Summit CWMA
Native wildflowers in a high meadow on the Uinta-Wasatch-Cache National Forest

Noxious weeds

Know it when you see it.

A noxious weed is a plant designated noxious by federal, state or county law because of its environmental, health or financial impact. This is every one Summit CWMA tracks, sorted by how urgently we need to hear from you.

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What we are protecting · Photo: US Forest Service

Utah class designations

Five classes, five different responses.

  • 1A

    Early Detection Rapid Response, watch list

    9 species

    Not known to exist in Utah. A very high priority: if you find one here, we want to know the same day.

  • 1B

    Early Detection Rapid Response

    12 species

    Known in Utah but in very limited populations. Also a very high priority, because eradication is still realistic.

  • 2

    Control

    12 species

    Established in varying populations statewide, at a concentration where control or eradication may still be possible. High priority.

  • 3

    Containment

    16 species

    Widely spread. Effort goes to new or expanding populations; established stands are managed by whatever method the weed control authority approves.

  • 4

    Prohibited

    5 species

    A threat through retail sale or propagation in the nursery and greenhouse trade. Illegal to sell or propagate in Utah.

Summit County by the numbers

What has actually been found here.

9,410 infestation records logged to EDDMapS for Summit County since 2013. Records, not plants: one can be a single rosette or a dense acre.

See where we map
9,410
infestation records
31
noxious species recorded
8,163
infested acres recorded
2026
most recent season
last record 2026-09-15

Ten most recorded species

  1. Garlic mustard6,689 records
  2. Common reed478 records
  3. Musk thistle464 records
  4. Canada thistle294 records
  5. Dyer's woad276 records
  6. Houndstongue171 records
  7. Scotch thistle152 records
  8. Dalmatian toadflax142 records
  9. Hoary cress123 records
  10. Yellow toadflax79 records

Records logged per year

  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
Records per year: 13 36, 14 533, 15 582, 16 479, 17 1087, 18 353, 19 304, 20 424, 21 73, 22 3172, 23 670, 24 264, 25 1335, 26 98

Two-digit years, 2013 to 2026. Source: EDDMapS / Utah SIIPA, refreshed hourly.

The full list

Every noxious weed we track.

Search by common or scientific name, or filter to a class. Class 1A and 1B are the ones to call us about the day you see them. Designations follow the Utah Department of Agriculture and Food listing.

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