No volcanoes in Colorado meet the criteria for a standalone “complete list” of named, individual volcanoes.
Define a volcano as a discrete, named edifice with a known eruption history and clear last-activity date. If your list requires modern-style cones or volcanoes with recorded or Holocene eruptions, Colorado returns no entries. The state has no active volcanoes and no clearly defined, recently erupting volcanoes that fit that strict definition.
Understand that Colorado’s volcanic story is real but different. Most volcanic activity there happened tens of millions of years ago. That activity formed large volcanic fields, calderas, and deep igneous plugs. Over time erosion wore away classic cone shapes. Examples that nearly fit the idea of “volcanoes” include the San Juan volcanic field (La Garita and other calderas), the Thirtynine Mile volcanic field east of the Front Range, and the twin Spanish Peaks (eroded volcanic centers). These are volcanic systems and ruins of eruptions, not single, active volcanoes with modern eruption dates.
Explore related categories instead. Look into volcanic fields, calderas, lava flows, volcanic necks, and exposed plutons in Colorado for geology and hiking. Check the San Juan volcanic field, the Thirtynine Mile volcanic field, and the Spanish Peaks for maps and trail access. Consult USGS and the Colorado Geological Survey for trusted data and guides.
