Montana Noxious Weed List

Montana Noxious Weed List (June 2019)

Updated 2020 flipbook of Montana's Noxious Weeds

Priority 1A:

These weeds are not present or have a very limited presence in Montana. Management criteria will require eradication if detected, education, and prevention.

Priority 1B:

These weeds have limited presence in Montana. Management criteria will require eradication or containment and education.

Priority 2A:

These weeds are common in isolated areas of Montana. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by local weed districts.

Priority 2B:

These weeds are abundant in Montana and widespread in many counties. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by local weed districts.

Priority 3: Regulated Plants (NOT MONTANA LISTED NOXIOUS WEEDS)

These regulated plants have the potential to have significant negative impacts. The plant may not be intentionally spread or sold other than as a contaminant in agricultural products. The state recommends research, education and prevention to minimize the spread of the regulated plant.

  • Cheatgrass (Bromus tectorum)
  • Hydrilla (Hydrilla verticillata)
  • Russian olive (Elaeagnus angustifolia)
  • Brazilian waterweed (Egeria densa)
  • Parrot feather watermilfoil (Myriophyllum aquaticum or M. brasiliense)