Defensible space: the 5-foot, 30-foot, and 100-foot zones
Defensible space isn't clear-cutting your land. It's managing what's within 100 feet of the house so fire loses its path — and the first five feet matter most.
By the TMRW Team · Published September 2, 2026
The short answer
- California law (Public Resources Code 4291) requires 100 feet of defensible space around homes in the state's fire-hazard zones — it's the law, not a suggestion.
- The space is managed in zones: Zone 0 (0–5 ft): nothing combustible. Zone 1 (5–30 ft): lean and clean. Zone 2 (30–100 ft): reduced and spaced fuel.
- Done right it also pays: defensible-space compliance is on the Safer from Wildfires insurance-discount list, and it's among the first things an insurer's inspection checks.
The three zones at a glance
| Zone | Distance | What it means in practice |
|---|---|---|
| Zone 0 — ember-resistant | 0–5 ft from the walls | Nothing that burns: no mulch, shrubs, firewood, or combustible fences touching the house. Gravel, pavers, bare soil. |
| Zone 1 — lean, clean, green | 5–30 ft | Dead plants and leaves removed, tree branches 10 ft apart and away from the roof and chimney, wood piles moved out. |
| Zone 2 — reduced fuel | 30–100 ft | Grass mowed to 4 inches, spacing between trees and shrubs (more on slopes), fallen leaves and small branches thinned. |
Zone distances and requirements per CAL FIRE [1]. Slope, plant type, and local ordinances tighten these — some jurisdictions require more.
Why the first five feet decide the outcome
Post-fire damage research keeps finding the same thing: homes ignite from embers landing within a few feet of the structure far more often than from direct flame contact. A bark-mulch bed against the wall, a jute doormat, a shrub under a window — each is a fuse. Zone 0 exists because clearing that five-foot strip removes the fuse for almost no money, which is why it leads both CAL FIRE's guidance and the insurance industry's checklists.
Work outward from the house: Zone 0 first, then Zone 1's lean-and-clean, then Zone 2's spacing. The same order maximizes the insurance case — it's the order inspectors and underwriters weight. And keep dated photos: documentation is what converts the work into discounts and eligibility.
Common questions
This page is educational. TMRW is not an insurance agent, broker, or producer, and nothing here is insurance advice, a coverage recommendation, or an offer of insurance. Talk to a licensed agent or broker about your coverage.
Sources
- Defensible space zones and requirements (PRC 4291) — CAL FIRE / Ready for Wildfire, accessed 2026-09-02
- Safer from Wildfires: defensible space on the discount list — California Department of Insurance, accessed 2026-09-02
Keep reading
Home hardening: the upgrades that actually save houses
Most homes lost in wildfires ignite from embers, not the fire front. Home hardening is the fix: the upgrade list, rough costs, what insurers reward, and where to start.
Wildfire mitigation that insurers actually reward
Not all wildfire mitigation counts the same. The work that protects your home AND your insurability: hardening, defensible space, community programs — and the proof that makes it pay.
How to get off the California FAIR Plan
The step-by-step path off the California FAIR Plan: reduce your home's documented fire risk with the upgrades insurers must reward, prove it, and re-shop the regular market.