San Juan Mountains, Colorado

Colorado, Knife Point, Needle Mountains, San Juan Mountains, Weminuche Wilderness, panorama, sunrise
Weminuche Wilderness, Colorado
Colorado, San Juan Mountains, Sneffels Range, Corbett
San Juan Mountains, Colorado
Colorado, Mount Sneffels, Ridgway, San Juan Mountains, sunset, sage
San Juan Mountains, Colorado
4th of July, Colorado, Ouray, San Juan Mountains, fireworks, Mount Abrams
Ouray, Colorado
Colorado, Mears Peak, San Juan Mountains, Sneffels Range, aspens, lupine, rainbow, wildflowers
San Juan Mountains, Colorado
Colorado, San Juan Mountains, Uncompahgre Wilderness, Wetterhorn Peak
Uncompahgre Wilderness, Colorado
Animas Mountain, Colorado, Needle Mountains, North Twilight Peak, San Juan Mountains, Twilight Peak, Weminuche Wilderness, West Needle Mountains, sunset
San Juan Mountains, Colorado
Colorado, Engineer Mountain, San Juan Mountains, sunrise
San Juan Mountains, Colorado
Colorado, San Juan Mountains, wildflowers
San Juan Mountains, Colorado
Colorado, Potosi Peak, San Juan Mountains, Sneffels Range, wildflowers
San Juan Mountains, Colorado
Colorado, San Juan Mountains, Uncompahgre Peak, Uncompahgre Wilderness
Uncompahgre Wilderness, Colorado
Colorado, San Juan Mountains, Uncompahgre Wilderness
Uncompahgre Wilderness, Colorado
Colorado, Dragonsback, San Juan Mountains, Uncompahgre Wilderness
Uncompahgre Wilderness, Colorado
Colorado, Ouray, San Juan Mountains, panorama, sunset
Ouray, Colorado
Baldy Peak, Colorado, San Juan Mountains, Sneffels Range, spring, aspens
San Juan Mountains, Colorado
Cimarrons, aspens, Sneffels Range, panorama, spring, Courthouse Mountain, Chimney Rock, Colorado
San Juan Mountains, Colorado
Cimarrons, Colorado, Precipice Peak, San Juan Mountains, Uncompahgre Peak, Uncompahgre Wilderness
San Juan Mountains, Colorado
Cimarrons, Colorado, San Juan Mountains, aspens
San Juan Mountains, Colorado
Cimarrons, Colorado, Mt. Sneffels, San Juan Mountains, Sneffels Range, sunrise
San Juan Mountains, Colorado
Cimarrons, Colorado, Precipice Peak, San Juan Mountains, Uncompahgre Peak, Uncompahgre Wilderness
San Juan Mountains, Colorado
Colorado, Ouray, San Juan Mountains, Twin Peaks, Million Dollar Highway, sunset
Ouray, Colorado
Cimarrons, Colorado, San Juan Mountains, aspens
San Juan Mountains, Colorado
Colorado, Gladstone Peak, Lizard Head Wilderness, Mount Wilson, San Juan Mountains, San Miguel Range, Wilson Peak, wildflowers
Lizard Head Wilderness, Colorado
Black Face Mountain, Colorado, Gladstone Peak, Lizard Head Peak, Lizard Head Wilderness, San Juan Mountains, San Miguel Range
Lizard Head Wilderness, Colorado
Black Face Mountain, Colorado, Gladstone Peak, Lizard Head Peak, Lizard Head Wilderness, Mount Wilson, San Juan Mountains, San Miguel Range, Wilson Peak, wildflowers
Lizard Head Wilderness, Colorado
Colorado, Lizard Head Wilderness, San Juan Mountains, San Miguel Range, Sunshine Mountain, rainbow, wildflowers
Lizard Head Wilderness, Colorado
Colorado, Lizard Head Peak, Lizard Head Wilderness, San Juan Mountains, San Miguel Range
Lizard Head Wilderness, Colorado
Colorado, El Diente, Gladstone Peak, Lizard Head Wilderness, San Juan Mountains, San Miguel Range, rainbow
Lizard Head Wilderness, Colorado
Colorado, Mount Sneffels, Potosi Peak, Richmond Basin, San Juan Mountains, Sneffels Range, columbine
San Juan Mountains, Colorado
Colorado, Comet NEOWISE, Mount Sneffels, Potosi Peak, San Juan Mountains, Sneffels Range, stars
Sneffels Range, Colorado
Colorado, San Juan Mountains, indian paintbrush, Silverton, wildflowers
San Juan Mountains, Colorado
Colorado, San Juan Mountains, wildflowers, paintbrush, sunrise
San Juan Mountains, Colorado

Geology of the San Juan Mountains

San Juans map

Around 30 million years ago, this was an area of huge volcanos and calderas. Some of the largest eruptions in the known history of the Earth covered the region in thick lava and ash flows. The lava, ash, and intrusive igneous rock in between were subsequently uplifted, almost completely covered in icefields during the Ice Age, then carved by glaciers into the mountains that we see today. This volcanic history gives the San Juans their unique and rugged characteristics that distinguish them from most other mountain ranges in the Colorado Rockies.

The broader San Juan Mountains consist of numerous sub-ranges including the remarkable Sneffels Range, Grenadier Range, Needle Mountains, San Miguel Range, and more. Large portions of these mountains are protected within the Weminuche Wilderness and Uncompaghre Wilderness areas, among others.

Although I've only posted about 150 photos from the San Juans in this gallery, I have over 800 photos from the San Juans in the search archives if you want to see more! You can also read lots of trip reports from the San Juans here.