Nelson Crag Trail is a hiking trail in Coös County, New Hampshire. It is within Nash Stream Forest, Mount Washington State Park, and White Mountain National Forest. It is three miles long and begins at 6,276 feet altitude. Traveling the entire trail is 6.3 miles with a total elevation gain of 3,841 feet. Mount Washington (elevation 6,289 feet) is near the trailhead. There are also parkings and a viewpoint. Along the trail there is parking.