2020 New Hampshire winter frost/spring thaw laws and seasonal weight restrictions. See also:Tire chain laws. Tire chain laws by location. Trucking regulations. Federal bridge formula. Exemptions from seasonal restrictions. Page 1 of 11 By WLSADMIN on August 23, 2019 / Frost law restrictions. / Leave a comment Previous PostNevada frost law restrictions. Next Post New York frost law restrictions.