Utah Weed Control Association - Utah's noxious weed control experts
Noxious weeds



Utah Noxious
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Utah's Noxious Weed List

Utah recently added 9 new weeds to the State Noxious Weed List and now has a total of 27 weeds listed on the noxious weed list. Additionally these weeds are prioritized into three levels: A, B, and C.

"Class A" weeds have a relatively low population size within the State and are of highest priority being an Early Detection Rapid Response (EDRR) weed.

"Class B" weeds have a moderate population throughout the State and generally are thought to be controllable in most areas.

"Class C" weeds are found extensively in the State and are thought to be beyond control. Statewide efforts would generally be towards containment of smaller infestations.

Each county in Utah may have different priorities regarding specific State designated Noxious Weeds and is therefore able to reprioritize these weeds as they see fit for their own needs.

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State Noxious Weeds

Class A Weeds

Black Henbane

Diffuse Knapweed


Leafy Spurge


Oxeye Daisy

Purple Loosestrife

St. Johnswort

Spotted Knapweed

Sulfur Cinquefoil

Yellow Starthistle

Yellow Toadflax


State Noxious Weeds

Class B Weeds


Dalmatian Toadflax

Dyer's Woad

Hoary Cress

Musk Thistle

Perennial Pepperweed

Poison Hemlock

Russian Knapweed

Squarrose Knapweed

Scotch Thistle

Class C Weeds

Canada Thistle

Field Bindweed




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