Location and surroundings
Sunniggratli is situated in the Urner Alps, which are part of the Northwestern Alps, the Western Alps, the Alps, and the Central European Highlands. It is located within the municipality of Gurtnellen in the region of Uri, Switzerland. Among the 384 named peaks in the Urner Alps, it ranks as the 334th highest. The landscape surrounding the peak includes mountain passes, alpine meadows, and the nearby Arnisee, which was artificially dammed to serve as a storage power plant.
Neighbouring peaks
- Langchälengrätli, peak, 2,204 m, 1.0 km W
- Furggi, mountain pass, 2,166 m, 1.1 km W
- Stock, peak, 2,309 m, 1.2 km NW
- Grossgand, peak, 2,311 m, 1.2 km NW
- Holzbiel, peak, 1,796 m, 1.3 km N
- Schijen, peak, 2,096 m, 1.4 km NW
- Ruchälplistock, peak, 2,476 m, 1.7 km NW
- Jakobiger, peak, 2,505 m, 2.3 km NW
Sunniggratli is lower than its immediate neighbors to the west and northwest, with Langchälengrätli being the nearest higher peak.
The view from the summit
From the summit, one can observe several major peaks within a 25 km radius. These include the Dammastock (3,630 m, 22.8 km SW), which is the highest peak of the Urner Alps, and the Piz Russein (3,614 m, 21.2 km E). Other notable giants visible include the Sustenhorn (3,503 m, 16.9 km SW), Hinter Tierberg (3,446 m, 21.6 km SW), Bifertenstock (3,419 m, 24.3 km E), and Fleckistock (3,416 m, 13.7 km SW).
The range
Sunniggratli is part of the Urner Alps, a range spanning parts of Switzerland. The highest point of this range is the Dammastock, which reaches 3,630 m and is located 23 km southwest of Sunniggratli. The range contains 384 named peaks, and Sunniggratli holds the 334th position in terms of elevation within this group.
Climbing routes
There are two via ferrata routes to the top, both graded on the K-scale. The easiest route is the Emergency exit, graded K1, which involves about 40 m of cable and starts near the Bergrestaurant Sunniggratli. A more challenging option is the Adlerhorst, graded K4−, which features approximately 100 m of cable and also begins near the Bergrestaurant Sunniggratli. Both routes are located between 1,480 m and 1,500 m elevation.
Access and starting points
Access to the mountain is typically gained from the Reusstal valley. Starting points include Intschi or Amsteg, where visitors can use a cable car to reach the Arnisee before hiking to the summit. From Gurtnellen Dorf, the hike via the Arnisee terrace takes approximately 4 hours. The nearest settlements are Silenen (2.5 km E), Amsteg (2.8 km SE), and Erstfeld (4.3 km N). The Erstfeld railway station is the primary public transport hub for the area.
Climate and weather
Based on estimates from NASA POWER climate data, the mean temperature at the summit varies from about 11 °C in July to about -7 °C in January. Annual precipitation in the surrounding area is about 1,550 mm, with August being the wettest month (about 190 mm) and February the driest (about 80 mm). Weather in the Urner Alps can change rapidly, and hikers should be prepared for sudden temperature drops, fog, and thunderstorms, which are common hazards in this high-altitude environment.
Best time to visit
The months with a mean temperature above freezing at the summit are April, May, June, July, August, September, and October. These months generally offer the most favorable conditions for hiking and climbing. The summer season, particularly from July to August, is the most popular time for visiting, as the Sunniggrathütte is staffed during this period.
Nature and wildlife
The slopes of Sunniggratli are characterized by rich alpine flora, including species such as alpine roses. The terrain transitions from forested lower slopes to alpine meadows and rocky ridges near the summit. Wildlife in the Urner Alps includes typical mountain species such as chamois, marmots, and various birds of prey. The area around the Arnisee provides a unique habitat influenced by the presence of the reservoir.
Guides and organised ascents
For those seeking professional assistance, the Swiss Mountain Guides Association (SBV/ASGM), which is a member of the IFMGA/UIAGM, is the national authority. The Swiss Alpine Club (SAC/CAS) provides resources for mountaineers. Established guiding companies such as Zermatters and Bergsteigerschule Pontresina operate within Switzerland. A guided ascent typically includes professional instruction, route planning, and safety management, with costs depending on the duration, group size, and hut stays.
Safety and preparation
Climbing in the Urner Alps requires appropriate physical fitness, mountain experience, and proper equipment, especially for via ferrata routes. Hikers should always check local weather forecasts and carry essential gear, including navigation tools and first aid supplies. In case of an emergency, the direct line for Rega air rescue is 1414. Alternatively, 144 for ambulance services or 112 can be used to reach emergency services.
History and name
The mountain is known by several names, including Sunnig Grat, Sunniggrat, and Sunniggrätli. Historically, it has been a popular hiking destination in the Maderanertal region, valued for its panoramic views. The name Sonnengrat, meaning sunny ridge, appears in older geographical records of Switzerland, reflecting the mountain's favorable exposure.
Interesting facts
Sunniggratli is the 334th highest of 384 named peaks in the Urner Alps. Its nearest higher neighbor is Langchälengrätli, located 1.0 km to the west. The highest peak of the entire range, the Dammastock, lies 23 km to the southwest. The mountain is also notable for the Sunniggrathütte, which is situated just below the ridge at 1,978 m and features a small lake nearby.
FAQ
What is the elevation of Sunniggratli? The summit of Sunniggratli is 2,034 m above sea level.
Where is Sunniggratli located? It is located in the Urner Alps, within the municipality of Gurtnellen, Switzerland.
Are there huts on Sunniggratli? Yes, the Bergrestaurant Sunniggratli is located 410 m west of the summit.
How hard is it to climb Sunniggratli? The mountain offers via ferrata routes ranging from K1 (Emergency exit) to K4− (Adlerhorst), requiring appropriate climbing gear and experience.
How long does it take to climb? From Silenen, it takes approximately 2.5 to 4 hours to reach the top. From Bristen via the Waldnachtalp, it takes about 2.5 to 3 hours.
Is there mobile phone coverage? There are 13 communication masts within 10 km, with the nearest 1.9 km away. Coverage is generally good on the summit, but 112 should be used for emergencies. Download maps before setting out.
Is there water on the way? There is a small lake, Sunnig Grat Seeli, near the Sunniggrathütte. It is recommended to carry 1.5-3 litres of water for the day.