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This field guide is designed to help you identify Montana’s 36 state-listed noxious weeds and the 5 Priority 3 regulated plants (These 5 regulated plants are not a part of Montana’s listed noxious weeds, but rather a sort of watch list). Each plant review includes the photos and the 10 characteristics defined to your right.
If you believe you have found a noxious weed, please contact your county weed district or tribal area office. They can help you with a management plan, offer best practices on control and eradication and, in some counties, they provide cost-share programs to assist you with management.
2019 Montana State Noxious Weed List (the most current)
County listed noxious weeds (2024, the most current)
Click on photos for plant details …
( Echium vulgare )
( Egeria densa )
( Cirsium arvense )
( Bromous tectorum )
( Rhamnus cathartica L )
( Phragmites australis )
( Tanacetum vulgare )
( Potamogeton crispus )
( Linaria dalmatica )
( Centaurea diffusa )
( Isatis tinctoria )
( Myriophyllum spicatum )
( Convolvulus arvensis )
( Butomus umbellatus )
( Berteroa incana )
( Cynoglossum officinale )
( Hydrilla verticillata )
( Reynoutria japonica )
( Euphorbia esula )
( Hieracium caespitosum )
( Taeniatherum caput-medusa )
( Hieracium aurantiacum )
( Leuconthemum vulgare )
( Myriophyllum aquaticum )
( Lepidium latifolium )
( Lythrum salicaria )
( Chondrilla juncea )
( Acroptilon repens, Rhaponticum repens )
( Elaeagnus angustfolia )
( Tamarix ramosissima, T. chinensis )
( Cytisus scoparius )
( Centaurea stoebe )
( Hypericum perforatum )
( Potentilla recta )
( Ranunculus acris )
( Senecio jacobaea, Jacobaea vulgaris )
( )
( Cardaria draba, Lepidiuim draba )
( Centaurea solstitialis )
( Linaria vulgaris )
( Iris pseudacorus )
August 24 – 26, 2026
Northern Plains Weed Management Symposium
North Dakota 4-H Camp, Washburn ND
Agenda & Registration
September 19, 2026
2026 Annual Weed Whackers Ball
Wise River Community Center
Register here
September 14-18, 2026
UTV Train the Trainer Course for Weed Coordinators Only
Cascade County Weed District, Vaughn, MT
Please contact Levi Capdeville for more information at (406) 263-9333.
September 21 – 25, 2026
ATV Train the Trainer Course for Weed Coordinators Only
Cascade County Weed District, Vaughn, MT
Please contact Levi Capdeville for more information at (406) 263-9333.
October 7 & 8, 2026
MWCA Fall Weed Manager Training
Libby, MT
Details TBA
Noxious Weed Fundraisers Coming Soon to SW Montana!
If you are in the areas, please check them out.
The Madison Valley Ranchlands Weed Committee is hosting their annual fundraiser on Saturday, August 8th at the
Big Sky Airport in Ennis! Contact Melissa Griffiths for more information at 406-682-3731 or by email
The annual Weed Whackers Ball will be held at the Wise River Community Center on September 12th. Registration can be found on this webpage under events. For more information please email Amber.
