I have been asked several times if it is legal to ride a bicycle on the sidewalk in California. Everyone I talked with thought they knew the answer, and everyone’s answer was different.
The short answer is yes, it is legal, but it depends where you are. There is no statewide law prohibiting it, but California Vehicle Code Section 21206 allows local governments to regulate operation of bicycles on public sidewalks. There are no restrictions against it in Los Altos. In the surrounding jurisdictions, Mountain View, Palo Alto and unincorporated Santa Clara County define restrictions, but Los Altos Hills does not.