Grass Height Limits: Rohnert Park vs Sonoma
How do grass height limits rules compare between Rohnert Park, CA and Sonoma, CA?
Rohnert Park and Sonoma have similar restriction levels.
Rohnert Park, CA
Sonoma County
Sonoma County Code Chapter 13A requires grass on improved and unimproved parcels in unincorporated areas to be cut to 6 inches or less, with a stricter 4-inch limit within 10 feet of neighboring structures and along roadway frontage.
View full Rohnert Park rules →Sonoma, CA
Sonoma County
Within the Sonoma Valley Fire District jurisdiction (which includes the City of Sonoma), annual grasses must be cut to a maximum of 4 inches and maintained as defensible space out to 100 feet from any structure, mirroring California Public Resources Code § 4291 and Sonoma Valley Fire District (SVFRA) Annual Weed Abatement Regulations.
View full Sonoma rules →Key Facts Comparison
| Fact | Rohnert Park | Sonoma |
|---|---|---|
| Code Chapter | Sonoma County Code Ch. 13A (Ord. 6148) | - |
| Zone 1 Grass Limit | 6 inches or less | - |
| Roadway/Adjacent Structures Limit | Less than 4 inches | - |
| Tree Limb-Up | 6 feet from ground | - |
| First-Failure Cure Period | 30 calendar days | - |
| Maximum grass height | - | 4 inches (annual grasses) |
| Defensible space distance | - | 100 feet (Zones 1 & 2) |
| State authority | - | Cal. Pub. Res. Code § 4291 |
| Local authority | - | SMC § 14.10.045 |
| Cure period after notice | - | 30 calendar days |
| Enforcement agency | - | Sonoma Valley Fire District (SVFRA) |
Highlighted rows indicate differences between cities.
Rohnert Park FAQ
How short does my grass need to be in unincorporated Sonoma County?
Grass within 30 feet of structures must be cut to 6 inches or less. Along roadway frontage and within 10 feet of a neighbor's structure, it must be less than 4 inches.
Can I just scalp the lawn to bare soil?
No. Chapter 13A requires cutting but expressly prohibits cutting to bare soil because of erosion risk.
Who enforces this?
Permit Sonoma's Fire Prevention and Hazardous Materials Division and partnering local fire districts inspect properties under Chapter 13A.
Sonoma FAQ
Does the 4-inch rule apply to my irrigated front lawn?
No. PRC § 4291 and SVFRA regulations target dry annual grasses and wildland fuels. A green, irrigated ornamental lawn that is not adjacent to wildland vegetation is not the target of the mow-to-4-inches rule, though it is still subject to the City's water-efficient landscape rules in SMC Ch. 14.32.
What happens if I miss the abatement deadline?
SVFRA can hire a contractor to mow your property and bill you for the cost plus an administrative fee. If unpaid, the charge is recorded as a special assessment / lien against the property under Government Code §§ 38773.1-38773.5 and SMC § 14.10.045.
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