• Knightia eocaena mass mortality

    Fossil Butte

    National Monument Wyoming

Operating Hours & Seasons

Fossil Butte visitor center
Fossil Butte National Monument visitor center
NPS photo

Visitor Center Hours:
9 am-5:30 pm May-September, 7 days/week
8 am-4:30 pm October-November, 7 days/week, closed Thanksgiving Day
8 am-4:30 pm December-February, Tuesday-Saturday, closed holidays
8 am-4:30 pm March-April 7 days/week, closed holidays

Monument grounds are open sunrise to sunset. The entrance road gate is closed only during severe winter storms. The upper road accessing the picnic area, Nature Trail, and scenic drive closes November 1st until the snow melts, usually by late May.

Camping is not available.

Did You Know?

Knightia eocaena, NPS photo of Fossil Country Museum specimen

Knightia eocaena, a fossil fish, is the most abundant vertebrate fossil in the world and the state fossil of Wyoming.