The visitor center at Fossil Butte National Monument is open year-round. From May 1 to the Thursday before Memorial Day, and from late May to Labor Day, it’s open from 8:00 AM to 4:30 PM and 8:00 AM to 5:30 PM, respectively. During other times, hours may vary, generally between 8:00 AM and 4:30 PM.
There is no entrance fee to visit Fossil Butte National Monument. Admission is free for all visitors.
From Salt Lake City, take I-80 to Evanston, Wyoming, then Highway 189 to Kemmerer. West on Highway 30, follow signs to a fossil-rich haven.
Parking available at the visitor center, Historic Quarry trailhead, and Nature Trail & Picnic Area for cars, motorcycles, and smaller RVs. Larger RVs and trailers must turn around at the Nature Trail parking lot due to the steep gravel road ahead. No overnight parking. No parking fees.
Accessibility & permits
Emergency
- Cell service availability:Partial
Fossil Butte National Monument, situated in the vast expanse of southwest Wyoming, is a testament to the region’s rich paleontological heritage. This 50-million-year-old lake bed, now a high cold desert, is one of the world’s most prolific fossil sites, earning it the nickname “America’s Aquarium in Stone.” The monument’s limestone layers encapsulate a dynamic paleoecosystem that spanned two million years, offering an unparalleled glimpse into ancient life.
The landscape is dominated by sagebrush at lower elevations, while limber pine and aspen trees dot the slopes. Pronghorn, mule deer, and a variety of birds are common sights, with occasional appearances by moose, elk, and beaver. The visitor center, a Smithsonian-quality museum, showcases thousands of fossilized creatures, including 27 species of fish and 40 species of birds, set against the backdrop of a sea of sagebrush and aspen groves.
Hikers can explore interpretive trails that wind through this desert landscape, offering insights into the region’s ecological history. While there are no historic lodges or cabins within the monument, nearby Kemmerer provides a quaint base for exploration, with local outfitters offering guided tours and equipment rentals. During the summer, visitors can enjoy ranger-led programs and educational events that delve into the monument’s fossil treasures. For those seeking a more leisurely experience, the area’s serene beauty and the opportunity to uncover ancient secrets make Fossil Butte National Monument an irresistible destination for the discerning traveler.
- Area (mi²)
- 13
- Annual visitors
- 19 377
- Established year
- 1972
Top 3 Facts about Fossil Butte National Monument
The Green River Formation, exposed in this area, includes a section known as the Fossil Butte Member, which is about 200 to 260 feet thick and contains a diverse array of fossils, including fish, plants, and animals, preserved over 50 million years.
In this high cold desert, sagebrush dominates lower elevations, while limber pine and aspen thrive on the slopes. Pronghorn, mule deer, and over 90 bird species are common sights. Moose, elk, and beaver make occasional appearances. The landscape supports a non-venomous snake, a lizard, and rare amphibians. Fossil records reveal a rich Eocene lake community with delicate flowers, insects, and larger creatures like crocodiles and 20 species of fish. Contemporary flora includes willow, aspen, and pine groves around hidden springs and seeps. This ecosystem offers a unique blend of ancient and modern biodiversity.
In this high cold desert, sagebrush dominates the lower elevations, while limber pine and aspen thrive on the slopes. Summer daytime temperatures rarely exceed 90ºF, and the light-colored strata of the fossil-bearing Green River formation expose a stunning geological landscape. Pronghorn, Mule deer, and a variety of birds are commonly seen, adding to the rich biodiversity of this unique ecosystem.
Family programs
- Junior Ranger
- Ranger-led Tours
- Workshops & Hands-on Activities
- Scavenger Hunts (implied through interactive exhibits and fossil hunts)
- Volunteer & Stewardship (through Quarry Program participation)
Travel Tips
Plan Ahead
Plan a summer visit for ranger-led programs and fossil quarry events. Allow a few days to explore trails and scenic drives. Pack snacks and fluids, as options are limited. Start at the visitor center, then hike the Historic Quarry or Nature Trails, taking breaks at picnic areas.
Pack Appropriately
Pack layers for variable high-desert weather, sturdy hiking boots, and ample water. For camping, bring a tent, sleeping bag, and portable stove. Don’t forget headlamps, extra batteries, and sun protection. Check the season for specific gear needs.
Respect Wildlife
Respect the high cold desert ecosystem by staying on trails, avoiding sagebrush and limber pine, and keeping a safe distance from wildlife like pronghorn and mule deer. Be mindful of rare amphibians and reptiles, and avoid disturbing the habitat during sensitive seasons.
Stay Informed
Pack essentials like water, sunscreen, and bug spray. Watch for changing weather, steep trails, and wildlife. Stay informed about fire restrictions and contact park authorities for emergencies at 307-877-4455. Exercise caution near ledges and water. Bring snacks and stay hydrated.
Seasons
In spring, from May to the Thursday before Memorial Day, enjoy mild temperatures (50s-70s°F) and fewer crowds. Ranger programs and cooler weather make it ideal for hiking and wildlife viewing, with daily visitor center hours from 8:00 am – 4:30 pm. Perfect for an outdoorsy getaway.
Summer brings warm days under 90°F and cool nights below 50°F. Join the Quarry Program to hunt for fossils, and enjoy ranger programs, hikes, and public fossil preparations. Ideal for outdoor enthusiasts, but expect crowds. June to August.
Experience crisp autumn days from September to October, with temperatures in the 50s-70s°F. Enjoy cooler weather, fewer crowds, and ranger-led programs. Ideal for wildlife viewing and hiking, this season offers a serene and immersive experience.
Experience winter’s serene beauty from November to late May, with temperatures often below 32°F. Snowshoeing and cross-country skiing offer unique explorations amidst snowy landscapes and potential wildlife sightings, despite cold and sometimes stormy conditions.
Frequently Asked Questions
Ready to dive into what Fossil Butte National Monument has to offer? Let’s tackle some of the burning questions you might have as you plan your visit!
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The closest city to Fossil Butte National Monument is Kemmerer, Wyoming, located about nine miles to the east. Kemmerer is a small town in Lincoln County, Wyoming, and it is near the site of the ancient Fossil Lake.
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Dogs must be kept on a leash no longer than 6 feet at all times. They must also wear a collar with current tags, and owners must pick up after them. Failure to comply can result in heavy fines.
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You cannot park an RV directly within the monument, but there are nearby campgrounds that can accommodate RVs, such as the KOA campground about 40 miles away, which can handle RVs up to 80 feet in length. This campground offers various amenities and can support different types of motorhomes, camper vans, and trailers. Dispersed camping on BLM land is also an option, though it has limited services.
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Hike the Historic Quarry Trail, Fossil Butte Nature Trail, or other trails to explore the geology and scenery. Visit the Fossil Butte Visitor Center to see over 300 fossils, including a 13-foot crocodile and a mass die-off of 356 fish, and participate in interactive exhibits. During June through August, join ranger-led activities for a deeper understanding of the area’s natural history.