Location and surroundings
Sex Blanc belongs to the chain Central European Highlands > Alps > Western Alps > Northwestern Alps > Savoy Prealps > Giffre Mountains. It is in Switzerland, in the canton of Valais/Wallis, and administratively in the municipality of Val-d'Illiez and the district of Monthey. At 1,698 m, it is a lower summit in a region of much higher Alpine peaks, with open ridges, steep slopes and nearby summits rising quickly around it.
The mountain sits in the western Swiss Alps close to the French border zone of the wider range. In the Giffre Mountains it is far from the top end of the height list, which fits the local landscape: a mix of pre-Alpine ridges, grassy slopes and rocky tops rather than a single dominant summit.
Neighbouring peaks
The closest named summits and passes around Sex Blanc are:
- Signal de Soi — 2,054 m, 0.5 km south
- Crète du Dardeu — 2,302 m, 1.6 km southeast
- Dent de Valère — 2,267 m, 2.0 km east
- Tinderray — 2,134 m, 2.4 km south
- Pointe de l'Erse — 2,032 m, 2.7 km northeast
- Tête de Chalin — 2,596 m, 2.9 km southeast
- La Cathédrale — 3,160 m, 2.9 km southeast
- La Forteresse — 3,164 m, 2.9 km southeast
The nearest higher peak is Signal de Soi, only 0.5 km to the south and 356 m higher. Several other neighbours are also clearly higher, especially to the southeast, where the terrain rises toward the main ridge of the range.
The view from the summit
From Sex Blanc, the highest peaks listed within 25 km show how quickly the Alps rise away from this part of Valais. To the south are Haute Cime (3,257 m, 3.5 km), Tour Sallière (3,220 m, 7.2 km), Pointe d'Orny (3,271 m, 23.3 km) and the Aiguille du Tour group farther south. The highest named summit is Aiguille du Tour at 3,542 m, 23.1 km south.
Other high points in the wider view include Aiguille de la Varappe (3,518 m, 25.0 km south) and Aiguille du Passon (3,370 m, 24.9 km south). The main pattern is a southward wall of higher Alpine summits, with the nearest major high ground concentrated in the same direction.
The range
Sex Blanc is part of the Giffre Mountains, a range that spans France and Switzerland. The highest peak of the range is Haute Cime at 3,257 m, about 3 km south of Sex Blanc. The range contains 235 named peaks, and Sex Blanc ranks 209th by elevation among them.
This places it near the lower end of the range’s height spectrum. The Giffre Mountains include much higher summits and a compact Alpine relief, so Sex Blanc is best seen as one of the smaller named tops in a larger pre-Alpine mountain system.
Climate and weather
Climate estimates from NASA POWER data for 2001–2020 suggest that the summit is warmest in July, at about 13 °C, and coldest in January, at about -7 °C. Mean temperatures are above freezing at the summit from April to October. The surrounding area receives about 1,150 mm of precipitation a year, with the wettest month in May at about 115 mm and the driest in February at about 75 mm.
In this part of the Alps, weather can change quickly, with fog, rain, snow at higher levels and strong winds on exposed ridges. Even in the warmer months, cold mornings and wet ground are common, and early-season snow patches can linger on shaded slopes.
Best time to visit
The months with mean temperatures above freezing at the summit are April, May, June, July, August, September and October, so the practical season is mainly late spring to early autumn. For drier conditions, February is the least wet month in the surrounding area, while May is the wettest. For walking or easy ridge travel, the most comfortable period is usually the warmer part of summer, when snow cover is most likely to be limited.
Outside that window, expect colder conditions, wetter ground and a higher chance of snow or ice on the upper slopes. In the Alps, shoulder seasons can still be suitable for experienced hikers, but they demand more caution and better equipment.
Nature and wildlife
The slopes around Sex Blanc are typical of the western Swiss Alps: grassland and alpine pasture lower down, then rockier ground, sparse vegetation and exposed ridges higher up. At 1,698 m, the mountain sits near the upper limit of many subalpine plants, with hardy grasses, herbs and low shrubs on open ground.
Wildlife in this region can include chamois, ibex, marmots and mountain birds, depending on season and disturbance. In summer, livestock may also be present on grazed slopes. The terrain is generally open enough that animals are often seen at a distance rather than close by.
Guides and organised ascents
For a mountain like Sex Blanc, a certified guide is usually worth considering if you are unfamiliar with Alpine terrain, route-finding or changing mountain weather. In Switzerland, guides are trained through the Swiss Mountain Guides Association (SBV/ASGM), an IFMGA/UIAGM member. The main alpine club is the Swiss Alpine Club (SAC/CAS), which is a common starting point for mountain information and local contacts.
Visitors in Switzerland also use established guiding companies such as Zermatters and Bergsteigerschule Pontresina (Go Vertical Mountain Guides) as examples of professional mountain services in the country. A guided outing usually depends on the number of days, group size, hut nights and equipment needs. For local advice, tourist offices in the Valais area and the national guide association are sensible places to ask.
Safety and preparation
Sex Blanc is not a high summit by Alpine standards, but the terrain still calls for mountain fitness, sure footing and attention to weather. Steep grass, loose ground, wet rock and sudden cloud can make even moderate heights feel serious. Good footwear, layers, map knowledge and an early start are sensible basics, especially if snow remains on the upper slopes.
For mountain rescue in Switzerland, the direct emergency number is 1414 for Rega air rescue. 144 for ambulance and 112 also work. In an emergency, call as soon as possible and give your location, condition and weather situation clearly.
Interesting facts
Sex Blanc is 209th highest among the 235 named peaks of the Giffre Mountains, so it sits well below the range’s main summits. The nearest higher peak is Signal de Soi, just 0.5 km away to the south. The range high point, Haute Cime, is about 3 km south and rises to 3,257 m.
The mountain also sits in a cross-border range shared by France and Switzerland. That makes it part of a broader Alpine landscape where local ridges can be modest in height but still connect to much larger summits nearby.
FAQ
How high is Sex Blanc? It rises to 1,698 m.
Where is Sex Blanc located? It is in Switzerland, in the canton of Valais/Wallis, within the municipality of Val-d'Illiez and the district of Monthey.
Which mountain range does Sex Blanc belong to? It is in the Giffre Mountains, part of the Savoy Prealps and the wider Alps.
What are the nearest higher or nearby peaks? The nearest higher peak is Signal de Soi, 0.5 km south. Other close neighbours include Crète du Dardeu, Dent de Valère and Tinderray.
Is there water on the way to Sex Blanc? On open Alpine slopes, water sources are often limited and can be seasonal. Carry enough for the day, usually about 1.5 to 3 litres depending on heat and route length, and treat any snowmelt or natural water before drinking.
How long does it take to reach Sex Blanc? Plan from the map, height gain and terrain rather than a fixed estimate. The real time can be longer on steep or rough ground.
Will my mobile phone work there? Coverage in the hills is patchy and depends on the operator. On open ground a signal is more likely, while it often fails in valleys or behind ridges. Call 112 for emergency services over any available network, and download maps before setting out.