| Geissler Mountain | |
| Elevation Ft: | 13381 |
| Elevation Ref: | [1] |
| Prominence Ft: | 575 |
| Isolation Mi: | 0.82 |
| Parent Peak: | Twining Peak (13,711 ft)[2] |
| Country: | United States |
| State: | Colorado |
| Region: | Pitkin County |
| Region Type: | County |
| Part Type: | Protected area |
| Part: | Hunter–Fryingpan Wilderness |
| Range: | Rocky Mountains Sawatch Range[3] |
| Map: | Colorado#USA |
| Coordinates: | 39.1487°N -106.573°W |
| Coordinates Ref: | [4] |
| Topo: | USGS Mount Champion |
| Easiest Route: | hiking |
Geissler Mountain is a 13381feet summit in Pitkin County, Colorado, United States.
Geissler Mountain is set 1miles west of the Continental Divide and north of Independence Pass in the Sawatch Range which is a subrange of the Rocky Mountains. The mountain is located 14miles east of the community of Aspen in the Hunter–Fryingpan Wilderness, on land managed by White River National Forest. It ranks as the fourth-highest peak within the wilderness.[2] The mountain has two primary peaks, the higher East summit (13,381') and West summit (13,308'),[5] and the USGS places the summit on the east peak.[4] Precipitation runoff from the mountain's south slope drains into headwaters of the Roaring Fork River and from the north slope into Lost Man Creek which is a tributary of the Roaring Fork. Topographic relief is modest as the summit rises 1780feet above Lost Man Creek in approximately 1miles and 930feet above Lost Man Lake in 0.25miles. An ascent of the summit involves hiking 5miles with 1730feet of elevation gain.[6] The mountain's toponym has been officially adopted by the United States Board on Geographic Names,[4] and has been recorded in publications since at least 1943.[7]
According to the Köppen climate classification system, Geissler Mountain is located in an alpine subarctic climate zone with cold, snowy winters, and cool to warm summers.[8] Due to its altitude, it receives precipitation all year, as snow in winter, and as thunderstorms in summer, with a dry period in late spring.