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

Weed and vegetation rules in all-unincorporated Trinity County are about wildfire safety rather than lawn appearance. Because virtually the whole county lies within a CAL FIRE State Responsibility Area, California Public Resources Code section 4291 governs vegetation around buildings. PRC 4291 requires a person who owns, leases, controls, operates, or maintains a building or structure in an SRA to maintain defensible space of 100 feet from each side and from the front and rear of the structure (but not beyond the property line). CAL FIRE divides this into two zones — an intensive lean, clean, and green zone within the first 30 feet and a reduced-fuel zone from 30 to 100 feet — and its guidance directs that annual grasses and dead or dying grass be cut to a maximum height of about four inches, with dead plants, leaves, and combustible debris removed. Trinity County's transfer-site rules reinforce this by accepting clean brush for disposal but excluding noxious weeds such as Himalayan blackberry, yellow star thistle, and scotch broom, which residents are expected to manage rather than spread. The County also addresses overgrown, debris-laden parcels through its Title 8 nuisance framework, which is being strengthened in 2025. Penalties for failing to maintain defensible space are set by state law and enforced by CAL FIRE; local fire districts may add stricter standards. Residents should confirm current defensible-space requirements with CAL FIRE Trinity-Mendocino-Lake Unit or their local fire district before fire season.