Photo: NPS Photo/Devin CherryFossil Butte National Monument preserves one of the world's most significant fossil sites, where a subtropical lake existed 50 million years ago in what is now high desert Wyoming. Families explore the ancient Green River Formation, home to perfectly preserved fossils of stingrays, early horses, and delicate insects that lived when this region enjoyed a warm, humid climate. The visitor center houses world-class specimens including complete fish fossils with every scale intact, while trails like the Historic Quarry Trail lead to actual fossil excavation sites. What sets Fossil Butte apart is the exceptional preservation quality—fossils here retain details like butterfly wing patterns and flower petals that typically decay within hours of death.
Junior Ranger Program at Fossil Butte National Monument
The Junior Ranger program at Fossil Butte transforms young visitors into fossil detectives through hands-on activities and guided exploration. Kids complete age-appropriate booklets while learning about paleontology, geology, and the incredible creatures that once lived in this ancient lake ecosystem.
- Examine real 50-million-year-old fossils up close in the visitor center
- Hike the Fossil Lake Trail to see actual fossil quarry sites
- Complete fossil-themed activities and earn an official Junior Ranger badge
Program Details
Best Ages for Fossil Butte National Monument
Ages 4–8
Young kids absolutely love the visitor center's fossil displays, especially the complete fish specimens that look like they died yesterday. The Junior Ranger activities focus on simple fossil identification and understanding how ancient animals lived, perfect for short attention spans. We recommend starting with the indoor exhibits before attempting any outdoor trails.
Ages 9–12
This age group truly connects with the detective work aspect of paleontology, using the visitor center exhibits to solve Junior Ranger mysteries about ancient life. Kids this age can handle the Historic Quarry Trail's 2.5-mile loop and appreciate seeing actual fossil excavation sites. The booklet activities match their developing reading skills and scientific curiosity perfectly.
Ages 13+
Teens and adults find the geological time concepts fascinating, especially learning how this high desert was once a lush subtropical paradise. The Junior Ranger program covers more complex topics like fossilization processes and ancient ecosystems that older kids can truly grasp. They often enjoy the longer trails like Rubey Point Trail for the panoramic views and geological interpretation.
Planning Your Visit
Getting There
The monument sits 9 miles west of Kemmerer, Wyoming on Highway 30—watch for the sign near mile post 44. The visitor center parking lot easily accommodates large RVs and vans with level spaces perfect for lunch breaks. No entrance fees make this an affordable family stop, though the remote location means planning fuel and supplies in Kemmerer.
Van & RV Notes
Our 22-foot high-roof Sprinter fits comfortably in the visitor center parking area with plenty of room to maneuver. The scenic drive's last 3 miles feature steep gravel roads not recommended for RVs or vehicles towing anything, but the first portion offers beautiful views suitable for all vehicles. No camping is available on-site, so plan overnight stays in nearby Kemmerer or at regional campgrounds.
Best Time to Visit
Late spring through early fall provides the best weather for outdoor trails, with summer temperatures reaching 60-90°F perfect for hiking. Winter visits focus on the heated visitor center's excellent fossil exhibits, making this a year-round educational destination. We love visiting in late spring when wildflowers bloom along the Nature Trail, creating beautiful contrast with the ancient landscape.
How Long to Spend
Plan a half-day visit to complete the Junior Ranger program and explore the visitor center exhibits thoroughly. Families wanting to hike multiple trails or take the scenic drive should budget a full day, especially if kids want to spend extra time studying the fossil displays.
Don't Miss
The visitor center's fossil fish wall displays some of the most perfectly preserved specimens you'll see anywhere—kids are amazed that 50-million-year-old fish still show individual scales and fin details. Walk the Historic Quarry Trail to see actual fossil excavation sites where paleontologists still make discoveries, giving families a real sense of ongoing scientific work.
Fun Facts for Kids
The fossils at Fossil Butte are so well preserved that scientists have found butterfly fossils with wing patterns still visible after 50 million years
When these fossils formed, crocodiles and early horses lived together in the lush forests surrounding the ancient lake
The fossil fish here died so quickly they were buried before scavengers could disturb them, preserving complete skeletons with every bone in place
More than 60 vertebrate species and over 100 plant species have been discovered in the Green River Formation rocks
Plan Your Stay
Save on park entry with the America the Beautiful Pass — $80 for unlimited access to all 400+ National Park sites for a full year.
Where to Stay
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Nearby Parks to Earn More Badges
Dinosaur National Monument
Dinosaur National Monument offers families hands-on fossil discovery experiences and petroglyphs spanning millions of years of natural history
Golden Spike National Historical Park
Golden Spike National Historical Park commemorates where the transcontinental railroad was completed, with replica locomotives and living history demonstrations
Timpanogos Cave National Monument
Timpanogos Cave National Monument features spectacular underground formations accessible via a challenging but rewarding 1.5-mile uphill hike
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