Blood Road is a hiking trail in Middlesex County, Massachusetts. It is within Mason Back 100, Unkety Brook Wildlife Management area, and Gamlin Crystal Spring Conservation Area. It is 1.5 miles long and begins at 246 feet altitude. Traveling the entire trail is 3.1 miles with a total elevation gain of 476 feet. The Unkety Brook Wildlife Management area and Mason Back 100 conservations can be seen along the trail. There are also wetlands and water along the trail.