Brush Clearance: Altadena vs Pasadena
How do brush clearance rules compare between Altadena, CA and Pasadena, CA?
Altadena and Pasadena have similar restriction levels.
Altadena, CA
Los Angeles County
Altadena is largely in a Very High Fire Hazard Severity Zone. LA County Fire requires year-round brush clearance within 200 feet of any structure and 10 feet of combustible fences and roadways.
View full Altadena rules →Pasadena, CA
Los Angeles County
Pasadena enforces 100 ft defensible space per CA PRC 4291 in fire hazard zones. Zone 1 (0-30 ft) and Zone 2 (30-100 ft) requirements apply. Annual brush clearance inspections are conducted, especially critical after the 2025 Eaton Fire.
View full Pasadena rules →Key Facts Comparison
| Fact | Altadena | Pasadena |
|---|---|---|
| Defensible Space | 200 ft around structures | - |
| Fence/Driveway Clearance | 10 ft | - |
| Grass Height | ≤ 3 inches | - |
| Tree Limb Up | ≥ 6 ft above ground | - |
| Authority | LA County Fire Code Title 32 + PRC 4291 | - |
| Clearance | - | 100 ft defensible space |
| Zone 1 | - | 0-30 ft lean/clean/green |
| Zone 2 | - | 30-100 ft reduced vegetation |
| State Law | - | CA PRC 4291 |
Highlighted rows indicate differences between cities.
Altadena FAQ
How much brush clearance is required in Altadena?
200 feet of defensible space around any structure if you are in a Very High Fire Hazard Severity Zone, per LA County Fire and California PRC 4291.
Pasadena FAQ
How much brush clearance is required in Pasadena?
100 feet of defensible space around structures. Weeds must be cut to 3 inches. 10 feet of clearance along roads.
Does Pasadena apply fire retardant?
Yes. The Fire Department applies Phos-Chek to brush areas, particularly around the Arroyo, to prevent wildfires.
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