C
- Colin Todd Hut and the Iso Glacier
- Collade wee line.
- Collado de Borreguile's north face.
- Collado de Borreguiles traverse
- Collado line
- Coll blanc
- Coll blanc W
- Coll de Jou
- Coll de les Cases
- Colle d' Egua
- Colle d' Egua
- Colle della Fronte, East face
- Colle delle Locce
- Colle del Lys
- Colle del Turlo
- Colle del Vallè
- Col le Queyrellet
- Colle Salza - Gabiet normal route
- Collet de Marimanha
- Colle Valdobbia - Ospizio Sottile
- Collings Mountain
- Collings Mountain Loop
- Coll Portella South
- Collserola North Loop
- Colne Valley Way
- Colombina
- Colorado
- Colorado Mines Peak
- Colorado Trail
- Colorado Trail: Camp Hale to Tennessee Pass
- Colorado Trail: Cochetopa Hills
- Colorado Trail: Collegiate Peaks Wilderness Bypass
- Colorado Trail: Denver to Buffalo Creek
- Colorado Trail: Highway 50 to Cottonwood Pass
- Colorado Trail: Holy Cross and Mount Massive Wilderness Bypass
- Colorado Trail: Kennebec Pass to Durango
- Colorado Trail: Kenosha Pass to Breckenridge
- Colorado Trail: Kenosha Pass to Lost Creek Wilderness Out-and-Back
- Colorado Trail: La Garita Bypass
- Colorado Trail: Lost Creek Wilderness Bypass
- Colorado Trail: Miner's Creek Segment
- Colorado Trail: Molas Pass to Hermosa Park Road
- Colorado Trail: Mount Massive Wilderness to Twin Lakes
- Colorado Trail: Sargents Mesa
- Colorado Trail: Searle Pass and Kokomo Pass
- Colorado Trail Segment 22: Spring Creek Pass Trailhead to Carson Saddle
- Colorado Trail Segment 23: Carson Saddle to Stony Pass Trailhead
- Colorado Trail Segment 26: Blackhawk Pass
- Colorado Trail: Segment 27
- Colorado Trail: Silverton to Durango
- Colorado Trail: Ten Mile Range Bypass
- Colorado Trail: Tennessee Pass to Holy Cross Wilderness Out-and-Back
- Colorado Trail: Twin Lakes to Clear Creek Reservoir
- Colorado Trail: Weminuche Wilderness Bypass
- Colossal Cave Loop
- Col Pers, avoiding Gorge
- Col Pers Classic
- Col Ratti
- Col Sereina
- Colter's Crawl
- Col Toronn
- Col Tsa Seche Adventure
- Columbine Loop
- Columbine Loop
- Columbine Loop
- Comapedrosa
- Comate
- Combe a Germain
- Combe à Marion
- Combe aux Corbeaux
- Combe aux Poubelles
- Combe / Biollaire
- Combe chairlift's line
- Combe de la Gliere
- Combe de La Vélière
- Combe des Rachasses
- Combe des Roches
- Combe du Bras
- Combe du Génépy
- Combe Obscure