California law (Public Resources Code 4291) requires 100 feet of defensible space around structures in State Responsibility Areas and Very High Fire Hazard Severity Zones — or to the property line if closer. Zone 1 covers 0–30 feet and Zone 2 covers 30–100 feet. A stricter ember-resistant Zone 0 (0–5 feet) has been in development.
Requirements and deadlines vary by location and change over time. Confirm your property's status and requirements with your local fire authority or CAL FIRE.
The 100-Foot Rule
Public Resources Code 4291 requires homeowners in State Responsibility Areas and Very High Fire Hazard Severity Zones to maintain 100 feet of defensible space around their buildings, or to the property line if that is closer. Local fire authorities can require more, and they inspect properties and issue notices. In the Temecula Valley, many hillside, canyon and open-land parcels fall in these zones.
Zone 1: Lean, Clean and Green (0–30 feet)
- Remove all dead plants, grass and weeds
- Remove dead or dry leaves and pine needles from your yard, roof and rain gutters
- Trim trees regularly so branches are not within 10 feet of a chimney or the roof
- Limb trees up from the ground — remove lower branches to break fuel ladders
- Keep shrubs spaced and away from windows and vents
- Keep flammable furniture and stored items away from structures
Zone 2: Reduce Fuel (30–100 feet)
- Cut or mow annual grass down to a low height
- Create horizontal spacing between shrubs and trees
- Create vertical spacing between grass, shrubs and trees to eliminate ladder fuels
- Remove fallen leaves, needles, twigs, bark and cones
- Keep woodpiles away from structures
Zone 0: The Ember-Resistant Zone
A stricter rule for the first five feet around a structure — no combustible mulch, dry plants or stored items — was authorized by state law in 2020 and has been in development by the Board of Forestry and CAL FIRE, with timelines that have slipped. Check with your fire authority for the current status, and consider clearing this zone regardless: embers are what ignite most homes.
Where Trees Fit In
Defensible space is not about cutting every tree. Healthy, well-spaced, limbed-up trees can stay. The goal is to keep fire from climbing from ground fuels into the canopy and to keep tree crowns away from structures. Dead and dying trees, dense brush under trees and branches touching the roof are the problems.
Deadlines, Notices and Fines
Fire authorities inspect properties, typically in late spring and summer, and issue notices for non-compliance. Failure to comply can lead to fines and to the authority clearing the property at the owner's expense. Insurers are also increasingly asking about defensible space.
Cost and Scheduling
Typical Temecula Valley defensible-space work starts from about $600 for a small, light-fuel lot and runs to $6,500+ for larger, heavy-fuel properties. Book early — crews fill up ahead of inspection deadlines. See our defensible space service.
A Simple Annual Checklist
- Late winter: walk the property and identify dead brush and low limbs.
- Spring: cut grass and weeds before they dry out; limb up trees; remove deadwood.
- Early summer: clear roof and gutters; move woodpiles and flammable items.
- Late summer: recheck regrowth; remove any new dry material.
- After every wind event: clear debris that has blown onto the property.
Plants and Materials: What Helps and What Hurts
| Choice | Better | Avoid near structures |
|---|---|---|
| Ground cover | Succulents, low-growing irrigated ground covers | Dry annual grasses and dead plant litter |
| Shrubs | Well-spaced, irrigated, low-resin species | Dense chaparral shrubs, junipers |
| Trees | Spaced, limbed-up, healthy trees | Dead trees, palms with dry skirts, dense conifers close to the home |
| Mulch | Gravel, decomposed granite | Thick bark or wood chips within five feet |
| Structures | Ember-resistant vents, metal gutter guards | Wood decks with debris and stored items underneath |
What It Costs to Maintain Defensible Space
| Property | One-time clearing | Annual maintenance |
|---|---|---|
| Small suburban lot | $600–$1,550 | $300–$800 |
| Larger lot with hillside edge | $1,150–$3,900 | $600–$1,950 |
| Half-acre to one acre | $2,300–$6,500 | $1,150–$3,200 |
| Multi-acre or heavy fuel | $7,000+ | Custom |
Fire Season Preparation Checklist
- Confirm whether your property is in a State Responsibility Area or a Very High Fire Hazard Severity Zone.
- Walk 100 feet in every direction from the structure and note dry grass, dead shrubs and low limbs.
- Clear or trim to your fire authority's standard and haul away the debris.
- Clean roofs, gutters, vents and decks.
- Move firewood and flammable items away from structures.
- Keep photos and receipts for insurance.
- Re-check after wind events and heavy growth.
Working With Neighbors
Fire does not respect property lines. If a neighbor's overgrown lot threatens your defensible space, talk to them first and then contact your fire authority or code enforcement. You are responsible for your property; the authority can guide what can be done beyond it. Communities that coordinate clearance dramatically reduce shared risk.