Via Alpina Yellow B31

The Via Alpina Yellow B31 is a point-to-point mountain stage in South Tyrol, Italy, climbing from the Schnals Valley monastery village of Karthaus (1,327 m) to the Similaunhütte on the Italian-Austrian border at 3,019 m — a net elevation gain exceeding 1,690 m. Stage distance is not published by the operator. Rated challenging by Alpine standards, this International Walking Network stage is one of the most dramatic high-altitude days on the entire Yellow route.

About the Via Alpina Yellow B31

Stage B31 of the Via Alpina Yellow route threads through the heart of the Ötztal Alps, a range straddling the border between South Tyrol (Italy) and the Austrian Tyrol. The Yellow route is one of six long-distance trails that together span the Alps, and B31 represents one of its highest and most historically charged stages.

The stage begins in Karthaus (Certosa di Senales), a compact village in the lower Schnals Valley (Schnalstal / Val Senales) at 1,327 m. The valley takes its name from the Carthusian monastery — Certosa di Monte Maria — that has defined the settlement since the 14th century. From here the route ascends steadily northward through a textbook Alpine valley: meadows and larch forest give way to a glacier-fed reservoir, then a ski-resort headwall, and finally glacial moraine leading to the Similaunhütte (Rifugio Similaun) at 3,019 m on the Niederjoch ridge.

The hut sits adjacent to the Hauslabjoch (Tisenjoch, approx. 3,210 m) — the ancient border pass that gained worldwide attention in September 1991 when two German hikers discovered the 5,300-year-old Copper Age glacier mummy Ötzi just 92 m inside the Italian border. That discovery transformed the Schnalstal into one of the most historically significant hiking corridors in the Alps.

Expert recommendation: Walk B31 from Karthaus to Similaunhütte — south to north — rather than in reverse. The prevailing light falls better on the glacial terrain when heading north in the afternoon, and overnight accommodation is far easier to secure at the Similaunhütte than at any self-catering point above the reservoir. More critically: do not skip the acclimatisation opportunity at Kurzras (Maso Corto, 2,011 m). If you are arriving from lower elevations, an overnight in Kurzras before tackling the final 1,000 m to the hut measurably reduces altitude-related fatigue and risk. Book the Similaunhütte no later than six weeks ahead for July and August — glacier-circuit day-trippers from Kurzras fill its dormitory bunks fast, and there is no alternative shelter above 2,700 m on this route.

Route Overview & Stages

The Via Alpina operator does not publish per-segment distances for B31. The table below identifies the four logical route sections with verified elevations and terrain character. Use it to pace your day, not as GPS data.

The steepest and most demanding section is the final push from Kurzras to the hut. Above 2,600 m, the trail transitions from moraine paths to glacially polished rock. Crampons are not required in high summer (July–September) when the standard marked route is clear, but microspikes are advisable in early July and after unseasonal snowfall. The Similaunhütte warden provides current conditions on request before you depart Kurzras.

Highlights & Points of Interest

• Certosa di Senales (Karthaus Charterhouse, 1,327 m): The 14th-century Carthusian monastery at the trailhead is one of the oldest in the Alps. The austere stone complex set against the valley walls makes for a striking departure point, underscoring that the Schnalstal has been a pilgrimage corridor for seven centuries.
• Texel Group Nature Park (Gruppo di Tessa): The lower third of B31 passes through South Tyrol's largest protected area, covering 33,000 hectares of Alpine and sub-Alpine terrain. The park's charter restricts motorised access to the main valley road, keeping trail corridors genuinely quiet even in peak season.
• Unser Frau in Schnals (Madonna di Senales, ~1,500 m): A compact bilingual village with a late-Gothic church. This is the last reliable food and supplies stop before the reservoir; stock up here as the next shop is in Kurzras, several kilometres further up the valley and considerably higher.
• Vernagt Reservoir (Lago di Vernago, 1,705 m): The glacier-fed reservoir backs up behind a 1970s hydroelectric dam. The walk along its shoreline is flat and fast, with the first sustained views of the Similaun Group glaciers opening ahead. Trail no. 15 branches steeply upward from the dam wall toward the upper valley.
• Kurzras / Maso Corto (2,011 m): The valley-head ski resort is the last place to eat a hot meal before the final Alpine push. Several mountain hotels accept through-hikers. The Gletscherstraße bus terminates here, making Kurzras both a recommended acclimatisation stop and a practical bail-out point if conditions deteriorate above.
• Schnals Glacier (Ghiacciaio di Senales): Above Kurzras the glacier dominates the skyline. The B31 route skirts its lower margin; glacial retreat has been dramatic over recent decades, and the exposed moraines left behind form visually compelling, if unstable, terrain that demands careful footing.
• Ötzi Discovery Site, Hauslabjoch (Tisenjoch, ~3,210 m): The Copper Age mummy found here in 1991 rewrote prehistoric Alpine history. A memorial marker identifies the exact location, 92 m inside Italian territory, reached via a short detour from the Similaunhütte along the border ridge.
• Similaunhütte / Rifugio Similaun (3,019 m): The B31 endpoint is a classic Alpine hut operated by the German Alpine Club (DAV, Sektion Hanau). Perched on the Niederjoch ridge with 360° views across the Ötztal Alps into Austria, it is among the most atmospherically positioned huts in the Eastern Alps.

Best Time to Hike the Via Alpina Yellow B31

The practical hiking window for B31 runs from early July to late September. Snow lingers on the upper approaches through June, and the Niederjoch route can carry hard névé that makes the final section hazardous without ice-axe experience. The hut typically opens in late June and closes by mid-October depending on conditions.

As of 2026, the single best month to hike B31 is August. Snowpack has fully consolidated, the trail is dry and well-signed from trailhead to hut, and the Similaunhütte operates at full capacity with hot meals served 08:00–19:00. Weather windows in the Ötztal Alps average 6–8 stable days per stretch in August — the best ratio of the entire season.

July offers cooler temperatures and lighter crowds in the lower valley, but early July still carries significant snow risk above 2,500 m. Always check current conditions with the hut by phone before departing Karthaus. September brings the clearest skies and the most dramatic photography light of the season, and trail traffic drops sharply after the first week, but the hut closes progressively earlier in the month and daylight at altitude shortens noticeably by mid-September.

Thunderstorm season peaks in July and early August. Start early — leave Karthaus no later than 07:00 — so the exposed glacial terrain above 2,700 m is covered before midday convective activity builds. There is no shelter on the upper route once you leave Kurzras behind.

Practical Information

Accommodation

The primary overnight stop on B31 is the Similaunhütte (Rifugio Similaun) at 3,019 m. Operated by DAV Sektion Hanau, it offers Matratzenlager (dormitory) bunks and a small number of private double rooms. Expect to pay approximately €38–45 per person for a dormitory bunk with half-board (Halbpension), the standard Alpine hut arrangement. The hut holds around 80 guests and fills rapidly from late July through August due to its connection to the Ötzi site and glacier day-trippers from Kurzras. Book at least six weeks ahead for July and August.

Walkers splitting the stage or spending a night to acclimatise will find several three-star mountain hotels in Kurzras (Maso Corto, 2,011 m). Expect €70–120 per person for bed and breakfast. The village also has a small supermarket open through the summer season.

In the lower valley, farmhouse accommodation (Urlaub am Bauernhof) in Unser Frau in Schnals and Karthaus runs approximately €45–65 per person with breakfast — practical for walkers arriving by public transport who want a head start the following morning.

Getting There & Back

The trailhead at Karthaus is reached via the Schnalstal bus from Naturns (Naturno), which connects to the Vinschgau rail line. From Merano (Meran), take the regional train to Naturns (approximately 30 minutes) then the Schnalstal bus to Karthaus (40–55 minutes). Merano is connected by rail to Bolzano (Bozen), which is reachable from Innsbruck in 75 minutes and from Verona in 90 minutes.

From the Similaunhütte at trail end, the standard descent returns to Kurzras, from which the Gletscherstraße bus runs several times daily to the valley bottom and connects onward to Naturns. Check current seasonal timetables with Südtirol Mobil before travel, as schedules change between high summer and shoulder season.

The nearest international airports are Innsbruck Airport (INN), approximately 90 km from Karthaus by road, and Verona Villafranca (VRN), approximately 220 km south. Innsbruck is the more convenient option for walkers arriving from the north; car hire is available at both airports.

Permits & Fees

No hiking permit is required for Stage B31. The trail passes through the Texel Group Nature Park (Gruppo di Tessa), which has free public access on all marked trails. The park prohibits bivouacking outside designated camping areas, so overnight walkers must use the hut system — there is no legal wild camping option on the upper route.

The Similaunhütte charges standard DAV hut rates. DAV and SAC members receive a discount of approximately 30–40% off listed prices, which can offset the membership cost on any multi-stage Via Alpina itinerary. Membership is not required to stay at the hut.

Gear & Packing List

B31 crosses glacial terrain above 2,800 m and demands more than a standard day-hike setup. The central challenge is carrying a sleeping liner, down layer, and emergency kit across a long approach valley without exhausting yourself before the technical section begins. Aim for a 28–45-litre pack with a loaded weight under 10 kg.

Ultralight fabrics handle the upper terrain well. The Hyperlite Mountain Gear Aero 28 at 536 g uses Dyneema Composite Fabric that sheds light rain without a separate waterproof liner — a meaningful weight saving on a stage this long. The Hyperlite Mountain Gear 2400 Windrider at 510 g offers the same material in a slightly different volume, well suited to faster hikers carrying a leaner kit. For those who prefer a structured suspension on a heavier load, the Deuter Aircontact Lite 45+10 at 1,570 g earns its weight on over 1,600 m of ascent with a ventilated back panel and adjustable torso fit.

For calorie planning on a stage with this much vertical gain, the HikeLoad guide to daily calorie needs is a useful baseline — most hikers underestimate consumption at altitude by 20–30%.

• Navigation: Kompass Map 1:25,000 (sheet 43, Schnalstal) or a downloaded GPX of the Via Alpina Yellow route. The route is well-waymarked below 2,500 m; above that follow the Alpine Club yellow-red-yellow paint markers closely.
• Footwear: Stiff-soled hiking boots with ankle support. Trail runners work on the valley section but are inadequate for glacially polished rock above Kurzras.
• Layers: Even in August the ridge at 3,019 m routinely drops below 10 °C in late afternoon. Carry an insulated jacket and a waterproof hardshell regardless of the morning forecast.
• Microspikes: Optional in peak summer, prudent in early July and after unseasonal snowfall. The Similaunhütte warden will advise on current conditions from Kurzras.
• Sun protection: UV intensity is high above 2,500 m. SPF 50+, glacier glasses (Category 4 lenses), and a brimmed hat are non-negotiable above the reservoir.
• Water: Streams are plentiful on the lower half of the route. Above the glacial moraine, carry a filter or treat water before drinking — sources above 2,600 m are less reliably clean.

Similar Trails You Might Like

B31's combination of a deep valley approach and a high Alpine hut finish is a format shared by exceptional multi-elevation routes worldwide. If you are drawn to intense single-day crossings between two radically different elevations, the Theth to Valbona traverse in Albania delivers a comparable physical challenge at a fraction of the hut cost. For dramatic rim-to-depth or summit routes across different landscapes:

• South Kaibab Trail (United States, 9 km) — steep Grand Canyon descent with unobstructed ridge views throughout
• North Kaibab Trail (United States, 21 km) — the rim-to-river counterpart; pairs naturally with South Kaibab for a full point-to-point crossing
• Clouds Rest Trail (United States, 15 km) — Yosemite summit ridge with comparable exposure and panoramic scale to the Niederjoch approach
• Panorama Trail (United States, 8 km) — concentrated high-country scenery in a shorter format, good for days around B31
• Hidden Canyon (United States, 2 km) — compact canyon-wall introduction for those planning shorter stages

For gear planning across any of these routes, the HikeLoad roundup of sub-1 kg ultralight backpacks for 2026 covers the lightest tested options this season.

Frequently Asked Questions

When is the best time to hike the Via Alpina Yellow B31?

August is the single best month. Snow has cleared from the upper approaches, the Similaunhütte operates at full service with hot meals, and weather windows in the Ötztal Alps average 6–8 stable days per stretch. July is possible from mid-month but carries more snow risk above 2,500 m; September offers clearer skies but shorter days and an earlier hut closing date in mid-October.

How difficult is Stage B31 of the Via Alpina Yellow?

B31 is a serious mountain stage suited to experienced Alpine hikers. Net elevation gain from Karthaus (1,327 m) to the Similaunhütte (3,019 m) exceeds 1,690 m. No technical climbing or glacier crossing is required on the standard summer route, but terrain above 2,600 m is glacially exposed and demands careful footing. Altitude awareness is essential; acclimatise in Kurzras (2,011 m) if arriving from sea level.

How far is Stage B31 and how many kilometres per day should I plan?

Total stage distance is not published by the Via Alpina operator. Most walkers complete it in a single long day of 7–10 hours moving time, or split it with an acclimatisation overnight in Kurzras. Given the elevation gain, vertical effort matters more than horizontal distance — plan for six to eight hours of sustained uphill and depart Karthaus no later than 07:00 to avoid afternoon thunderstorms on the exposed upper ridge.

Do I need to book the Similaunhütte in advance?

Yes, and significantly in advance for peak season. The Similaunhütte (Rifugio Similaun) holds approximately 80 guests, and its connection to the Ötzi discovery site draws large numbers of glacier day-trippers from Kurzras who regularly take overnight bunks. Book directly through DAV Sektion Hanau at least six weeks ahead for July and August, and confirm the cancellation policy when booking.

Are there any permits required for Stage B31?

No permit is required. The trail passes through the Texel Group Nature Park (Gruppo di Tessa), which has free public access on all marked trails. Bivouacking outside designated areas is prohibited within the park, so overnight walkers must use the hut system. DAV or SAC membership is not required to hike or stay at the hut, but members receive a 30–40% discount on hut fees — worthwhile on a multi-stage Via Alpina trip.