Glen Boulder Trail is a hiking trail in Coös County, New Hampshire. It is within Nash Stream Forest and White Mountain National Forest. It is 2.7 miles long and begins at 1,945 feet altitude. Traveling the entire trail is 5.7 miles with a total elevation gain of 3,378 feet. Near the trailhead there are parkings. Gulf Peak (elevation 4,774 feet) can be seen along the trail.