Bloomipedia
Columbian monkshood (Aconitum columbianum)
Photo: Loren Cassin Sackett via iNaturalist · CC BY 4.0 · resized

Flower profile

Columbian monkshood

Aconitum columbianum

Native in the lower 48

Columbian monkshood is a wildflower that USDA PLANTS lists as native in the lower 48 states. It's on our flower lists for 3 states, and across the U.S. it's most often seen in bloom in June–August.

13states
3of our state lists
7,601U.S. sightings*

*iNaturalist research-grade observations, as of October 17, 2026.

On our lists for: Colorado, Idaho, Wyoming

Quick look

Aconitum columbianum is a species of flowering plant in the buttercup family known by the common names Columbian monkshood or western monkshood.

  • It belongs to the Ranunculaceae family. iNaturalist
  • USDA PLANTS describes it as an herb (forb) with a perennial life cycle. USDA PLANTS
  • USDA PLANTS lists it as native in the lower 48 states and records it in 13 states. USDA PLANTS
  • NatureServe lists it as native to Colorado, Wyoming and Idaho. NatureServe
  • In Colorado, most iNaturalist sightings of it in flower come in July–August. iNaturalist
  • In Wyoming, most iNaturalist sightings of it in flower come in July–September. iNaturalist
  • USDA PLANTS lists its flower color as blue. USDA PLANTS
  • USDA PLANTS gives its bloom period as early summer. USDA PLANTS
  • USDA PLANTS lists a mature height of about 5 ft. USDA PLANTS
  • iNaturalist has 2,232 research-grade sightings of it in Colorado, ranking #70 among the 110 flowers on our Colorado list. iNaturalist
  • iNaturalist has 732 research-grade sightings of it in Wyoming, ranking #27 among the 107 flowers on our Wyoming list. iNaturalist
  • iNaturalist has 489 research-grade sightings of it in Idaho, ranking #73 among the 109 flowers on our Idaho list. iNaturalist

Columbian monkshood gift ideas

Handmade columbian monkshood gifts from independent makers.

When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (881 records)
Bloom time in each of our 3 states
StateTypePeak bloomSightings*
ColoradoNativeJuly–August2,232
WyomingNativeJuly–September732
IdahoNativefew records489

Conservation status

Federal (U.S. ESA)
Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. USFWS ECOS
NatureServe global
G5 Secure worldwide. NatureServe
Colorado
No list Colorado has no state law listing endangered or threatened plants, so we show NatureServe's Colorado ranks instead. NatureServe: S4, apparently secure in Colorado.
Wyoming
No list Wyoming has no state law listing endangered or threatened plants, so we show NatureServe's Wyoming ranks instead. NatureServe: S4, apparently secure in Wyoming.
Idaho
No list Idaho has no state law listing endangered or threatened plants, so we show NatureServe's Idaho ranks instead. NatureServe: SNR, not yet ranked in Idaho.
Rare elsewhere
No other U.S. state ranks it S1, S2, SH or SX.

Checked October 17, 2026. Rankings and lists can change, so follow the links for the latest.

Can you eat it?

For peopleToxic (moderate, per USDA)

USDA PLANTS rates its toxicity as “moderate.” (USDA's rating covers people and livestock and doesn't say which parts.) NC State Extension has no page for it. USDA PLANTS

For petsNot well documented

It isn't on the ASPCA plant list.

🌿 Never eat a wild plant unless you're certain of its ID; this isn't medical advice. Worried about a person? Call Poison Control at 1-800-222-1222. Worried about a pet? Call your vet.

Where does it grow?

USDA PLANTS records columbian monkshood in 13 states.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Arizona, California, Colorado, Idaho, Iowa, Montana, Nevada, New Mexico, Oregon, South Dakota, Utah, Washington, Wyoming.

Colorado counties with USDA records: Alamosa, Boulder, Chaffee, Conejos, Costilla, Custer, Dolores, El Paso, Garfield, Gilpin, Grand, Gunnison, Hinsdale, Huerfano, Jackson, La Plata, Lake, Larimer, Las Animas, Mineral, Montezuma, Ouray, Park, Rio Blanco, Rio Grande, Routt, Saguache, San Juan, Teller.

Wyoming counties with USDA records: Albany, Big Horn, Carbon, Crook, Fremont, Johnson, Laramie, Natrona, Niobrara, Park, Platte, Teton, Uinta, Weston.

Idaho counties with USDA records: Ada, Adams, Bannock, Blaine, Boise, Bonner, Cassia, Clearwater, Custer, Elmore, Franklin, Fremont, Gem, Idaho, Kootenai, Latah, Lemhi, Nez Perce, Owyhee, Shoshone, Twin Falls, Valley.

More Colorado flowers

Sources