Fox Forest, Hillsboro
The Fox Research and Demonstration Forest is located in Hillsborough.
At almost 1500 acres the forest hosts about 22 miles of trails and old dirt roads almost all of which are open to mountain bikes.
The best description of the fores is on the NH Division of Forests and Lands website.
It's a great place to ride with some very challenging singletrack.
There is a spring seasonal mud closure from March 1st to as late as May 23rd. Though most years the trails open earlier after they've dried out.
You'll enjoy riding here.