Adams County, CO Landscaping Rules: Weed Ordinances (2026)

4 of the Property Maintenance Code of Adams County, part of the 2024 International Property Maintenance Code amendments adopted under Ordinance No. 12 (effective July 1, 2026), requires that premises and exterior property be maintained free from weeds or plant growth in excess of 6 inches, and separately provides that noxious weeds shall be prohibited with no height threshold at all. The section defines a weed broadly as all grasses, annual plants and vegetation, other than trees or shrubs, but it specifically carves out cultivated flowers and gardens from that definition, so a maintained flower bed or vegetable garden is not measured against the 6-inch limit.

The rule applies to both vacant and occupied improved property in unincorporated Adams County, since the section refers to premises and exterior property generally rather than singling out vacant lots. This replaces the county's prior reliance on the state noxious-weed statute alone: Adams County's own code now sets a specific, enforceable inch-count for ordinary grass and weed growth rather than leaving the standard to state noxious-weed classifications, which only address a defined list of invasive species and never set a general mowing height.