In unincorporated Adams County, tall, overgrown grass, weeds and brush over 12 inches is treated as environmental blight and can trigger a code-compliance case. Colorado's Noxious Weed Act separately requires all landowners to manage designated noxious weeds.
Adams County Code Compliance identifies 'tall, overgrown grass, weeds and brush (12 inches)' as environmental blight on unincorporated property, so mowing to keep growth under 12 inches is the practical standard. On top of the county blight rule, the Colorado Noxious Weed Act (CRS 35-5.5-104) imposes a statewide duty on every landowner to manage listed noxious weeds. List A species must be eradicated wherever detected. Overgrown grass or weeds on a lot are handled through the county's complaint-driven code-compliance process, while noxious-weed enforcement runs through the county's weed program. Incorporated cities set their own grass/weed-height rules.
Blight cases begin with a notice and correction period; unresolved overgrowth can lead to a citation and county abatement (mowing) billed to the owner under CRS 30-15-401. Noxious-weed violations are enforced under the Noxious Weed Act.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Thornton, CO
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