California regulators approved the "Zone Zero" fire-safe landscaping rules Wednesday to limit flammable materials around homes in fire-prone areas.
The measure aims to reduce the risk of residential structures igniting during wildfires by creating a buffer that limits the spread of embers. Because wildfires have become increasingly destructive, the state is shifting from voluntary guidelines to mandatory requirements for home protection.
The California Board of Forestry and state regulators adopted the rules on Aug. 19 [1, 2]. Under the new mandate, homeowners must remove vegetation and other flammable materials within five feet of their houses [2, 4]. This specific area, known as Zone Zero, serves as the first line of defense against embers that can land on porches or against siding to start a fire [3, 4].
Nearly 2 million homes across the state are expected to be affected by these adjustments [4]. The rules apply specifically to residential areas identified as fire-prone, where the risk of ignition is highest during the dry season [1, 3].
By eliminating plants, mulch, and wooden fences in this immediate perimeter, the state hopes to break the path of fire from the landscape to the structure [3, 5]. These regulations represent some of the strictest home landscaping requirements in the U.S. to date [3].
State officials said the goal is to create a vegetation-free buffer that prevents ember ignition [3, 5]. While some homeowners may face challenges in reshaping their yards, the board said it focused on the necessity of reducing fuel sources near home foundations [2, 5].
“Homeowners must remove vegetation and other flammable materials within five feet of their houses.”
The adoption of Zone Zero marks a transition toward aggressive, mandatory defensible space requirements in California. By targeting the immediate five-foot perimeter, the state is prioritizing the prevention of ember-driven ignitions, which are often responsible for home loss even when larger brush fires are held at a distance. This move likely signals a broader trend of shifting wildfire liability and mitigation responsibility directly onto property owners.
