Noxious Weeds

What is a Noxious Weed?

The term "Noxious Weed" is a designation given to a plant that is non-native to North America and has aggressive, invasive tendencies. They threaten our drinking water supply, agricultural crops, ecosystems, and native habitats. Often these weeds are kept in check by natural controls (e.g. insects, climate, etc.) in their native territory.  However, lacking such controls in our area, these plants are able to spread aggressively, allowing them to crowd out native plants, dominate local plant communities, and destroy local ecosystems. 

There are over 34 species of noxious weeds in Pitkin County, and they receive their designation from the Colorado Noxious Weed Act.

Bag of Weed Program

Through September
Sign up at the Snowmass Village Recreation Center
2835 Brush Creek Road
Bags and noxious weed guide books provided.

The Town of Snowmass Village has been working diligently to eradicate noxious weeds over the last five years. We have been experimenting with new organic weed management strategies from a vinegar solution to steam. Weeds continue to be a problem therefore; we need your help. The Parks and Trails Department is continuing its weed pull program and asking Snowmass Residents to pull weeds listed below.

IMPORTANT: Please only pull weeds from Town of Snowmass Village Open Space and Trails and ask us if you need locations to pull weeds. Do your homework and properly identify the weeds before pulling. We are seeing a lot of native thistle this year, please do not pull native plants. Understand the proper technique for pulling (Please read the mechanical control techniques under the plant species you are pulling and use extreme caution when pulling POISON HEMLOCK). The individual who pulls the most weeds will receive a free one-year TOSV Recreation Center Membership.

•Scentless Chamomile (Matricaria perforata)- Hand pulling, bagging, and disposal is the most effective method to prevent their spread into new areas.

•Oxeye Daisy (Chrysanthemum leucanthemum)- Repeated tillage or digging for removal.

•Poison Hemlock (Conium maculatum) Caution: wear gloves (avoid poisonous sap), face mask (mouth protection), and eye protection when removing. Tillage/Digging/Pulling recommended.

•Common Tansy (Tanacetum vulgare)- Mow or cut to decrease seed production. Pulling and digging are ineffective and can stimulate roots to spread.

•Canada Thistle (Cirsium arvense)- Do not cut tap root (this will increase growth), regular cutting/or tillage of plant should diminish it’s reserves.

•Plumeless Thistle (Carduus acanthoides)- Mowing, cutting, digging, pulling or cultivation are all effective if done prior to flowering

•Houndstongue (Cynoglossum officinale L.)- Root crown must be severed and removed properly. Remove and dispose of entire plant (root, leaves, flowers, etc.)

2019 Weed Pull- Begins July 30th

1. Stop by our office to pick up trash bags, 2835 Brush Creek Rd.

2. Do your homework and properly identify the weeds before pulling. Bring the plant to 2835 Brush Creek Road and we can help you identify, or email the Parks and Trails Manager, Starr Jamison at with questions.

3. Read descriptions above to properly remove the weed. WARNING: Poison Hemlock should not be removed without the proper safety gear.

4. Bring your bags to 2835 Brush Creek Rd. and we will count your bags and properly dispose.

5. Pull the most weeds and you will receive a free 1-year Recreation Center Membership ($660 value).

What can you do to Help?

The Town works hard with landowners and Pitkin County to prevent noxious weeds from spreading, but we can't do it alone. Everyone should take part in healthy land management, and the Town believes in assisting landowners to achieve this. The most effective way for you to help is to treat your own property, and there are numerous resources to help you get started. 

Controlling Weeds on Your Own Property:

Pitkin County offers a variety of services to help you comply with the Colorado Noxious Weed Act and keep your land healthy, native, and beautiful. All services are free, including a backpack sprayer loan program, a cost sharing program, and educational materials.

 Land Management Staff are also happy to visit your property and help you identify plants in person.  Contact the office at 920-5214.

Reporting Noxious Weeds on Neighboring Properties:

When it comes to weed control, It is important that we all be Good Neighbors because weeds know no property boundaries and easily spread. However, many people are still unaware of their weed management responsibilities.  Thus, the first step is to make sure your neighbor knows about the infestation his/her responsibility to comply with the Colorado Noxious Weed Act.  We have found that most people will voluntarily take appropriate action to control the spread of invasive plants on their property once they become aware of the problem.  

Once these voluntary methods are exhausted, Pitkin County may be contacted for enforcement. For more information, visit Pitkin County's Noxious Weed Enforcement Page.

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