Due to avalanche danger, all oversnow on the Sylvan Pass is prohibited.
Note: this means all travel. Snowmobile, snowcoach, skiing, snowshoeing. Doesn’t matter how lightly or heavily you’re traveling.
Currently, only National Park Service employees associated with or involved in avalanche forecasting/avalanche hazard mitigation operations may travel across the Sylvan Pass.
Indeed, until the avalanche danger passes, and until the route is regroomed to permit oversnow travel, Sylan Pass will be indefinitely closed.
Yellowstone spokesperson Sandy Snell-Dobert says it is not possible, at this time, to estimate when the Sylvan Pass will be open to oversnow travel again.
UPDATE: the Sylvan Pass is no longer closed.