The Colorado Noxious Weed Act has established the
Colorado Noxious Weed List and requires all landowners in Colorado to control these weeds on their property.
Of the 73 Noxious Weeds on the State List, 35 are found in Pitkin County and are included on the
Pitkin County Noxious Weed List.Detailed Information about each weed on the Pitkin County Noxious Weed List can be found in the
Weed Descriptions Section of the Pitkin County Weed Management Plan.