Welcome to the Gilpin County Noxious Weed website
Protect our wildflowers and wildlife from Noxious weeds.
Control the weeds on your property.
Noxious Weeds In Gilpin County (click on green links for more)
Weed killer check-out program for Gilpin County residents to control certain weeds on their property. If you have thistles, knapweeds, oxeye daisy, and scentless chamomile, you can check out a new herbicide called Milestone, which has a very low use rate, is labeled as practically non-toxic (for people, bees, birds, and aquatics and groundwater), and is not restricted use (no commercial pesticide license required). If you have leafy spurge, hoary cress, perennial pepperweed, or cheat grass, you can check out an herbicide called Plateau, which is also low toxicity. The Extension Office will have the herbicides and a sprayer available for checkout at no charge; there will be a $100 fully refundable deposit to ensure prompt return of the sprayer. You will have three days to complete your project unless prior arrangements are made.
Helpful Links
- Gilpin County Weed Ordinance
- Colorado State Weed law and State Noxious weed list
- Colorado Environmental Pesticide Education program
For those with new construction: newly excavated or bare areas should be revegetated to prevent weeds and erosion. Visit the Mountain gardening website for local information on how to replant your land.

