On September 30, North Carolina Governor Pat McCrory signed HB 373, the bill that moves the non-presidential primary from May to March, and moves the presidential primary from February to March.
As a result, candidates for partisan office (other than President) in the Republican, Democratic, and Libertarian Parties have a December 1 deadline to pay their filing fees and file a declaration of candidacy for a party primary. Thanks to FrontloadingHQ for this news.