Press Release Details Mud Season Arrives on New Hampshire Trails (Concord, NH – March 20, 2012) The New Hampshire Bureau of Trails wants to inform trail users that the early spring weather has created an early mud season on the trails. The Bureau is asking users to let the trails dry out before using them as they are very susceptible to damage this time of year. Off Highway Recreational Vehicle (OHRV) riders are reminded that trails do not open for riding until May 23rd. However, the Fremont Branch of the Rockingham Recreational Trail, as well as the Sugar River Trail and Ammonoosuc Recreational Trail are open for OHRV use year-round. Other state trails and club trail systems are closed at this time.