Nature & Science

Valley Forge National Historical Park encompasses an area of great historical significance, as well as a substantial area of native biodiversity. The 3,500-acre park is one of the few, large, contiguous, protected areas in southeastern Pennsylvania that has a variety of habitat types including a river, numerous streams and forested wetlands, eastern deciduous forest, and tall-grass meadows. The park is surrounded by residential, commercial and industrial developments of Montgomery and Chester Counties on all sides; it is an oasis for native wildlife.

Here are some helpful resources to enhance your visit to Valley Forge!

Birds of Valley Forge

Trees at Valley Forge Brochure (PDF)

Invasive Rusty Crayfish
Invasive Rusty Crayfish


The Crayfish Corps

In 2008, the rusty crayfish (Orconectes rusticus) invaded Valley Creek in Valley Forge National Historical Park. The rusty crayfish is a highly aggressive, non-native species that poses a significant threat to the continued health of the stream ecosystem.

Want to help?

Visit the Crayfish Corps webpage to learn more!

All ages are welcome and park staff will provide necessary training and equipment. Crayfish removal is accomplished using hand nets. Participants should be prepared to get in the stream and get wet.

Monarch butterfly on milkweed
Monarch Butterfly on Milkweed


Park Animals

Over 315 species of animals have been reported within the park. 225 of these are birds! Such impressive species diversity has been observed within the park because of the variety, sizes and spatial arrangements of habitat types, including deciduous forests, tall-grass meadows, wetlands, and riparian zones.

Pink Dogwood in bloom
Pink Dogwood in spring


Park Plants

The diversity of plant life that inhabits Valley Forge National Historical Park is directly related to the geology and hydrology of the area. Over 730 species of plants are known to occur within the park.


The white-tailed deer management plan can be viewed here.

Last updated: September 15, 2021

Contact the Park

Mailing Address:

1400 North Outer Line Drive
King of Prussia , PA 19406


610 783-1000

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