Cal. Pub. Res. Code § 4257

Any order which is issued pursuant to Section 4256 shall be published twice in at least one newspaper of general circulation in any county that is affected by the order. The publication shall be separated by a period of not less than one week and not more than two weeks. The order shall also be posted in such public places in each county as the director may direct, and along roads and trails which pass through the areas declared to be closed to camping or entry.