County guide

Zone 0 in San Diego County: what applies where

Fact-checked August 19, 2026·Sources at the end of this article

Where the state rule reaches in this county

The statewide picture first: on August 19, 2026 the Board of Forestry approved the Zone 0 regulation. It is not in effect yet. The package goes to the Office of Administrative Law for review, including a five-day public comment period, and then to the Secretary of State for publication; staff have said the rules could become effective as early as September 2026 through emergency rulemaking. The content of the rule is settled, but no compliance clock is running, because every deadline in it keys off an effective date that does not exist yet. One caution on wording: the August 19 package in the board binder is the pre-meeting deliberative draft, and no certified "as adopted" text has been published, so exact provision language remains pending.

Coverage runs on two statutes. In State Responsibility Area (SRA), land where the state is financially responsible for wildfire protection, the regulation covers every hazard class. In Local Responsibility Area (LRA), only Very High Fire Hazard Severity Zones (FHSZ). The county's geography, per the Office of the State Fire Marshal's (OSFM) acreage table:

Add the covered rows: roughly 1.32 million acres. A Moderate-zone home in the SRA backcountry is covered; a High-zone home inside a city is not. Cities adopt the state's LRA zones by ordinance and may add area; the City of San Diego's map runs broader than the state's. Look up your parcel with our check-your-address walkthrough.

Which communities are mapped Very High

We name only communities whose Very High designation we verified from a primary source:

• City of San Diego: adopted the 2025 LRA FHSZ map by Ordinance O-21992 on July 29, 2025, effective August 30, 2025, adding areas beyond the state's recommendation.
• Del Mar: adopted the updated maps June 16, 2025; the city says the update "significantly expanded" its High and Very High zones.
• Poway: the city reports over 90% of its geography sits in an FHSZ, including Very High.
• Escondido: the city confirms the March 24, 2025 map places areas of Escondido in moderate, high, and very high zones.

Other cities almost certainly have Very High zones too; we have not verified them individually, so we will not list them. Go by your own address instead.

Local Zone 0 rules: what is actually adopted

Adopted and in force: City of San Diego. SDMC §512.0604 applies to all structures in a Very High FHSZ within city limits, reported (not independently verified) to cover roughly two-thirds of city residents. New structures have been covered since February 28, 2026; the existing-structure phase begins February 28, 2027, with the city asking owners to attempt full compliance, including fence and gate replacement where required, by February 28, 2029. The fence text, verbatim:

Where an existing fence or gate is attached and extends out perpendicular from the structure, a minimum 5-foot non-combustible transitional span is required. For fences outside of Zone 0, there are no changes or new requirements.

City of San Diego, Zone 0 Guidelines for Existing Structures (rev. 4/22/2026)

The guidelines also prohibit parallel combustible fencing in Zone 0 where it "creates a continuous fuel pathway," with exceptions for some existing vinyl at least 4 feet off the structure. But the city is more permissive on materials than the state: the adopted regulation defines noncombustible by the ASTM E136 test, and vinyl and fire-retardant treated wood setups that satisfy the city would not pass it. See our materials guide and our City of San Diego page.

Adopted, scope unverified: the unincorporated county. The 2026 County of San Diego Wildland-Urban Interface Code, which consolidates the ordinances of the 12 unincorporated County Fire Protection Districts, contains its own Zone 0 section, Sec. 604.12.1, the "Immediate Zone," 0–5 feet:

This zone shall be constructed of continuous hardscape or non-combustible materials... The use of mulch and other combustible materials shall be prohibited.

2026 County of San Diego Wildland-Urban Interface Code, Sec. 604.12.1

First reading February 10, 2026, adoption calendared March 3; the posted edition is captioned "Effective April 2, 2026." What we could not verify matters: whether Sec. 604.12.1 applies retroactively to existing homes or only to new construction and designated WUI areas. Do not treat it as a retrofit mandate until your fire protection district says so.

Everywhere else: nothing adopted that we could find. Contractor marketing often claims Zone 0 is "already the law" across San Diego County. As of August 16, 2026, it is not. We searched for Zone 0 retrofit ordinances in Escondido, San Marcos, Fallbrook, El Cajon, Chula Vista, Carlsbad, and Ramona and found none. Poway is explicit that Zone 0 for existing homes waits on state action: requirements "will be effective three years after they have been defined by the Legislature." A negative can never be fully proven (our local ordinance roundup tracks changes), but if someone says your Fallbrook or El Cajon home is under a Zone 0 mandate today, ask them to name the ordinance.

Who inspects: the county's fire agencies and programs

For the unincorporated area, the agency is San Diego County Fire (the San Diego County Fire Protection District), formed in 2008 from 15 rural fire agencies. It protects 1.5 million acres across over 40 communities, with 35 stations and more than 500 first responders, in county-owned stations staffed by CAL FIRE personnel on county funding. The state unit is the CAL FIRE San Diego Unit (the county directs residents to its El Cajon office).

The rule already enforced in the unincorporated area is the county's Defensible Space for Fire Protection Ordinance: no accumulation of combustible vegetation or other flammable materials within 100 feet of any improvement (the Fire Warden may authorize less, but no less than 30 feet). That is vegetation-clearance law for the outer zones. It is not a Zone 0 rule, and complying with it does not mean your first five feet would pass.

Also: San Diego Fire-Rescue offers a paid Home Risk Assessment ($163, since July 1, 2025) covering Zone 0, and Del Mar reminds sellers in High or Very High zones that AB 38 requires a documented defensible space inspection at sale.

Local help paying for the work

The Fire Safe Council of San Diego County supports more than 50 community councils (its claim: the most of any county) and runs a free, non-regulatory Home Assessment Program (current service areas: Crest, Bonita, Spring Valley, Fallbrook, and east Chula Vista), community chipping, and the Defensible Space Assistance Program (DSAP) for owners facing physical or economic barriers. Posted income limits: under $61,250 a year for a one-person household, $70,000 for two, $78,750 for three. Disabled and elderly applicants with financial barriers get priority; the Home Assessment Program comes first.

Be clear about what this money covers: brush clearance, tree trimming, and weed abatement. All of it is vegetation work. No California program currently pays for fence replacement as a standalone item statewide, and DSAP is no exception.

What this means for you

1. Find your layer. Look up your parcel's responsibility area and hazard zone; our address-check guide walks through the CAL FIRE/OSFM map. City of San Diego Very High zone: the city ordinance applies now. Unincorporated: ask your fire protection district about the 2026 WUI Code. Any other city: no local Zone 0 rule found, only the state regulation, adopted and awaiting Office of Administrative Law review.
2. Walk your own five feet. The Zone 0 self-assessment takes twenty minutes, and the printable checklist covers what inspectors look at: mulch, firewood, stored combustibles, and where your fence meets the house.
3. Triage the fence honestly. Under the adopted regulation, a fence attached to the house or within one foot of it will need a five-foot noncombustible span once the rule is effective; existing fences farther out may remain, and repairs may use combustible materials. Board staff wrote in July 2026 that "the purpose of the regulations is not to require wholesale replacement of existing wood fences." Nobody in Escondido or Ramona must replace a fence today; in the City of San Diego, attached perpendicular fences need the five-foot span as the phase arrives, 2027–2029. Full picture: our California Zone 0 fencing guide.
4. Document what you do. California insurers that price on wildfire risk have been required since 2022 to credit noncombustible fencing and gates within five feet of the home. That is a credit, not a requirement. Our insurance discounts guide covers getting the work recorded.

Watch the calendar: the vote is behind us, and the timing now rests with the Office of Administrative Law, which could clear the package for an effective date as early as September 2026. Fences for existing homes sit in Phase 2, a three-to-five-year runway that starts from that date (see the timeline and enforcement explainer). We track every development on the status tracker.