Climbing Powder River Pass westwards from near Ten Sleep is an exceptionally long, high-altitude journey across Wyoming's Bighorn Mountains. Prepare for approximately 25 miles of sustained climbing, gaining over 5000ft to the lofty 9666ft summit. Along the way you'll enjoy spectacular scenery transitioning from the dramatic cliffs of Ten Sleep Canyon (featuring steady ramps around 6-8%) to vast alpine plateaus, averaging around 4-5% overall. Services are virtually non-existent between Ten Sleep and the summit and don't forget to check WYDOT for current road status before attempting this cimb, which is seasonally closed due to snow in late April/early May, typically opening late May or June.