2017
Santa Rosa Fires
Devastating losses prompt major research into defensible space and ember attack prevention.
Official information on the 0-5 foot ember-resistant zone.
Based on CAL FIRE guidance.
This resource is maintained by Mulholland Brand. All information sourced from CAL FIRE,
Board of Forestry, and IBHS.
Zone 0 is the area extending 0-5 feet from your home, defined by the California Board of Forestry & Fire Protection as the most critical defensible space zone. It focuses on intense fuel reduction to protect against ember attacks. Research shows that the majority of home ignitions during wildfires are caused by wind-driven embers landing on combustible materials near the structure. Zone 0 requires non-combustible materials, hardscaping, and removal of all fuel sources within this critical perimeter..
Devastating losses prompt major research into defensible space and ember attack prevention.
California legislature mandates Board of Forestry to study and implement Zone 0 requirements.
Board of Forestry & Fire Protection finalizes Zone 0 regulations.
Local fire departments begin enforcing Zone 0 compliance, starting with education.
Source: California Board of Forestry & Fire Protection.
Non-combustible materials, hardscape, maximum fuel reduction within 5 feet of structure.
Vegetation spacing, proper pruning, clearance requirements for defensible perimeter.
Tree thinning, dead vegetation removal, reduced fuel load to slow fire approach.
All three zones work together. Zone 0 is the most critical.
Board of Forestry rules finalize December 31, 2025. Local enforcement begins 2026-2027.
Requirements from CAL FIRE. Printable format to check off items on your property.
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