Grass Height Limits: Petaluma vs Santa Rosa
How do grass height limits rules compare between Petaluma, CA and Santa Rosa, CA?
Petaluma and Santa Rosa have similar restriction levels.
Petaluma, CA
Sonoma County
Sonoma County does not set a numeric lawn height limit (e.g., '6 inches'). Instead, tall grass that creates a fire hazard is regulated under Chapter 13A (Hazardous Vegetation Abatement), and turf and irrigated grass area is capped on new and rehabilitated landscapes by the Water Efficient Landscape Regulations (County Code §7D3) under California MWELO.
View full Petaluma rules →Santa Rosa, CA
Sonoma County
Santa Rosa requires property owners to maintain vegetation and prevent overgrown conditions. Grass and weeds exceeding 12 inches are considered a nuisance subject to abatement.
View full Santa Rosa rules →Key Facts Comparison
| Fact | Petaluma | Santa Rosa |
|---|---|---|
| Fire-Hazard Rule | County Code Ch. 13A | - |
| Defensible Space | 100 ft (or to property line) | - |
| Turf Cap (MWELO) | ≤2,500 sq ft cool-season lawn | - |
| MWELO Effective Date | Oct. 4, 2022 (new landscapes) | - |
| Enforcement | Fire Warden / Permit Sonoma | Code Enforcement Division |
| First-Notice Cure | 30 calendar days | - |
| Maximum Height | - | 12 inches before citation |
| Fire Season | - | Stricter vegetation clearance |
| Abatement | - | City may clear and bill owner |
Highlighted rows indicate differences between cities.
Petaluma FAQ
Is there a maximum lawn height in Sonoma County?
Sonoma County does not set a specific inch limit on lawn height. Instead, dry or hazardous vegetation that creates a fire risk must be abated under County Code Chapter 13A, particularly within the 100-foot defensible space around structures.
How tall can my grass get before I am cited?
There is no fixed numerical trigger. The Fire Warden cites based on whether the vegetation is dry, combustible, and a fire hazard — usually after annual inspections that begin around June 1 when fire season is declared by the State Fire Marshal.
How big can a new lawn be in unincorporated Sonoma County?
For landscapes installed or rehabilitated after October 4, 2022, cool-season turf lawns are capped at 2,500 square feet per site unless the project demonstrates full MWELO compliance under Sonoma County Code §7D3.
What if my neighbor's grass is a fire hazard?
File a vegetation complaint with Permit Sonoma's Fire Prevention and Hazardous Materials Division. The Fire Warden investigates and can issue notices under Chapter 13A. Failure to comply leads to county abatement and a lien on the property.
Santa Rosa FAQ
How tall can grass grow before it's a violation in Santa Rosa?
Grass and weeds over 12 inches are considered a nuisance. During fire season, vegetation management near structures is especially enforced.
What happens if I don't mow my lawn?
Code Enforcement will issue a notice to abate. If you fail to comply, the city may clear the vegetation and charge you for the cost.
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