N.H. Rev. Stat. Ann. § 417-A:4
No insurer, after a policy has been in effect for 60 days, or if a policy is a renewal, effective immediately, shall cancel a policy except for one or more of the following reasons:
Source. 1969, 487:1. 1990, 114:6, I. 2002, 207:17, eff. July 15, 2002. 2021, 147:2, eff. Sept. 21, 2021.