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.
Boulder, CO
Boulder may require defensible space around structures. WUI communities have stricter standards. Marshall Fire (2021) increased Front Range enforcement.
Boulder, CO
Boulder may have wildfire hazard zones requiring defensible space around structures, fire-resistant building materials, and vegetation management.
See how Boulder's defensible space rules stack up against other locations.
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