Colorado Noxious Weed List
List A Species If you find it, eradicate it. A newly arrived, uncommon, and potentially dangerous plant that requires mandatory eradication from all lands within the state to prevent it from becoming a larger problem. The management goal for List A species is their complete elimination to protect the economic and environmental health of Colorado.
List B Species Help stop the spread. Invasive plants with discrete, statewide distributions that must be managed to stop their continued spread, either through eradication, containment, or suppression, with the specific strategy varying by location and determined by the Colorado Commissioner in consultation with local governments. These are non-native plants already established in Colorado that have the potential to cause significant ecological damage, and their spread is a priority for the state.
List C Species Widely distributed. The species are widespread and well-established throughout the state, making statewide eradication impractical. The Colorado Department of Agriculture provides educational, research, and biological control resources to support local management efforts.
Watch List Species Report to EDDMapS! More information needed to assess the threat. 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
