Napa County, CA Parking Rules: RV & Boat Parking (2026)

On private property, RV and boat parking in unincorporated Napa County is governed by the outdoor-storage and accessory-use provisions of Napa County Code Title 18 (Zoning). In residential zones (RC, RS, RM, RR), the typical rule is that personal RVs, trailers, and boats may be stored on the parcel behind the front-yard setback line - meaning not in the required front yard - and ideally in a side or rear yard or behind a screening fence. Larger vehicles and multiple RVs may trigger a use permit if the activity rises to commercial storage. In agricultural zones (AP, AW) and rural residential (RR), parking is more permissive because of the larger lot sizes, but RVs cannot be used as a second dwelling - that would be an unpermitted dwelling unit, regulated as an ADU/JADU under Sec. 18.104.180 (and impermissible in AP except as a JADU within an existing structure). Habitation of an RV is prohibited under California Health & Safety Code Section 17958 et seq. and Napa County standards, except in two narrow circumstances: (1) temporary on-site occupancy by a property owner during construction of a permitted single-family dwelling, typically authorized for up to 12 months by PBES; and (2) emergency or disaster shelter following a declared disaster (such as during wildfire recovery), pursuant to county emergency proclamations. After the 2017 Atlas, 2017 Tubbs, 2020 LNU Lightning Complex, and 2020 Glass Fires, Napa County issued temporary occupancy permits allowing fire survivors to live in RVs on their lots while rebuilding; the County has streamlined these processes. On public roads, Napa County Code Title 10 (Vehicles and Traffic) regulates parking, and California Vehicle Code Section 22651 authorizes towing of vehicles parked in violation of local rules. Section 22651(o) authorizes towing of vehicles parked or left standing on a highway for 72 or more consecutive hours - this 72-hour rule is the most common basis for removing RVs parked indefinitely on public roads in unincorporated areas. The Napa County Sheriff and CHP enforce these on unincorporated county roads; California Department of Transportation enforces on state highways (Hwy 29, Hwy 121, Hwy 128, Silverado Trail in places). Within incorporated cities (Napa, St. Helena, Calistoga, Yountville, American Canyon), each city has its own RV-parking ordinances that may impose tighter limits, including overnight parking bans on residential streets.