Siskiyou County, CA Property Maintenance: Weeds & Overgrown Grass (2026)

Siskiyou County's vegetation rules are about fire safety and invasive species, not cosmetic lawn height. The County Code's fire chapter — the 'Siskiyou County Fire Control and Fire Hazard Regulations' (Title 3) — provides regulations for the maintenance of flammable materials, firebreaks, and the enforcement and abatement of fire hazards in the unincorporated area, and also governs burn permits. Separately, California Government Code section 51179 requires the County to designate moderate, high, and very high Fire Hazard Severity Zones by ordinance, which drives defensible-space expectations. The County's published code-enforcement materials do not state a specific grass or weed height that triggers a violation; overgrown flammable vegetation is instead addressed through the fire-hazard abatement framework. On the invasive-species side, the Siskiyou County Agriculture Department operates one of the largest noxious-weed control programs in the state, targeting noxious weeds that 'reduce livestock forage, displace native plant and animal species, and create fire hazards, increase soil erosion and cause economic losses to the agricultural industry.' Property owners should focus on clearing flammable brush and dead vegetation (defensible space) rather than a fixed mowing height, and should control state- and county-listed noxious weeds. Burning vegetation typically requires a permit under the fire regulations. For weed-abatement or defensible-space questions, contact the County Agriculture Department or local fire authority.