Orange County, CA Landscaping Rules: Grass Height Limits (2026)

There is no county aesthetic ordinance setting a maximum height for a watered, maintained residential lawn in unincorporated Orange County. The control on tall, dry, or overgrown vegetation comes through the OC Public Works / Agricultural Commissioner Weed Abatement Program, whose service is limited to the unincorporated area. The County's annual 'Notice to Destroy Weeds' directs owners to remove vegetation, litter, and other flammable material to ensure compliance with the Abatement of Hazardous Weeds provisions in Sections 14875 through 14922 of the California Health & Safety Code. Health & Safety Code 14875 defines 'weeds' to include grass and vegetation that is 'not pruned or otherwise neglected' so as to attain large growth and become a fire menace when dry, plus dry grass, stubble, brush, and litter that creates a fire hazard. The County program emphasizes 'maintaining weeds at ground level' to slow fire spread. For properties in State Responsibility Areas and high fire-hazard zones, California Public Resources Code 4291 / CAL FIRE guidance calls for cutting annual grasses and weeds to a maximum height of 4 inches. So the practical rule is fire-driven, not a cosmetic lawn-height code.