sometimes with the help of wind and rain.

5. Since the tree is now storing food all winter, it will be stronger in the spring to grow new leaves.

6. When leaves fall off the tree, they crumble and mix with other plants and sun and water to become mulch to fertilize the ground around the tree.

 

The important outcome for this activity is experiencing nature, and learning to explore, observe, and discover.

The crunch of dried leaves, the weight of heavy books, and the exciting results of the experiment all stack up to make this a fun fall activity!

 

Fall Activities for Kids

Fall themed crafts and activities for kids

 

Observe any changes in appearance of the leaves.
1. Did either leaf change its shape or color?
2. Does either leaf feel or smell different?

 

What may have caused any changes in appearance?
Possible answers include:

1. The weight of the book flattened the leaf and prevented it from curling up.

2. The open air leaf dried up when its water evaporated.

3. Did the leaf curl because it was brought inside? Observe leaves outside, on the tree and on the ground.


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