Fossil Butte National Monument

Visit Fossil Butte National Monument to learn all about an ancient world preserved in limestone!


Fossil Butte National Monument was established in 1972 and the site promotes the protection of the world-class paleontological heritage found in ancient Fossil Lake, which is part of the Green River Formation. This Eocene geologic formation provides a glimpse of ancient history from an estimated 52 million years ago.

At the Fossil Butte National Monument Visitor Center, interactive exhibits, video programs and over 300 fossils will help you understand the significance of this lake deposit and what it teaches us about the ancient world. Kids can become Junior Rangers and adults, Senior Rangers; visit the information desk for details. Fossil Butte National Monument also offers a Quarry Program during the summer where visitors can help hunt for fossils. However, fossils found at this site cannot be taken home. Those interested in digging for fossils they can keep should visit one of the private quarries

While at the monument, you should also make time to hike the Historic Quarry trail or the Nature Trail, take the scenic drive, and have lunch in the picnic area.

Hours & Visitor Info


Spring: 8:00am – 4:30pm daily
Summer: 8:00am – 5:30pm daily

For the most up-to-date hours, click here and view the Visitor Center info.




  • Open sunrise to sunset
  • Entrance gate may be closed during winter storms



Visiting this national monument is free.



Located nine miles west of Kemmerer, WY on US Highway 30.

864 Chicken Creek Road
Kemmerer, WY 83101

(307) 877-4455


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