Noxious Weeds

What are noxious weeds?

Noxious weeds are defined by the Colorado Noxious Weed Act as an alien plant or parts of an alien plant that have been designated by rule as being noxious or has been declared a noxious weed by a local advisory board, and meets one or more of the following criteria:

- Aggressively invades or is detrimental to economic crops or native plant communities

- Is poisonous to livestock

- Is a carrier of detrimental insects, diseases, or parasites

- The direct or indirect effect of the presence of this plant is detrimental to the environmentally sound management of natural or agricultural ecosystems.

Landowner Assistance

For a list of Colorado's Noxious Weeds, click here.

Visit the Colorado Dept. of Agriculture's website to find fact sheets for all listed Noxious Weed species in the state.  

Or, download the CDA Noxious Weed App for iPhone or Android