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

Solano County's County Code does not impose a fixed maximum lawn height (such as the 12-inch limits used in some California cities). Instead, overgrown grass is regulated through several overlapping authorities. Statewide, California Public Resources Code Section 4291 (administered by CAL FIRE) requires property owners in or near State Responsibility Areas - which include large portions of the unincorporated county outside the cities - to maintain 100 feet of defensible space around any structure, with grass cut short within the first 30-foot zone. Government Code Section 39561 et seq. authorizes counties to declare and abate weeds as a nuisance through hearing, notice, and lien recovery; Solano County implements this through code-enforcement procedures. The Solano County Agricultural Commissioner administers a Weed Management Area program that targets noxious weeds (yellow starthistle, perennial pepperweed, medusahead) rather than ornamental lawn height. Within city limits each city has its own grass and weed ordinances - Vacaville, Fairfield, and Vallejo all administer annual weed-abatement programs with set inspection seasons. Inside an HOA, CC&R landscaping standards (not the county) typically set the visible lawn height.