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.