Humboldt County, CA Landscaping Rules: Weed Ordinances (2026)
Key Facts
- Fixed grass-height limit
- None in county code
- Nuisance authority
- HCC section 351 et seq. / Ord. 2457
- Defensible space
- PRC 4291 - 100 ft
- Compliance window
- 10 days from notice (HCC section 351-8)
Summary
Humboldt County does not impose a fixed grass-height limit (e.g., 6 or 12 inches) by ordinance in unincorporated areas. Instead, tall, dry vegetation can be abated as a public nuisance under Humboldt County Code section 351 et seq., and within State Responsibility Areas and Very High Fire Hazard Severity Zones, Public Resources Code section 4291 requires defensible space, which Cal Fire interprets as keeping annual grasses cut and dry vegetation removed within 30 feet of structures.
The board of supervisors, by ordinance, may establish a procedure for the abatement of a nuisance ... The owner or possessor of property shall receive notice and an opportunity to be heard before the abatement, except in the case of a nuisance that poses an immediate threat to public health or safety ... The cost of abatement, together with administrative costs, may be made a special assessment against the parcel ... and may be collected at the same time and in the same manner as ordinary county taxes are collected.
Full Breakdown
Unlike many cities, the Humboldt County Code does not state a specific maximum lawn or grass height for residential parcels. Tall, dead, or dry grass becomes enforceable in two main ways. First, under Humboldt County Code section 351 et seq. (Abatement of Public Nuisances) - as amended by Ordinance 2457 - any condition declared by state statute or county ordinance to be a nuisance can be ordered abated by the Code Enforcement Unit; vegetation that creates a fire, vermin, or sanitation hazard is routinely abated under this chapter.
Second, under California Public Resources Code section 4291, owners of structures in State Responsibility Areas (which cover most of unincorporated Humboldt County) must maintain 100 feet of defensible space, with the 5-30 foot 'lean, clean and green' zone meaning grasses are kept short and dry vegetation removed. State Government Code section 25845 confirms the county's authority to abate any nuisance by ordinance after notice and hearing, with cost recovery through special assessment or lien. Cal Fire and local fire-safe councils enforce defensible-space requirements seasonally; the county also relies on the Agricultural Commissioner for state-listed noxious weeds (Food & Agric. Code section 5004).
Violations & Fines
Under HCC section 351, the Code Enforcement Unit serves a Notice of Violation giving the owner 10 calendar days to commence abatement. Failure to comply allows the county to abate the nuisance and assess all costs - investigation, enforcement, and physical removal - against the property, recorded as a Notice of Nuisance Abatement Assessment Lien with the County Clerk-Recorder. Defensible-space violations under PRC 4291 are separately enforceable by Cal Fire.
Frequently Asked Questions
Is there a specific inches-of-grass limit in Humboldt County?
How long do I have to mow after I get a notice?
Does Cal Fire require lawns to be mowed?
Sources & Official References
Other rules in Humboldt County
How Humboldt County compares: Cities with the Strictest Weed and Property Maintenance Rules·California rules heatmap·Compare Humboldt County to another location·View the California landscaping rules overview
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