Craig Pass Closed for the Season; Mammoth to Norris Closed Sept. 14-30
The road linking West Thumb and Old Faithful is closed for the season—traffic should detour through West Thumb, Lake, and Canyon. The road from Mammoth to Norris is closed for two weeks—traffic should detour over Dunraven Pass. More »
Sylvan Pass Winter Status
Sylvan Pass Winter Travel
Some sources of the data include the following web sites:
Sylvan Pass may be temporarily closed to all travel when avalanche forecasting shows travel is unsafe. It will remain closed until forecast conditions permit Yellowstone National Park employees to conduct avalanche hazard mitigation operations and groom the route for motorized oversnow travel.
See Current Conditions and Updates for other related seasonal information.
Did You Know?
Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.