Duration: Approximately 8 to 10 hours of narrated hiking Distance: 24 km (one way, Interlaken Harder Kulm to Brienz) Elevation Gain: 1,800 m cumulative ascent / 2,000 m cumulative descent Starting Elevation: 1,322 m (Harder Kulm) Ending Elevation: 566 m (Brienz) High Point: 2,344 m (Suggiture) Difficulty: T4-T5 (alpine hiking, exposed ridge, vertigo-free required) Best Season: July to September (snow-free conditions essential) GPS Start: 46.6925N, 7.8580E (Harder Kulm) GPS End: 46.7540N, 8.0290E (Brienz)
Introduction
Welcome to the Hardergrat, one of the most spectacular and demanding ridge walks in Switzerland. Over the next eight to ten hours, you will traverse a knife-edge ridge stretching 24 kilometres from Harder Kulm above Interlaken to the town of Brienz on Lake Brienz. This is not a casual day hike. The Hardergrat is a serious mountain undertaking that requires experience, fitness, a head for heights, and respect for the conditions.
The trail follows the entire length of the ridge separating the Brienzersee to the north from the Boedeli, the flat plain between Lakes Thun and Brienz, and eventually the Luetschine valley to the south. For most of its length, the ridge is narrow and exposed, with steep drops on both sides that can exceed 1,000 metres. Some sections are barely a metre wide, with nothing but air on either side.
Let me be clear about the demands of this trail. The Hardergrat is rated T4 to T5 on the Swiss Alpine Club scale, the second-highest difficulty for hiking trails. Several sections involve scrambling over rock with exposure to significant drops. Fixed ropes and chains are present in the most exposed passages, but not everywhere. The trail is poorly maintained in places, with loose rock and narrow paths along steep slopes. This hike should only be attempted by experienced mountain hikers who are comfortable with sustained exposure, have a strong head for heights, and are in excellent physical condition.
If any of these conditions give you pause, there are multiple escape routes along the ridge that descend to the lake or valley. There is no shame in turning back. The mountain will be here another day.
Essential equipment: sturdy mountain boots with excellent grip, trekking poles, helmet recommended for rockfall-prone sections, at least three litres of water, food for a full day, rain gear, warm layers, headlamp in case of delays, and a charged mobile phone for emergencies. Check the weather thoroughly before departing. This ridge must not be attempted in thunderstorms, high winds, fog, or when snow or ice are present.
Let us begin from Harder Kulm, which you have reached either by the funicular from Interlaken or on foot via the steep forest trail.
Waypoint 1: Harder Kulm (1,322 m)
GPS: 46.6925N, 7.8580E
Harder Kulm is the famous viewpoint above Interlaken, accessible by the Harderbahn funicular that has operated since 1908. The viewing platform here offers one of the most celebrated panoramas in the Bernese Oberland: Lakes Thun and Brienz spread out on either side of Interlaken, with the Eiger, Moensch, and Jungfrau rising majestically to the south.
The name Interlaken, meaning "between the lakes," perfectly describes the town's setting on the narrow strip of flat land between the two lakes. This alluvial plain, the Boedeli, was deposited by the Luetschine river over thousands of years. Interlaken has been a gateway to the Bernese Oberland since the mid-nineteenth century, when the first tourists arrived by steamer on the lakes.
From the restaurant terrace, look northeast along the ridge that stretches toward Brienz. That undulating, serrated line against the sky is your route for the day. It looks long because it is long. But each section brings new rewards.
The first few hundred metres of the trail are well-defined, heading northeast along the crest of the ridge. The forest of beech and spruce provides shade and shelter. Enjoy this relatively gentle start; the character of the trail will change significantly ahead.
Next waypoint: 1.5 km, approximately 30 minutes.
Waypoint 2: The Ridge Emerges (1,500 m)
GPS: 46.6945N, 7.8700E
As you gain elevation, the forest thins and the ridge begins to reveal its true nature. The trees give way to shrubs and meadow, and suddenly you can see the drops on both sides. To the north, the slopes plunge to the shores of Lake Brienz, over 1,000 metres below. To the south, the terrain falls away toward the Luetschine valley.
This is a good moment to assess your comfort level with the exposure. The sections ahead are significantly more exposed than this. If you feel anxious here, the terrain ahead will be more challenging, and it may be wise to consider turning back while it is still easy to do so.
The ridge is formed from Helvetic nappe limestone, a geological unit that has been thrust northward during the Alpine collision. The limestone here is relatively hard and resistant to erosion, which is why it forms this prominent ridge while the softer rocks on either side have been worn away. The sharp profile of the ridge is a product of frost weathering: water enters cracks in the rock, freezes, expands, and gradually splits the rock apart, maintaining the knife-edge profile over geological time.
You may notice a few paragliders launching from the slopes below. The Interlaken region is one of the world's premier paragliding destinations, with consistent thermal activity and spectacular scenery. From the ridge, you have a bird's-eye view of these colourful canopies drifting above the lakes.
Next waypoint: 2.0 km, approximately 45 minutes.
Waypoint 3: First Exposed Section (1,700 m)
GPS: 46.6968N, 7.8880E
You have reached the first truly exposed section of the Hardergrat. The ridge narrows to just a metre or two, with steep drops on both sides. Fixed cables are bolted into the rock on the most precarious stretches.
Move carefully and deliberately. Keep your centre of gravity low and use the cables where they are available. Plant your feet firmly before each step, and avoid looking down if you find the exposure unsettling. If you are using trekking poles, consider stowing them for the scrambling sections and relying on your hands for balance.
The exposure here is real and sustained. It is not technically difficult in a climbing sense, there is no climbing grade above easy scrambling, but the consequences of a slip are severe. This is what the Swiss Alpine Club means by the T4 and T5 grades: the difficulty lies not in the gymnastic challenge but in the sustained seriousness of the terrain.
Look north to Lake Brienz below you. The lake is 14 kilometres long, up to 260 metres deep, and fed by the Aare river and numerous mountain streams. Its distinctive turquoise colour comes from glacial sediment washed down from the mountains above Meiringen. The town of Brienz, visible at the eastern end of the lake, is famous for its tradition of woodcarving, which has been practised there since at least the seventeenth century.
Next waypoint: 2.5 km, approximately 60 minutes.
Waypoint 4: Augstmatthorn (2,137 m)
GPS: 46.7050N, 7.9050E
The Augstmatthorn is the first major summit on the ridge and one of the great viewpoints. At 2,137 metres, it is high enough to command views in every direction.
The summit is marked by a simple cross, and on clear days the panorama is extraordinary. The Bernese four-thousanders fill the southern sky: the Jungfrau, Moench, and Eiger are now seen from a north-facing perspective that reveals features hidden from the more familiar viewpoints to the south. The Schreckhorn, at 4,078 metres, is particularly impressive from here, its dark, jagged summit rising above the Grindelwald glaciers.
The Augstmatthorn is known among wildlife enthusiasts as one of the best locations in the Bernese Oberland to observe ibex. The Alpine ibex, Capra ibex, was hunted to near extinction in the Alps by the nineteenth century, surviving only in a small population in the Gran Paradiso region of Italy. A remarkable conservation effort, which included the controversial smuggling of ibex from Italy to Switzerland in the early twentieth century, has restored the population to over 17,000 animals in Switzerland alone. The Augstmatthorn ridge is home to a thriving colony, and sightings of these magnificent animals, with their huge, curved horns, are common.
If you have not yet eaten, this summit makes an excellent lunch spot, with flat rocks for seating and the most dramatic dining room view imaginable. Refuel well; the ridge ahead is long.
Next waypoint: 3.0 km, approximately 75 minutes.
Waypoint 5: The Tannhorn Section (2,100 m)
GPS: 46.7120N, 7.9230E
Between Augstmatthorn and the next major peak, the Tannhorn, the ridge continues its knife-edge character. This middle section is perhaps the most sustained stretch of exposed walking on the entire route.
The trail alternates between narrow ridge crest walking, where you are perched on top of the world, and traverses along the steep northern or southern flanks, where the path cuts across slopes of grass and rock. Some of these traverses are disconcertingly steep, and the path can be narrow and slippery, particularly on the north-facing side where moisture lingers.
The vegetation on the ridge crest is sparse but tenacious. Wind-pruned juniper and dwarf willows cling to the rocky soil, their branches shaped by decades of prevailing winds into bizarre, asymmetric forms. These plants grow incredibly slowly in these harsh conditions. A juniper bush barely twenty centimetres tall may be fifty years old.
Listen for the croaking call of the Alpine chough, a glossy black bird with a yellow bill and red legs. Choughs are supremely adapted to life at altitude and are often the only birds you will see on the highest ridges. They nest in rock crevices and gather in flocks of dozens or even hundreds, performing acrobatic displays on the updrafts along the ridge.
Take care in this section. There are a few places where the trail crosses loose scree on steep slopes, and the footing can be treacherous. Test each foothold before committing your weight.
Next waypoint: 2.5 km, approximately 60 minutes.
Waypoint 6: Suggiture (2,344 m)
GPS: 46.7200N, 7.9450E
You have reached the Suggiture, at 2,344 metres the highest point on the entire Hardergrat. This is the roof of the ridge, and the sense of elevation and isolation is profound.
Looking back to the southwest, you can trace the ridge all the way back to Harder Kulm, an undulating line that seems almost impossibly long and narrow from this perspective. You have covered roughly half the distance, and the hardest climbing is behind you, though significant exposure remains ahead.
From this altitude, the view to the south is commanding. The entire chain of the Bernese Alps is displayed, from the Wildhorn in the west to the Titlis in the east. Below, the Brienzersee appears as a narrow turquoise strip, its far shore lined with the villages of the Bernese Oberland: Iseltwald, Boenigen, and others.
The air at 2,344 metres is noticeably thinner than at the start. You are breathing air with roughly 75 percent of the oxygen available at sea level. If you feel slightly short of breath on the climbs, this is normal. Take your time, breathe deeply, and drink water regularly. Dehydration at altitude is more rapid than at lower elevations due to increased respiratory water loss and the typically dry mountain air.
Next waypoint: 2.0 km, approximately 50 minutes.
Waypoint 7: The Brienz Side Descent Begins (2,100 m)
GPS: 46.7280N, 7.9600E
Past the Suggiture, the ridge begins its long descent toward Brienz. The overall trend is downward from here, but there are still significant ups and downs as the trail crosses subsidiary peaks and saddles.
As you lose elevation, the vegetation returns. Alpenrose bushes appear first, their leathery leaves and pink flowers a welcome sign of gentler terrain. Then scattered larch trees, and gradually a more complete forest cover.
This section of the ridge offers views into the Rothorn area to the north, where the Brienz Rothorn railway, a steam-powered cog railway built in 1892, carries passengers to a summit station at 2,350 metres. If you look carefully, you may see or hear one of the heritage steam trains making its laboured way up the mountainside, trailing a plume of coal smoke. It is one of the last regularly operating steam cog railways in Switzerland.
The descent brings relief to tired legs but introduces new challenges. Downhill walking on rocky terrain is harder on the knees and ankles than climbing, and after hours on the ridge, fatigue can make your footing less sure. Consider using trekking poles for the descent sections if you have them. Keep a steady, controlled pace.
Next waypoint: 3.0 km, approximately 60 minutes.
Waypoint 8: Escape Route Junction (1,800 m)
GPS: 46.7350N, 7.9780E
At this saddle, there is a marked junction where a trail descends to the north, dropping to the lakeshore and the village of Oberried am Brienzersee. This is the last reliable escape route before the final section to Brienz.
Assess your condition honestly. It is now mid to late afternoon for most hikers. If you are exhausted, injured, or if the weather is deteriorating, the descent to Oberried is a wise choice. From Oberried, the lake steamer or bus will take you to Brienz or back to Interlaken. There is no disgrace in taking an escape route; experienced mountaineers know that good judgment is the most important skill in the mountains.
If you are in good condition and the weather is holding, the remaining section to Brienz is less exposed than the earlier ridge, though still demanding. You have roughly 6 kilometres and 1,200 metres of descent remaining, which will take approximately 2.5 to 3 hours.
Next waypoint: 2.5 km, approximately 50 minutes.
Waypoint 9: The Forest Descent (1,400 m)
GPS: 46.7420N, 7.9950E
The trail now enters dense forest on the descent to Brienz. After the exposure of the ridge, the forest feels sheltering and almost intimate. The dominant trees are beech and Norway spruce, with an understory of ferns and mosses.
The beech forests of the Swiss Alps have a special significance. In 2021, a group of ancient beech forests across Europe, including Swiss sites, were recognised as UNESCO World Heritage Sites. European beech, Fagus sylvatica, is the dominant broadleaf tree of central European forests, and old-growth beech stands are increasingly rare.
The forest here is steep, and the path zigzags down through it. The sound of running water increases as you descend, and you may cross several small streams. The air is rich with the scent of damp earth, mosses, and decaying leaves, the perfume of a healthy forest.
Your knees will be grateful for the rest when you reach the flatter sections lower down. Take short steps on the steep descents and bend your knees slightly to absorb the impact. If the path is muddy, as it often is in the shaded forest, step on rocks and roots rather than the slippery soil between them.
Next waypoint: 2.0 km, approximately 45 minutes.
Waypoint 10: Brienz Approach (800 m)
GPS: 46.7490N, 8.0150E
The forest gives way to meadows and orchards as you approach Brienz. The gradient eases, and you can see the red roofs of the town ahead, clustered along the shore of the lake.
Brienz is one of the most charming small towns in the Bernese Oberland. Its main street is lined with traditional wooden houses, many of them centuries old, their facades adorned with carved details and window boxes overflowing with geraniums. The town has been a centre for woodcarving since at least the 1600s, and the tradition continues today at the Swiss Woodcarving School, established in 1884, the oldest such institution in the country.
The Giessbach Falls, one of the most spectacular waterfalls in Switzerland, is visible across the lake from Brienz. The falls drop 400 metres in fourteen cascades, and are especially dramatic after heavy rain or during the snowmelt season.
Next waypoint: 1.5 km, approximately 25 minutes.
Waypoint 11: Brienz (566 m)
GPS: 46.7540N, 8.0290E
You have reached Brienz and the end of the Hardergrat trail. Congratulations. You have completed one of the most demanding and rewarding day hikes in Switzerland.
Closing
The Hardergrat is a trail that demands everything and gives everything in return. Over the past eight to ten hours, you have traversed 24 kilometres of alpine ridge, climbed and descended roughly 2,000 metres, crossed the highest point at 2,344 metres, and navigated terrain that tests nerve, skill, and endurance in equal measure.
From Brienz, trains run regularly to Interlaken, taking about 20 minutes. The lake steamer is a more scenic alternative when the schedule permits. If you have time, a meal at one of Brienz's lakeside restaurants, with a cold beer and a plate of roesti, is the perfect conclusion to a monumental day in the mountains.
Take care of your body in the coming days. A hike of this length and intensity takes a toll, and adequate rest, hydration, and nutrition are important for recovery.
Thank you for hiking with ch.tours. The Hardergrat is a trail that stays with you long after the muscle soreness fades. Safe travels, and we hope to guide you on your next Swiss adventure.