Gross Schärhorn, Alpine summit in Uri, Switzerland.

Gross Schärhorn is a mountain in the Glarus Alps near Klausen Pass, in the canton of Uri. Its highest summit reaches 3,297 m and lies about 400 metres east of the Chli Schärhorn (3,232 m), forming a double peak between the Maderanertal and Schächental valleys. The mountain overlooks the Schächental to the north and the Hüfifirn glacier to the southeast.

The mountain was first explored and mapped by Swiss mountaineers in the 1800s as part of early alpine climbing ventures. Its exact position and elevation were later documented through official surveys that established precise topographical records.

The double summit of Gross and Chli Schärhorn is climbed from the Klausen Pass via the Chammlialp and the moraines of the Griesfirn to the Chammlilücke at 2,854 m, then along the east ridge. The Hüfihütte in the south and the Planurahütte in the east give access to the same ridge over the Hüfifirn.

The best climbing season runs from June through September when higher passages are mostly snow-free and conditions are stable. Climbers should start early in the day and remain flexible with their plans based on changing weather conditions.

The mountain sits within a glacier-filled landscape bordered by three large ice fields that descend in different directions from the summit. This arrangement creates a dynamic ice environment that changes seasonally and offers views rarely seen from other alpine peaks in the region.