Colorado Noxious Weed List
List A Species in Colorado that are designated by the Commissioner for eradication.
List B Species List B Species are weeds for which the Commissioner, in collaboration with advisors and local governments, creates state management plans to halt their spread.
List C Species are weeds for which the Commissioner, working with advisors and local governments, creates state management plans. These plans support local efforts for integrated weed management on public and private lands, focusing on education, research, and biological control rather than stopping their spread.
Watch List Species are those identified as potential threats to Colorado's agriculture and environment. This list serves to advise and educate, encouraging identification and reporting to help determine which species should be designated as noxious weeds. Colorado Watch List - Pocket Guide
Printable: Noxious Weed List sorted by Common Name and by Scientific Name.
Need Help Identifying A Weed?
Contact Your County Weed Manager or Local CSU Extension Agent.
List A Species
Not Known In CO | Fewer Than 10 Known Populations | More Than 10 Populations
Fewer Than 10 Known Populations
More Than 10 Populations in Colorado
