Napa County adopted an ember resistant zone in May 2021, years ahead of the state. It reaches new construction in the unincorporated area only, and contains no fence provision at all.

Zone 0 in Napa County: a rule in force since 2021 that never mentions fences

Fact-checked August 20, 2026·Sources at the end of this article

Two sets of rules, and only one is in force today

Napa put an ember zone in its code years before the state adopted one, which is also why counting jurisdictions is a poor substitute for reading the text.

In force now: Napa County Code section 8.36.070, "Ember resistance zone," added by Ordinance No. 1467, section 2, adopted May 18, 2021. Section 6 of that ordinance says it takes effect "thirty (30) days from and after the date of its passage." No county page publishes the resulting calendar date, so we will not compute one for you. It is codified through Ordinance No. 1519 (April 28, 2026), and it belongs on our register of jurisdictions with rules in force.

Adopted, not yet in effect: the statewide regulation approved August 19, 2026, still awaiting Office of Administrative Law review and publication by the Secretary of State. No compliance clock is running; our timeline guide follows the rest of the process.

Three limits travel with the rule, and none is small print. Unincorporated area only, so it stops at every city line. New construction only, so no existing home owes it anything. And it says nothing about fences or gates. Napa has a Zone 0 and is not a fencing jurisdiction, the distinction our local ordinance tracker also draws for Moraga-Orinda.

Where the statewide rule will reach in this county

The regulation runs on two legal tracks Napa readers should never blur. In the State Responsibility Area (SRA, land where the state carries financial responsibility for wildfire protection) it works through Public Resources Code section 4291 and reaches every hazard class. In the Local Responsibility Area (LRA, city and district-protected land) it works through Government Code section 51182 and reaches only mapped Very High Fire Hazard Severity Zones. A Moderate-zone parcel in the SRA is inside the rule; a High-zone parcel in a city is outside it.

So once effective the state rule would reach all 361,709 SRA acres, and on the LRA side only 5,040. The Board of Supervisors adopted the State Fire Marshal's Napa map on May 20, 2025, though the county's own map page is stale and still says the Board "will adopt these new maps within 120 days." To place your parcel, start with our address lookup walkthrough.

What section 8.36.070 actually says

The operative text is two sentences long.

For all new construction where the construction commences on or after the effective date of this section, the establishment and maintenance of an ember resistant zone within five feet of a structure is required. Distances may be increased by the enforcement officer based on site-specific analysis of local conditions.

Napa County Code section 8.36.070 (Ord. No. 1467, section 2, 5-18-2021)

The definition at section 8.36.030 is where Napa parts company with California's strictest local rules: "'Ember Resistant Zone' means a noncombustible zone within five feet of a structure, using non-flammable landscaping materials and/or approved high-moisture-content annuals and perennials." Anyone telling a Napa homeowner the first five feet must be stripped to gravel is describing another jurisdiction's standard. Section 8.36.040 applies the chapter to "all unincorporated areas of the county," wider than the statewide LRA track because it does not turn on a Very High designation, narrower because it stops at city limits.

On fences the record is a set of zeroes rather than an argument. Counted programmatically on August 20, 2026: no occurrence of "fence" or "gate" anywhere in Chapter 8.36 as codified, and none in the adopted Guidelines, whose PDF carries a real text layer, so the zero is a finding and not an extraction failure. The county's self-inspection form has no fence item and no Zone 0 section at all, opening instead at "Zone 1: 30' From Structure."

The Guidelines are law here, and they mark the line themselves

Chapter 8.36 incorporates the Napa County Defensible Space Guidelines by reference and makes noncompliance a nuisance, so an 11-page May 2021 PDF carries legal weight here. Section D.7 repeats the code, requiring the ember resistant zone for new construction only. Then comes the sentence that should govern everything else a Napa homeowner reads. Section E opens: "Recommendations. For properties that are not subject to Requirement 7, above, the following additional fuel modification measures are recommended:". What follows is the familiar Zone 0 list, ending at "Use only inorganic, non-combustible mulches such as stone or gravel."

One in-force duty does reach existing structures, and it runs wider than five feet. Section D.1 requires owners to "Maintain a buffer by removing and clearing all prohibited materials, including Pyrophytic species, within 30 feet of each structure." The named species include chamise, manzanita, coyote brush, Monterey pine and California bay. If you are budgeting Napa fire work this year, that 30-foot list is the enforceable part.

What Napa adopted in December 2025, and one forecast that expired

Ordinance No. 1516, adopted December 9, 2025, brought in the 2025 California Fire Code and the 2025 California Wildland-Urban Interface Code. Chapter 15.13 adopts the WUI Code by reference "subject to any modifications set forth in this chapter," then adds no further sections: there are no local modifications. Ventura County's fire district took the opposite path, amending its adopted WUI code to insert a noncombustible Zone 0 with an express fencing requirement for new buildings. Napa took the state text as it stands, so do not read a fence rule into it.

A state case study dated August 17, 2022 described Napa's ordinance and predicted its expansion:

The ordinance became applicable immediately for new construction but gave existing property owners until 2023 to comply, when State Board of Forestry regulations take effect. The ordinance will be amended to include this additional requirement for existing properties then.

Governor's Office of Land Use and Climate Innovation, Napa County case study, August 17, 2022

None of that happened on that schedule. The Board of Forestry did not adopt until August 19, 2026, and section 8.36.070 as codified through April 2026 still begins "For all new construction."

The cities, the town, and one question we could not settle

No Napa city has a Zone 0 rule we could find. The City of Napa's operative instrument is Municipal Code Chapter 8.24, "Weed and Rubbish Abatement," which requires vegetation removal "by June 1st of every year" and contains no occurrence of "fence," "ember" or "five feet." American Canyon FPD's live rule is likewise weed abatement; its Zone 0 page cites no ordinance, carries no fence item, and repeats Napa Firewise's text word for word, making it a shared education script rather than a district standard. St. Helena runs weed abatement plus a voluntary, no-cost assessment.

Yountville is genuinely unresolved and we are leaving it that way. A full-corpus search of the Town's code on August 20, 2026 found no defensible-space, ember, wildland or weed-abatement provisions. Yet the county Fire Marshal's self-inspection form says Chapter 8.36 covers "the unincorporated areas of Napa County and the Town of Yountville," while section 8.36.040 reaches only unincorporated areas. Both cannot be true. If you own in Yountville, call 707-299-1464 and ask.

Who enforces, and what a notice costs

Enforcement runs through the Napa County Fire Department, staffed by CAL FIRE under contract. Section 8.36.090 gives an owner "fourteen calendar days from the date of the order of abatement to abate the nuisance," after which the county abates it and the cost becomes a lien collected with county taxes. An appeal goes to the fire chief within ten days, and "The decision of the fire chief is final." Section 8.36.200 adds that the county has no duty to issue an abatement order at all.

Selling is the other pressure point. Since July 1, 2021, a Napa property in a High or Very High zone needs documentation of a passed defensible space inspection under Chapter 8.36, dated within six months before the sales contract. The inspection is free. Our Zone 0 checklist follows what an inspector looks at.

The money here, and what none of it pays for

No Napa program names fences. Napa Firewise's Defensible Space Cost Share, funded by a CAL FIRE grant, was open on August 20, 2026 with no published closing date, so confirm before you commit money. Income-qualified residents "may receive up to 100% reimbursement, capped at $3,500," others 50 percent to the same cap. Priority goes to the greater Berryessa area, only first-time participants may join "until further notice," and eligible work is "defensible space within the 100 feet of structures, or 150 feet if the structures are on a slope." No fence line item, no hardscape line item.

The county's free Chipping Program, open April through October, tells participants that wood chips "must be kept at a distance of 100 feet from all structures," a program condition rather than something you can be cited under. County agreements with the Napa Communities Firewise Foundation fund outreach and fuel reduction, not resident reimbursements. The wider picture is in who pays for Zone 0 work, and the insurance side in our guide to fence insurance discounts.

The only fence sentence published anywhere in Napa that we could find is Napa Firewise's recommendation to "Upgrade the first 5 feet of fencing near the home to a noncombustible material." No ordinance is cited beside it, because there is none to cite.

Claims we could not verify

• The calendar effective date of section 8.36.070. Ordinance 1467 sets thirty days from passage, and passage was May 18, 2021, but no county page publishes the resulting date, and the only ordinance PDF the county serves is an unsigned pre-adoption draft. We cite Municode for operative text.
• Whether the county ember resistant zone binds property in the Town of Yountville. A county form says it does; the chapter's scope clause reaches only unincorporated land. Call 707-299-1464.
• Per-jurisdiction 2025 LRA acreage. The city-by-city breakdown rests on an OSFM file we could not reach. The county totals above are the only acreage we will publish.
• The City of Calistoga's rules. Its website could not be loaded by any method we tried. No finding either way.
• Current terms of the county's voluntary consulting inspection. No fee and no season appears on any live county page.
• The 2025 Pickett Fire. We saw a county headline and did not load the body, so we publish no figures.

What this means for you

• If your Napa house already exists, this ordinance does not require you to change your fence, or anything else in the first five feet. Anyone selling on that basis is wrong.
• Building new in the unincorporated county? The ember resistant zone is a permit condition. Plan it with your designer, remembering that it permits approved high-moisture-content annuals and perennials rather than bare ground.
• Spend on the 30 feet before the 5 feet. The pyrophytic clearance in Guidelines section D.1 is the duty that reaches your existing home.
• Want the fence work anyway? Do it on your own schedule. Read what the adopted state rule will ask in our fence requirements guide, compare aluminum, steel, wrought iron, chain link, masonry, concrete and stone in our guide to noncombustible fence materials, and walk your property with the Zone 0 self-assessment.

How often CAL FIRE inspects here

CAL FIRE has 679 parcels in Napa County in its defensible space inspection program in July 2026, the month the dashboard is currently reporting. Of the 679 inspected, 545 were compliant, which is 80 percent. 14 properties have already been found non-compliant more than once.

Two things this does not tell you. These counts cover inspections by CAL FIRE and Contract Counties inside the State Responsibility Area only, so work done by local fire agencies in the Local Responsibility Area is absent entirely. And none of these inspections is checking Zone 0: they are inspections against the defensible space rules in force today, which reach from the structure out to one hundred feet and contain no ember-resistant zone requirement. See the full inspection figures and what they mean, read from CAL FIRE's public dashboard on August 20, 2026.