Longmont, CO Fire Regulations: Brush Clearance (2026)

LMC Chapter 9.32 - Weed Control governs vegetation height on private property in Longmont. The City of Longmont Code Enforcement Division reports that weeds and grasses cannot exceed 12 inches in height; this is the most common code violation handled by Code Enforcement. The duty applies to the lot owner or occupant. Code Enforcement issues a written notice and a compliance period; if the owner fails to abate the city may abate at the owner's expense and lien costs to the property. Longmont sits on the Front Range plains at roughly 5,000 feet of elevation and is mapped outside the heavily wooded foothills WUI zone covered by Boulder County's IWUIC (International Wildland-Urban Interface Code) adoption; the City of Boulder, by contrast, adopts the 2024 IWUIC, and Longmont has not adopted that code. As a result, Longmont enforces grass and brush clearance through general weed/nuisance rules under Chapter 9.32 rather than as a wildfire defensible-space ordinance. Property owners adjacent to the St. Vrain Creek corridor should still maintain clear vegetation given seasonal grass-fire risk on the plains.