- Nestled in the Alpine Lakes Wilderness of Washington State, near I-90 & Snoqualmie Pass, Pratt Mountain is no stranger to visitors. However, with no clear “trail” to the mountaintop, and with definitive trails going to surrounding lakes and mountains, few people actually attempt to summit Pratt Mountain. To most easily reach the summit of Pratt Mountain, the route changes from a gentle-sloped woodland path to a Class 2 boulder-scramble. The hike is approximately 11-13 miles, roundtrip.