This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
The rule
There is no statewide rule on sidewalk cycling — it is left to cities and counties in California. No statewide rule. Cal. Veh. Code § 21206 expressly authorises cities and counties to regulate bicycle operation on sidewalks. San Francisco prohibits sidewalk riding by anyone aged 13 or older (S.F. Transp. Code § 7.2.12); Los Angeles permits it except where it endangers pedestrians; San Diego bans it in business districts. Always check the local municipal code. See Cal. Veh. Code § 21206 (local-regulation authority).
Because California doesn't set a statewide rule, the answer is "it depends on the city." Central business districts, downtown cores, and school zones are the most commonly restricted areas. Always check the local municipal code before you ride on a sidewalk.