Ontario, CA Parking Rules: Loading Zones (2026)

Loading requirements in the unincorporated County are set by the Development Code rather than by a network of curbside loading-zone signs. Development Code Section 83.11.090(a) provides that 'Every institutional, commercial, industrial, or special use established or erected on land that abuts a street or an alley shall have one permanently maintained loading space of not less than 10 feet in width, 20 feet in length, and 14 feet clear in height, for each 5,000 square feet of structure floor area provided.' The same subsection caps the requirement: 'not more than four loading spaces shall be required for each use,' and allows an approved Use Permit to let adjoining uses share loading areas where appropriate. These off-street loading spaces must be improved to the same surfacing standards as parking areas (Section 83.11.090(b)-(d)), and Section 83.11.030(g) prohibits using required parking and loading areas for storage or display of merchandise. On the public street, curbside yellow curb markings indicate loading zones under California Vehicle Code Section 21458, which states that yellow means 'stopping only for the purpose of loading or unloading passengers or freight,' and white indicates short stops for loading or unloading passengers; the specific time limits are set by local ordinance and posting. For disabled loading and unloading, Development Code Section 83.11.060 details accessible loading-aisle dimensions tied to State law. Together these rules ensure deliveries occur off-street at larger sites while curb colors govern brief on-street loading.