N.H. Rev. Stat. Ann. § 215-A:5-c

It is recognized that OHRV operation may be hazardous. Therefore, each person who drives or rides an OHRV accepts, as a matter of law, the dangers inherent in the sport, and shall not maintain an action against an owner, occupant, or lessee of land for any injuries which result from such inherent risks, dangers, or hazards. The categories of such risks, hazards, or dangers which the OHRV user assumes as a matter of law include, but are not limited to, the following: variations in terrain, trails, paths, or roads, surface or subsurface snow or ice conditions, bare spots, rocks, trees, stumps, and other forms of forest growth or debris, structures on the land, equipment not in use, pole lines, fences, and collisions with other operators or persons.