Utah's Noxious Weed List
Utah lists a total of 27 weeds 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 therefore may reprioritize these weeds as they see fit for their own needs.
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Class A Weeds
 Black Henbane |
 Diffuse Knapweed |
 Johnsongrass |
 Leafy Spurge |
 Medusahead |
 Oxeye Daisy |
 Purple Loosestrife |
 St. Johnswort |
 Spotted Knapweed |
 Sulfur Cinquefoil |
 Yellow Starthistle |
 Yellow Toadflax |
Class B Weeds
 Bermudagrass |
 Dalmatian Toadflax |
 Dyer's Woad |
 Hoary Cress |
 Musk Thistle |
 Perennial Pepperweed |
 Poison Hemlock |
 Russian Knapweed |
 Scotch Thistle |
 Squarrose Knapweed |
Class C Weeds
 Canada Thistle |
 Field Bindweed |
 Houndstongue |
 Quackgrass |
 Saltcedar |