Signal Ridge Trail is a hiking trail in Grafton County, New Hampshire. It is within White Mountain National Forest. It is 5.1 miles long and begins at 1,371 feet altitude. Traveling the entire trail is 10.3 miles with a total elevation gain of 3,784 feet. The Signal Ridge TH (elevation 1,378 feet) parking is near the trailhead. The trail ends near Mount Carrigain (elevation 4,665 feet).