Where this stands as of publication: approved by the Board, not yet law. On August 19, 2026, the California Board of Forestry and Fire Protection approved the final draft of its Zone 0 defensible space regulation, the first rule of its kind in the country. It still has to clear Office of Administrative Law review, including a five-day public comment period, before the Secretary of State publishes it. If you're reading this for a compliance deadline, confirm the current status with the Board directly before you act on it.
The regulation is officially called "Zone 0," though you'll see it written as "Zone Zero" almost as often, including in some of the Board's own press materials. Either way, it means the same thing: the five feet of ground touching a home or other structure. State fire officials built the rule around a specific, hard-learned finding from recent California wildfires. Most homes aren't lost to a wall of flame reaching them. They're lost to embers, thrown ahead of the fire by wind, landing in whatever combustible material happens to be sitting right against the building. You can do everything right at 30 feet and 100 feet and still lose the house if the first five feet are covered in mulch or pressed up against a wood fence.
The legal trail starts with Assembly Bill 3074 (Friedman), chaptered September 29, 2020, which amended Public Resources Code §4291 and told the Board of Forestry to write ember-resistant zone regulations. Senate Bill 504 in 2024 and Assembly Bill 1455 in 2025 amended it further. Then, in February 2025, Governor Newsom's Executive Order N-18-25 pushed the Board to move faster, issued in the immediate aftermath of that January's Los Angeles fires. From there it took more than 15 months of public workshops, site visits and comment periods to reach the final draft the Board approved this August.
What the Five-Foot Zone Actually Requires
The rule splits the zone into two bands.
- Non-combustible safety zone: The first foot out from the structure, or out to the edge of the eaves if that's farther, has to stay bare. No vegetation at all.
- Low-combustibility zone: The rest of the five feet. Well-maintained, non-woody plants are fine here, things like succulents and poppies, along with a maintained lawn, ground cover or potted plants in movable, non-combustible containers.
What's off-limits anywhere in the zone: bark mulch, wood chips, firewood, dead leaves, dead or dying vegetation of any kind. Gutters and roofs need to stay clear of debris too. A couple of specific clearances apply on top of that: nothing within two feet of a window, door or vent and nothing within five feet of an attached deck. Trees can stay, but they need real upkeep: branches ten feet from chimneys, five feet above the roof, clear of the eaves, no dead wood or ladder fuel hanging around underneath. New combustible fences and gates aren't allowed inside the zone going forward. An existing one can still be repaired, but eventually the last five feet where it meets the house needs a non-combustible section. Sheds and other outbuildings inside the zone need non-combustible roofs and walls too.
This applies to State Responsibility Areas and to Very High Fire Hazard Severity Zones inside Local Responsibility Areas, not the whole state. Local jurisdictions can also require something stricter, or approve an alternative way to comply, if their city council or county board signs off on it.
Timeline
The Board is giving this five years to phase in. In the early going, it's leaning on education rather than enforcement. New construction has to comply as soon as the regulation takes effect, no grace period there. For existing homes, the first three years are about the easier fixes: clearing combustible material out of the zone, cleaning gutters, pulling dead vegetation, trimming trees back. The harder, more expensive changes get a longer runway: rebuilding the under-eave safety zone, swapping out a combustible gate, bringing a shed into compliance, with local jurisdictions setting their own deadlines within that five-year window.
What This Means Beyond the Landscaping
Here's the part that doesn't show up in the Board's own materials, because it isn't really their problem to flag. It's ours. A Zone 0 retrofit is landscaping on the surface, but almost everything it touches sits right up against the building envelope. That's exactly where a rushed or well-meaning fix can quietly create a second, more expensive problem.
- 1. If you're a homeowner or property manager. Swapping mulch for gravel or decomposed granite looks like a weekend job, but grading is the part people skip. Heavy stone laid without checking the slope can send rainwater toward the foundation instead of away from it. And a mistake we see constantly: new hardscape gets laid right over the stucco weep screed, burying it, which traps moisture against the wall and starts rot behind the finish long before anyone notices.
- 2. If you're an architect or landscape architect. The detail that actually matters is the transition between the hardscape and the wall cladding. A capillary break between new paving and the envelope isn't optional. If a fence, deck or pergola now needs a non-combustible connection point to the wall, that has to be part of the design from the start, not something patched in once the framing's already up.
- 3. If you're a contractor or landscaper doing the actual work. Treat this as envelope-adjacent work, not just a landscaping scope. After any regrading, go back and check the weep clearances rather than assuming they're still fine. And while the crew is already out there, it's worth checking the vent screens near the zone against current ember-resistant mesh standards.
- 4. If you sit on an HOA board or manage commercial property. State fire regulations override conflicting architectural guidelines, full stop. Any CC&R or design standard that currently bans gravel, metal edging or non-wood fencing in front yards is going to need updating. Insurers are already weighing defensible space compliance into renewal decisions in high fire hazard areas. That raises the stakes for a board with a fiduciary duty to the association.
Zone 0 is a fire safety rule, but the work of complying with it runs straight through grading, drainage, cladding and the rest of the building envelope, territory a landscaping crew alone usually isn't equipped to evaluate. The compliance can be done correctly and the moisture problem can still get built in anyway. That's the kind of thing that doesn't surface until an inspection or a claim, months after the crew has already left. For the broader statutory framework, see our California Construction Law Guide.
This article is a general informational overview only. It is not legal advice and does not create an attorney-client or expert-client relationship. The regulation described here was approved by the Board of Forestry on August 19, 2026 and was not yet in effect as of this article's publication date. Confirm current status and applicability with the Board of Forestry and Fire Protection and with qualified counsel before acting.
