County guide

Zone 0 in Riverside County: what applies where

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

Which map you are on decides everything

Start with the maps: where the adopted state Zone 0 regulation applies depends on which one your parcel sits on. In the State Responsibility Area (SRA), land where the state holds financial responsibility for wildfire protection, it covers every hazard class, including Moderate and High, under Public Resources Code §4291. In the Local Responsibility Area (LRA), land protected by city and county agencies, it covers only Very High Fire Hazard Severity Zones (FHSZ), under Government Code §51182. That scope is settled; the timing is not, because the regulation is adopted and not yet in effect. Our guide Does Zone 0 apply to my home? walks through the logic.

Riverside County has a large SRA footprint. The OSFM/CAL FIRE map of the county's SRA hazard zones (June 15, 2023 version) tabulates it this way:

That is roughly 635,000 acres the rule will reach once it is effective, most of it Very High. Honesty note: the figures are from the June 2023 map version; final adopted figures could differ slightly.

On the LRA side, OSFM issued the county's updated 2025 hazard maps on March 24, 2025; local agencies must adopt them by ordinance within 120 days and, per the county fire department, "shall not decrease the FHSZ level recommended by OSFM." The Board of Supervisors approved a revised Ordinance No. 787 on June 10, 2025 to reflect the new maps. The county's LRA Very High zone now covers about 23,641 acres, more than double the 11,663 acres mapped in 2011.

Which communities are mapped Very High

We name only communities our research sourced. Precision matters, because High and Very High are different legal categories in the LRA.

Confirmed Very High: Idyllwild, Pine Cove, and Mountain Center in the San Jacinto Mountains, plus areas around Lake Hemet and Thomas Mountain.

Reported as "high or very high" (grouped, not individually confirmed): Lake Elsinore; parts of the City of Riverside, including homes ringing Sycamore Canyon Wilderness Park and the western border with Norco; and parts of Banning, Canyon Lake, Calimesa, French Valley, Mead Valley, Meadowbrook, Menifee, Moreno Valley, and Temescal Valley. News coverage of the county's map adoption grouped the two categories, so we cannot say which of these are Very High. In the City of Riverside alone, roughly 12,900 parcels are now in the two zones, up from about 2,700, per the city's fire marshal.

Do not rely on a community list; look up your parcel. Our check your address page shows how to read the official OSFM map for your property.

The local ordinance reality: no Zone 0 rule here

Six California jurisdictions adopted their own Zone 0 rules ahead of the state, and those are in force now: Moraga-Orinda Fire District, Ventura County Fire Protection District, Laguna Beach, Auburn, Berkeley, and San Diego. Riverside County is not one of them.

As of August 17, 2026, we found no adopted Zone 0 or ember-resistant-zone ordinance from Riverside County or from any city in the county. We checked the county fire department's hazard pages, the City of Riverside's pages, Menifee's fire-map pages, and Idyllwild Fire Protection District's ordinance; none contains one. Exact wording matters on two points:

• Ordinance No. 787 is not a Zone 0 rule. As reported, it covers hazard-zone designation, defensible space, building standards, and real-estate disclosure, not the 0–5 foot ember zone. Anyone saying the county "adopted Zone 0" in June 2025 is misreading it.
• MySafe:Riverside's Zone 0 explainer is education, not law. Its February 2025 primer is from an independent nonprofit, not a county agency, and describes the state rule, which was still in draft when it was written. It claims no Riverside-specific requirement, because none exists.

If a salesperson tells you Zone 0 is "already the law" in Riverside County, they are wrong. The statewide regulation was adopted on August 19, 2026 but is not in effect, and no local ordinance here fills the gap; the only rules in force today are the 100-foot requirements below. For the jurisdictions where local Zone 0 rules genuinely are in force, see our local ordinance roundup.

Your fire agency, and what actually gets inspected today

The Riverside County Fire Department operates in cooperation with CAL FIRE, serving the unincorporated county plus twenty contract "partner cities," including Temecula, Menifee, Moreno Valley, Lake Elsinore, and Indio. Nine cities run their own fire departments outside that system: Blythe, Calimesa, Canyon Lake, Cathedral City, Corona, Hemet, Murrieta, Palm Springs, and Riverside.

A couple of common claims deserve correction. The county has not "contracted with CAL FIRE since 1946": its own history page dates the relationship to 1921; 1946 is when the modern department took shape. And figures like "100 fire stations and 1,150 CAL FIRE firefighters" appear in no primary source we could load, so we do not repeat them as fact.

What is enforced today is vegetation and defensible space. The ember zone is not on the list:

• County Ordinance No. 695 (amended through 695.4) declares hazardous vegetation a public nuisance countywide and requires 100-foot clearance strips along roadways and around structures on adjacent improved parcels; the County Fire Chief may require more or less. The Fire Department's Hazard Reduction Office enforces it alongside Ordinance 772, and abating within 30 days of a Notice of Violation avoids further action.
• Homeowners in Very High zones must maintain 100 feet of defensible space around structures, per the county fire department.
• The City of Riverside adopted its own ordinance April 8, 2025: owners in mapped zones must keep a 100-foot perimeter clear, with annual notices, inspections about 30 days later, and a 10-day cure period before fines.
• Idyllwild Fire Protection District, an independent district, runs an annual abatement cycle under its Ordinance 01-19: self-inspection notice, district-wide inspection with 30 days to comply, follow-up with 14.

None of those programs touches the first five feet, or fences. That is what the state regulation adds once it takes effect. For existing homes, fences and gates sit in Phase 2: three years from an effective date that does not yet exist, or up to five on a local fire agency's schedule. Our timeline and enforcement guide covers the phases.

Local help with the work

Riverside County's fire safe councils offer real help, most of it vegetation-shaped:

• Mountain Communities Fire Safe Council (San Jacinto Mountains) has CAL FIRE grant funding to help landowners create defensible space and remove dead, dying, or diseased trees; field staff will visit your property to conduct an assessment (confirm terms with the council). Phone: (951) 659-6208.
• Southwest Riverside County Fire Safe Council runs a community brush collection and chipping program, high-visibility address signs, and education.
• MySafe:Riverside operates a wildfire safety assessment program countywide.

Be clear-eyed about scope: most fuels-reduction grants cover vegetation, not hardscape or fencing, and no California program currently pays for fence replacement statewide. Confirm with each council before you budget around it.

What this means for you

For a Riverside County homeowner, the honest sequence runs like this:

1. Find out which map you are on. SRA at any hazard class, or LRA Very High, means the adopted rule will reach you once it is effective. LRA High or Moderate means it will not. Start at check your address.
2. Handle what is enforceable now. The 100-foot defensible space rules are in force today, with real inspection cycles in the county system, the City of Riverside, and Idyllwild. Nothing about the first five feet is required of you in this county yet.
3. Walk your own first five feet anyway. The Board approved the rule on August 19, 2026, and staff have said it could become effective as early as September 2026 once the Office of Administrative Law finishes its review. Twenty minutes with our Zone 0 self-assessment and the Zone 0 checklist tells you whether you would have anything to do at all.
4. Do not panic-replace your fence. Nothing in force in Riverside County requires it, and the adopted regulation does not require wholesale replacement either. Board staff put it plainly:

The purpose of the regulations is not to require wholesale replacement of existing wood fences. Existing combustible fences may remain, repairs using existing materials may continue, and only where an attaching combustible gate exists or a fence is fully replaced would the applicable Zone 0 standards apply.

Board of Forestry staff, July 2026 memo to the Board

Where the regulation bites is the connection point: a fence or gate attached to the house, or within a foot of it, needs a five-foot noncombustible span at the structure once the rule is effective. 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 yet, so exact provision language is still pending. That targeted fix is covered in our five-foot transition guide, and the full picture is in the California Zone 0 fencing guide. As the package moves through Office of Administrative Law review, the status tracker will reflect it.