California Code, Fish and Game Code - FGC § 8277

(a) The director may extend the Dungeness crab season in any district or part thereof.

(b) Before extending the Dungeness crab season, the director shall consider written findings of the department regarding the state of the Dungeness crab resource in the district, or part thereof, which consider, but are not limited to, population and maturity. The director may extend the season only if the written findings do not conclude that the extension will damage the Dungeness crab resource.

(c) The director shall not extend the Dungeness crab season past August 31 in a district, or part thereof, north of the southern boundary of Mendocino County or past July 31 in a district, or part thereof, south of Mendocino County. The director shall order closure of the season at any time during the extension period if the director determines that further fishing will damage the Dungeness crab resource.