Best fire resistant fence for Zone 0: materials compared

This page compares ten materials on fire performance, cost, privacy and upkeep. It does not rank brands. No state agency approves or lists Zone 0 fence products, so the comparison is by material, and we sell nothing on this page.

What makes a fence fire resistant under the Zone 0 rule?

Under the rule, what matters is whether the material is noncombustible, and a “fire resistant” label does not settle that. The Board’s rule defines Noncombustible as “Materials that pass the American Society for Testing and Materials (ASTM) E136 test,” meeting Section 501.4.1 of the California Wildland-Urban Interface Code (14 CCR 1298.02(f); 1299.02(g)). It defines Combustible as “Vegetative, wood, or other materials that are likely to ignite and transmit flames in a wildfire.”

Section 501.4.1 also accepts a noncombustible base with a surface layer no thicker than 0.125 inch and a flame spread index of 50 or less under ASTM E84. A powder-coated or woodgrain-finished metal fence would rely on that exception. Our noncombustible materials guide explains the test in full.

Once the rule takes effect, any fence or gate attached to the house or within 1 foot of it “shall have a five (5) foot Noncombustible span from the point of attachment or the point closest” to the house (14 CCR 1298.04(b)(9)(A)). No new combustible fence is allowed within 5 feet (1298.04(b)(9)(B)). Fences more than 5 feet from the house are untouched. The full fence provisions are in our Zone 0 fence requirements guide.

Is the Zone 0 fence rule in effect?

No. The Board adopted the rule 8-0 on 19 August 2026 and filed it with the Office of Administrative Law on 28 August 2026 (file 2026-0828-03E). It withdrew the package on 8 September 2026, before OAL ruled. On 10 November 2026, OAL’s list of emergency regulations under review had no Board of Forestry entry.

Until OAL approves it, the rule is adopted but not in effect. Existing homes would then get 3 years in Local Responsibility Area Very High zones, or up to 5 on a local timeline (1298.04(c)(4)), and 5 years in the State Responsibility Area, or no less than 3 on a CAL FIRE timeline (1299.03(e)(4)). Some cities already have their own rules. San Diego’s Zone 0 Guidelines (Rev. 4/22/2026) apply to new structures since 28 February 2026 and target full compliance, fences and gates included, by 28 February 2029.

How do fence materials compare?

Two cautions on the cost column. The Fixr figures are national averages last updated 31 January 2025, not California quotes. Per-foot prices also mislead on a 5 foot job. At $70 a foot, 5 feet of aluminum would be $350, yet JJ’s Fence Company in San Diego County publishes $2,000 to $2,500 for a Zone 0 section with no gate and from $3,000 with one. Our Zone Zero cost guide covers the basis for each figure.

Is steel the best fire resistant fence?

It is one of the strongest choices. Fire Safe Marin says “Steel fencing, fiber cement, and noncombustible gate products are among the strongest options,” and that steel perimeter fencing “can reduce radiant heat exposure” and “provide added protection if a nearby building ignites.” NIST’s 2022 fence report did not test noncombustible fences but classes fences “made of noncombustible materials such as stone, brick, or steel” as low fire hazard. The IBHS Wildfire Prepared Home checklist lists steel and iron among acceptable materials within 5 feet of a home.

Fire Safe Marin notes that steel fencing comes in “a wide range of styles.” Fixr’s national installed range for steel is wide: $15 to $60 per foot.

Is aluminum as good as steel in a fire?

For the rule’s purposes, yes. The Aluminum Association reports that all the alloys it had tested to ASTM E136 in 2011 and 2020, including 6063, met the test criteria. Unalloyed aluminum melts at about 660 C (1220 F). The trade group points to past fires in which aluminum parts “had melted in the extreme temperatures but did not combust or otherwise contribute to the fires.” Details and the buyer’s checklist are in is aluminum noncombustible.

Aluminum fence is sold in the same styles as steel, including horizontal slat and woodgrain privacy panels. The woodgrain look is a surface finish, so the Section 501.4.1 surfacing exception applies. Ask for the finish’s E84 flame spread and thickness along with the E136 report for the metal.

Are block walls and masonry better than a metal fence?

A solid wall gives radiant heat protection that an open picket fence cannot. UC ANR says “Solid perimeter fences made of noncombustible materials (such as steel or concrete)” are “effective barriers against radiant energy exposure from fire fronts.” IBHS lists concrete, masonry and stone as acceptable within 5 feet of the home.

The trade-off is cost and permanence. Inch Calculator (updated 6 August 2023) puts concrete block walls at $15 to $20 per square foot installed. By our arithmetic, a 6 foot wall is 6 square feet per running foot, so roughly $90 to $120 per foot, before footings, finish or any engineering a taller wall needs. A wall also cannot swing open, so you still need a metal gate somewhere.

Is fiber cement fencing noncombustible?

It is widely treated that way. Fire Safe Marin calls fiber cement fencing “another strong choice” and notes it “is made of cement, sand, and cellulose fibers.” IBHS lists fiber cement as a noncombustible siding material. Because of the cellulose content, ask the maker for the specific product’s E136 result before relying on it in the 5 feet at the house.

Fire Safe Marin also warns that fiber cement boards “are typically thin” and that installers should “place intermediate supports as needed to avoid breakage.” The framing has to be noncombustible too if the fence sits inside Zone 0. We found no reliable published installed price.

Are chain link and hog wire fire resistant?

Chain link that is metal from top to bottom is noncombustible, and IBHS names chain link with aluminum, steel and iron as acceptable fencing. Fixr’s national installed price is $12.25 to $40 per foot in one table and $9 to $25 in another, both last updated 31 January 2025. It gives no privacy, and privacy slats added to it must be noncombustible too if they sit within 5 feet of the house.

Hog wire is a metal wire mesh, but the frame and posts decide whether the fence is combustible. Fire Safe Marin calls hog wire “a practical option for homeowners who want a more open look and do not need full privacy,” because the panels “do not create the same continuous combustible surface as a solid wood fence.” It also says “it is not recommended to use hogwire as a gate connecting to a structure, as it does not meet Zone 0 standards,” and that “the safest approach is still to use a noncombustible gate or noncombustible end section nearest the structure.”

Why don’t vinyl, composite and treated wood make the list?

Each of them is combustible, and the fire-safety sources say so directly.

• Vinyl. Fire Safe Marin: “Vinyl performs differently than wood, but it is also a combustible material.” UC ANR: “Vinyl fences would likely melt during fire conditions.” NIST rated vinyl privacy fences a medium hazard. In NIST’s tests a vinyl fence was hard to ignite on its own, but with mulch at its base the post, panel and frame blackened and distorted, and thin blackened pieces blew off, though NIST saw no firebrands. More in is vinyl fence fire resistant.
• Wood-plastic composite. NIST found “Rapid fire growth and large flames” for “one type of wood-plastic composite fence” and put certain composite fences in its very high hazard group.
• Fire-retardant-treated wood. The WUI Code counts it as one way to meet the ignition-resistant standard (Section 503.2.2). That category is broader than noncombustible, and the Zone 0 rule names wood in its definition of Combustible. San Diego allows new listed treated wood only for a fence running parallel to the house at least 4 feet away.

The IBHS checklist says: “Fire-resistant materials (e.g., vinyl, composite, or fire-rated coatings) are not permitted” within 5 feet of the home for its Wildfire Prepared Home designation.

Does “Zone 0 approved” on a fence product mean anything?

It is the seller’s own claim. Neither the rule nor the Board’s guidance sets up an approval, listing or certification program for Zone 0 fence products, so no agency stands behind a “Zone 0 approved” or “Zone 0 compliant” label. None of the fence sellers we reviewed in November 2026 published an ASTM E136 report for a specific fence product.

Before you buy, ask for:

1. An ASTM E136 report for the material, naming the product or alloy.
2. An ASTM E84 result and thickness for any coating or finish, so the Section 501.4.1 exception can be checked.
3. A parts list showing that every component in the first 5 feet, posts and filler panels included, is noncombustible.

Which fence should I choose for my situation?

Start with the first 5 feet, since the rest of an existing fence can stay under the state rule and can be repaired with the same material.

• Wood fence attached to the house. Replace the house-end section or gate with steel, aluminum or another noncombustible material. The Board’s guidance says: “Replace the first 5 feet of attached fences with metal or non-combustible materials.” Our Zone 0 gate requirements page covers the gate itself.
• Need privacy at the house. Solid steel, aluminum slat panels, masonry or fiber cement on metal framing.
• Want the strongest radiant heat barrier. A solid block wall or solid steel, per UC ANR.
• Want an open look on a budget. All-metal chain link, or hog wire in a metal frame with a metal gate at the house.
• Insurance discount. The California FAIR Plan’s discount list includes having “only noncombustible materials incorporated into any improvements to the property, including fences and gates, within 5 feet of the dwelling.” Vinyl or treated wood there won’t qualify.

Whatever you pick, the Board’s guidance adds one maintenance step: “Remove vegetation and combustible materials in contact with the fence.” NIST notes that debris piled at the base of a noncombustible fence can still carry fire.

What is still unknown about fence rules?

• When the state rule takes effect, and whether the Board changes the definition or fence wording before resubmitting it.
• How inspectors will treat coated metals under the Section 501.4.1 exception, and whether they will ask for E136 paperwork on common materials such as steel or block.
• Current California installed prices for fiber cement, hog wire and treated wood fencing. We found none we could trace to a dated source.