Noxious Weeds

Grand County Division of Natural Resources identifies and manages State listed Noxious weeds on all County Rights-of-Way, County properties and we partner with local offices of the USFS and BLM for invasive species control as required by State law.  We do not work on private property.

Noxious weeds are a direct and growing threat to the native environment of Grand County and the west.  They threaten the very reasons we live, work, and recreate in Colorado and all Colorado land owners are responsible for controlling noxious weeds on their property.  Noxious weeds are non-native plant species that have been introduced into an environment with few, if any, natural biological controls, thus giving them a distinct competitive advantage in dominating and crowding out native plant species, thus altering plant diversity and ecosystem integrity. They are aggressive, spread rapidly, possess the ability to reproduce profusely, and resist control. Pollinators are pushed to pollinating more of the non-native species instead of the native species', furthering their ability to displace native flora and negatively affect wildlife habitat and native ecosystems.

Establishment & Control

Noxious weeds become established in soils disturbed by a variety of activities such as construction, motorized vehicles, road maintenance, recreation, improper livestock grazing, and natural disturbances such as fire. Noxious weed seeds are transported to new sites in numerous ways such as wind, water, tires, people, as well as on or in wild and domestic animals.

Grand County Division of Natural Resources (DNR) operates under a directive from the Colorado Department of Agriculture to control and reduce the spread of noxious weeds in Grand County. This includes all county owned property, road rights of way, and public lands. Grand County DNR is also focused on providing information and assistance to private land owners to help control the spread of noxious weeds.

Although there are over 80 species of noxious weeds on the Colorado list, Grand County has 26 species for which we manage. Grand County Noxious Weed List
In an effort to assist small landowners, we provide a free, pre-mixed, herbicide give-away on Fridays from 9 am to Noon; you must bring your own sprayer (no jugs, cans, etc). Please click here for more information:  2017 Herbicide Give-Away


Noxious Weed Control Partnerships

  • Bureau of Land Management
  • Colorado Department of Agriculture
  • Colorado Department of Transportation
  • Colorado Division of Wildlife
  • Colorado State Land Board
  • Colorado Weed Management Association
  • Grand County Division of Natural Resources
  • Habitat Partnership Program
  • Middle Park Soil Conservation Service
  • Natural Resource Conservation Service
  • United States Forest Service