Southwest of Concord near Hillsborough, the Tri-County OHRV Trails (aka Hillsborough-Washington Trails) are a network of 45 miles of ATV trails. These trails are on private land and are maintained by the Tri-County OHRV Club.
Note: The State Of New Hampshire requires a NH state registration tag on every ATV. An out-of-state registration tag is not valid in NH. They will issue a fine if you try riding without a NH tag.
Note: As of November 2008, the existence of these trails could not be confirmed.
Overall, Tri-County OHRV/ATV Trails is the 14th most popular ATV riding trail of all 19 ATV trails in New Hampshire.