Andrews Glacier, Glacier in Rocky Mountain National Park, Colorado, US

Andrews Glacier is an alpine glacier in a cirque below Otis Peak (12,486 ft / 3,806 m) in Rocky Mountain National Park, Colorado. It runs from Andrews Pass at nearly 12,000 ft down to about 11,700 ft (3,700 to 3,600 m), with perennial snow reaching Andrews Tarn, the small proglacial lake at its foot.

Andrews Glacier lies in a cirque below Otis Peak, which rises to 12,486 feet (3,806 m). The ice runs from Andrews Pass at nearly 12,000 feet down to about 11,700 feet, with perennial snow continuing to Andrews Tarn. Comparisons of photographs from the early 1900s with those from the early 2000s show a negative mass balance, indicating the glacier is retreating.

Andrews Glacier sits in a cirque that draws hikers who want to experience high alpine terrain in Rocky Mountain National Park. The small lake just below it, Andrews Tarn, is a natural resting point where people often stop to take in the open sky and rocky slopes around them.

The glacier is reached by hiking from the Glacier Gorge Trailhead, following a trail that climbs through open alpine terrain for several miles. Solid footwear is important, and layers are a good idea since the weather at this elevation can change without much warning.

Andrews Glacier is one of the few remaining permanent ice patches in Colorado, yet its size is small enough that some scientists debate whether it qualifies as a true glacier or simply a perennial snowfield. The distinction matters for how its changes are tracked over time.