• 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 Nov. holidays
8 am-4:30 pm December-March 22, Tuesday-Saturday, closed holidays
8 am-4:30 pm March 23-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, Chicken Creek Nature Trail (previously Fossil Lake Trail), and scenic drive closes November 1st until the snow melts, usually by late May.

Camping is not available.

Did You Know?

Diplomystus dentatus, NPS photo of Fossil Country Museum specimen

Railroad workers played a major role in the discovery of fossils from the Green River Formation. In the late 1860's, Union Pacific workers uncovered the first major fossil fish beds (Lake Gosiute) near the town of Green River, Wyoming.