Hay Pass Trail is a hiking trail in Sublette County and Fremont County, Wyoming. It is within Fitzpatrick Wilderness Area and Bridger Wilderness Area. It is 11.7 miles long and begins at 9,799 feet altitude. Traveling the entire trail is 3.4 miles with a total elevation gain of 430 feet. Upper Golden Lake, Lake Louise, and another water can be seen along the trail.