Half Mile Road is a hiking, biking, and horse trail in Middlesex County, Massachusetts. It is within Middlesex Fells Reservoir and Middlesex Fells Reservation. It is 0.7 miles long and begins at 199 feet altitude. Traveling the entire trail is 1.3 miles with a total elevation gain of 115 feet. Near the trailhead there are wetlands. Along the trail there is a wetland.