Zone Zero
Zone Zero refers to the area extending 0–5 feet immediately surrounding a structure and is considered one of the most critical zones for wildfire mitigation. Research shows that most homes lost during wildfires ignite due to wind driven embers rather than direct flame contact.
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These embers can travel long distances ahead of a fire, bypass fuel breaks, and accumulate in vulnerable features such as vents, decks, gutters, door thresholds, and combustible materials located next to buildings. When ignited, these materials can provide a direct pathway for fire to spread to the structure.​
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Wildfire science and post fire investigations consistently demonstrate that reducing or eliminating combustible materials within this narrow perimeter significantly lowers ignition risk. Zone Zero is therefore designed to serve as the final barrier against ember driven ignition by emphasizing noncombustible or ignition resistant surfaces and regular maintenance. While broader defensible space and home hardening measures remain important, evidence suggests that mitigation closest to the structure often provides the greatest reduction in wildfire vulnerability relative to its small footprint.

Zone Zero:
CA Draft Regulations
Attention Santa Monica Mountain’s Residents:
The state is currently in the process of finalizing details of the new Zone Zero laws. The initial bill to create an ember-resistant zone within the first 5 ft of the structure was passed in 2020.
There is ongoing discussion on trees, ground cover, and shrubs. ​​​​​Due to the complex nature of this decision, the timeline has been extended. To share your support for the finalization of the science-based version of the codes, please submit a public comment with the email template provided below.
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Learn more at The Board of Forestry Website and Zone 0 FAQs.
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Submit Public Comments to: PublicComments@bof.ca.gov Template email: Subject: Political influence over the Committee work Dear Zone 0 Advisory Committee Members, I am writing to express my deep concern that political pressure may be applied to the Committee in ways that will severely delay or altogether halt its work. The testimony by firefighters and wildfire scientists presented to the Committee has been overwhelmingly consistent in favor of strict Zone 0 options. Opposing testimony has not provided peer-reviewed scientific evidence, or has misunderstood the regulations, which will not require significant tree removal. Nonetheless, the Committee is faced with great pressure that may be difficult to resist. Yet, without strong regulations issues by the Board of Forestry (BoF), few if any local jurisdictions in the LRA will be able to research and assemble, on their own, adequate WUI wildfire regulations. It is with great empathy for your position that we suggest splitting the issue into parallel paths. We strongly urge the Board to promptly move forward with a strictly science-based version of the regulation while also providing additional time to study the problem of implementation at the local level. Providing certainty regarding the standard and also more time for locally developed implementation strategies that meet community-specific mitigation needs addresses the competing imperatives the Board and our state currently faces: local jurisdictions will still be able to adopt them now if they have the will; In the next five years, it will become clear if there is a difference in wildfire impact between those local jurisdictions that have adopted these regulations, and those (the large majority) that have not—we are certain there will be; it will also become clear if the adoption of the BoF-issued regulations has consequences on the availability and the cost of insurance—we are certain there will be. There cannot be reasonable disagreement with this option by opponents of the BoF’s Zone 0 direction, since AB1455 gives local jurisdictions the ability to self-certify their own alternative measures, making them able to forever avoid adoption the BoF’s standard regulations. We understand the pressure you are under: thank you for your tenacious leadership! The Board’s role is to establish the standard, not implement it. Local agencies will continue to be held in a state of uncertainty so long as the Board’s position on the standard remains in flux. Sincerely, [Your Full Name] [Address] [email] [phone number]
NEXT MEETING: April 23, 2026 at Calabasas Community Center
Zone Zero Resources
We understand the intricate nature of wildfire and how a lot depends on the factors and characteristics at any given point in time. There are instances where green vegetation can act as a buffer and there are instances were it acts as a pathway of fire. However, research from the 2025 LA Fires revealed "when Zone 0 fuel coverage exceeded 25%, the likelihood of damage or destruction increased to 87-100%" (IBHS, 2025).
2025
Insurance Institute for Business & Home Safety
The 2025 Conflagrations Full Report
"The Palisades and Eaton Fires raged through Los Angeles County neighborhoods, creating catastrophic conflagration. More than 16,000 structures were destroyed in the fires, which now rank as two of California’s three most destructive fires on record. In the days following the conflagration, the Insurance Institute for Business & Home Safety (IBHS) deployed teams to study the damage and further advance the understanding of how fire spreads into and through communities" ( IBHS, 2025).
2025
UC Berkeley
After devastating LA fires, California is drafting nation's toughest rules for homes
"The idea, called Zone Zero, is to prevent plants and flammable items from igniting during a wildfire, spreading flames to the house and the surrounding neighborhood. In high winds, most homes burn down due to embers, the tiny bits of burning debris carried by the wind. Still, the pushback has been strong, even in the Los Angeles area neighborhoods where so many lost homes. In public meetings, homeowners have voiced concerns about losing greenery and shade, as well as the cost of clearing the vegetation" ( Sommer, 2026).
2025
Federal Emergency Management Agency
"The purpose of this document is to provide recommendations to homeowners for pre-wildfire measures to help reduce the risk of smoke damage and do-it-yourself (DIY) steps that homeowners can take to remediate light to moderate smoke damage. This document also includes recommendations for selecting and monitoring a professional cleaning services contractor for heavy smoke damage." ( FEMA, 2025)
2025
International Journal of Wildland Fire
The role of defensible space for residential structure protection during wildfires
"With the potential for worsening fire conditions, discussion is escalating over how to best reduce effects on urban communities. A widely supported strategy is the creation of defensible space immediately surrounding homes and other structures....We analysed the role of defensible space by mapping and measuring a suite of variables on modern pre-fire aerial photography for 1000 destroyed and 1000 surviving structures for all fires where homes burned from 2001 to 2010 in San Diego County, CA, USA." (Syphard, 2014).
2026
NPR
California communities can reduce wildfire damage by half. Here’s how.
"A new UC Berkeley-led study demonstrates how two mitigation strategies — home hardening and defensible space — can have a major impact on wildfire destructiveness." ( Manke, 2025)
