Lake Forest, CA Fire Regulations: Brush Clearance (2026)

Lake Forest treats vegetation management as a core wildfire-safety requirement, administered by the Orange County Fire Authority (OCFA). Under the California Fire Code adopted in Municipal Code Chapter 8.24, weeds, grass, vines or other growth that is capable of being ignited and endangering property must be cut down and removed by the owner or occupant, and vegetation clearance in wildland-urban interface areas must comply with Part 7, the California Wildland-Urban Interface Code. OCFA's defensible-space standard is a 360-degree approach extending 100 feet from a structure or to the property line. Within that 100 feet, OCFA's homeowner guidance requires: removing dead and dying vegetation (including leaf litter on the roof); cutting grasses to about four inches and removing the cuttings annually; spacing shrubs over two feet tall in groups of no more than three, separated by three times the height of the tallest shrub and kept at least 15 feet from tree canopies; and providing about six feet of vertical separation between the ground (or lower plants) and the lowest tree branches. Combustible mulch is prohibited in the immediate zone next to structures, where non-combustible materials (gravel, decomposed granite) must be used. These rules carry the force of state law in the eastern foothills (Portola Hills, Foothill Ranch and adjacent areas), which CAL FIRE's 2025 maps place in Very High Fire Hazard Severity Zones, where Government Code 51182 requires 100 feet of defensible space (or to the property line).