North Twin Trail is a hiking trail in Grafton County, New Hampshire. It is within White Mountain National Forest. It is 5.3 miles long and begins at 1,844 feet altitude. Traveling the entire trail is 10.8 miles with a total elevation gain of 3,911 feet. The North Twin Trailhead (elevation 1,969 feet) parking is near the trailhead. North Twin Mountain (elevation 4,764 feet) can be seen along the trail. There is also a viewpoint along the trail. The trail ends near South Twin Mountain (elevation 4,892 feet).