N.H. Rev. Stat. Ann. § 210:23

The executive director of the fish and game department with the approval of the commission may declare an open season or closed season on any fur-bearing animals in any town and county in the state. The executive director may make such other rules as necessary as to lengthening or shortening the seasons, bag limits, reporting requirements, and the method and manner of taking, in accordance with RSA 541-A.