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.
There is no statewide rule on sidewalk cycling — it is left to cities and counties in Washington. Washington's Revised Code RCW 46.61.755 makes cyclists generally subject to the rules of the road, but does not address sidewalk riding statewide. Cities and counties decide under their general police-power authority. Seattle Municipal Code § 11.44.120 expressly permits sidewalk riding so long as the rider operates in a careful manner, yields to pedestrians, and gives an audible signal before passing; Spokane and Tacoma similarly allow it outside posted business districts. Bellevue, Redmond, and several other Eastside cities restrict sidewalk riding in their downtown cores.
Because Washington 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.