Boulder requires defensible space around homes in designated Wildland-Urban Interface zones, with mandatory vegetation clearance, ember-resistant materials, and Wildfire Partners home assessments — particularly urgent after the 2021 Marshall Fire devastated nearby Louisville and Superior.
Boulder's Wildland-Urban Interface (WUI) code under BRC Title 10 mandates defensible space zones around structures: Zone 1 (0-5 feet) noncombustible, Zone 2 (5-30 feet) lean and clean vegetation, and Zone 3 (30-100 feet or property line) thinned forest. The Marshall Fire of December 2021, which destroyed over 1,000 homes in adjacent Louisville and Superior, accelerated Boulder's WUI hardening requirements. Wildfire Partners, a Boulder County program, provides free home assessments and partial cost-share for mitigation. New construction in mapped WUI zones must use Class A roofing, ember-resistant vents, and noncombustible siding. Boulder Fire-Rescue conducts compliance inspections.
Failure to maintain defensible space can trigger Boulder Fire-Rescue abatement orders, with the city authorized to perform clearance and lien property for cost recovery on non-compliant parcels.
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