Hut to hut through the granite heart of Patagonia: your complete trekking guide to Bariloche's Nahuel Huapi Traverse

Bariloche is famous as a ski town, a chocolate town, and a lake district gateway. What it is not famous for, but absolutely should be, is as the base for one of the most rewarding hut-to-hut trekking circuits in the Southern Hemisphere.

The traverse linking Refugios Frey, Jakob, Laguna Negra, and López through the granite interior of Nahuel Huapi National Park takes 4 to 5 days. It crosses high passes with views across the lake district to the Chilean border. It traverses scree fields and boulder gardens. It passes glacial lagoons the colour of malachite. And it uses a system of mountain huts maintained by the Club Andino Bariloche, the oldest mountaineering club in Argentina, that offer bunk beds, hot meals, and cold beer at elevations between 1,700 and 2,000 metres.

The circuit is not technically difficult. It requires solid mountain fitness, experience reading terrain, and willingness to move through steep, loose rock without a formal trail in some sections. It rewards those things with a mountain experience that feels genuinely remote despite being accessed from a city of 130,000 people.

Why the Nahuel Huapi traverse is Patagonia's most underrated multi-day trek

The problem with Patagonia as a concept is that it has become synonymous with two places: Torres del Paine in Chile and El Chaltén in Argentina. Both deserve their reputations, Torres del Paine's W Trek and El Chaltén's Fitz Roy circuit are among the great mountain experiences in the world. But both are also heavily subscribed. The W Trek requires booking camping slots months in advance. El Chaltén's most famous viewpoints are reached by trails shared with hundreds of daily visitors in peak season.

The Bariloche refugio traverse has no lottery. No two-year advance booking window. No permit required. What it has is the Club Andino Bariloche hut network, book bunks at each refugio by phone or in person a week or two ahead in peak season, pay a nightly rate of approximately ARS 15,000–20,000 (USD 15–20 at 2026 exchange rates), and walk the connecting terrain between them in your own time.

The terrain itself is different from both Torres del Paine and Chaltén. Where Chaltén is granite spires above forests and glaciers, and Torres del Paine is lakeside trails through steppe, the Bariloche circuit is high-altitude scree and boulder country broken by glacial bowls. The granite of Nahuel Huapi's interior mountains, the Cerro Catedral massif and the ranges to the north, is rougher, more textured, and more intimate in scale than the monoliths of El Chaltén. The huts are the social hub; between them is a trackless mountain world.

The four refugios: Frey, Jakob, Laguna Negra, and López. what each offers

Refugio Frey (1,700m) sits beside a glacial lagoon at the base of the Cerro Catedral rock towers, a cluster of granite spires that Argentine and Chilean climbers use as a year-round training ground. The refugio is the most popular starting point for the traverse and the most established hut in the network, with a full kitchen, dorm beds, and a terrace that faces the lagoon and the towers. Getting there from Bariloche's ski base at Villa Catedral takes approximately 3 hours on a clear trail.

Refugio Jakob (1,600m) sits in the high Rucaco Valley above the tree line, surrounded by boulders and open alpine meadow. This is the most isolated refugio in the network, the approach from Frey crosses two passes with significant elevation gain and loss, and the connecting terrain is exposed. The hut is smaller than Frey and has a reputation among Argentine trekkers as having the best location: surrounded by nothing but granite and sky.

Refugio Laguna Negra (1,900m) is the highest hut in the network, perched above the dark lagoon that gives it its name. This is the most dramatic setting, a high-altitude bowl with views west toward Chile and south toward the Tronador massif. Reaching it from Jakob involves the Brecha Negra, a narrow ridge crossing at approximately 2,000 metres that requires careful footwork on loose rock and should be done in good weather.

Refugio López (1,620m) sits at the bottom of the descent from the high country, facing west over Lago Nahuel Huapi. From López, a 3-hour trail descends to the road and Bariloche. The position, above the lake, below the peaks. is one of the great mountain sunset views in the Argentine lake district.

Day-by-day route breakdown: Cerro Catedral to the Brecha Negra and beyond

Day 1 — Bariloche to Refugio Frey (3–4 hours). Take the gondola at Cerro Catedral ski resort to the upper station (saves 400m of elevation), then follow the trail northeast around the base of the Catedral towers to the lagoon. The trail is clear and well-marked. Arrive, check in, swim in the lagoon if you're brave (water temperature: approximately 8°C year-round), eat at the refugio. Sleep.

Day 2 — Frey to Jakob (5–7 hours). The hardest day of the traverse. From Frey, gain the Paso Castiglioni (2,000m) via steep scree, no clear trail in sections, cairn-marked where it exists. Descend into the Rucaco Valley and continue up the valley floor to the Paso de las Águilas, then down to Refugio Jakob. The terrain is serious mountain country; this day is not suitable for people without previous off-trail experience.

Day 3 — Rest or acclimatisation day at Jakob. Optional. The refugio's surroundings. upper Rucaco Valley, boulders, the small lake, reward a day of slow movement. Alternatively: a circuit to the Laguna Schmoll (2 hours each way), a glacial lagoon above the hut with granite towers all around.

Day 4 — Jakob to Laguna Negra via Brecha Negra (4–5 hours). The Brecha Negra is the crux of the traverse, a ridge crossing on scree and loose rock where the trail is marked by cairns and requires hands occasionally. The views from the Brecha are 360° mountain panorama. Descend to Laguna Negra and Refugio Laguna Negra. Shorter day, allowing time to appreciate the high-altitude setting.

Day 5 — Laguna Negra to Refugio López and descent to Bariloche (5–6 hours). From Laguna Negra, traverse west along high ridges to the López descent trail. Refugio López is 2 hours from Laguna Negra. The descent from López to the road takes a further 3 hours through beech forest. Bus or taxi from the trailhead back to Bariloche.

The terrain reality: rock scrambles, scree, loose trails, and when it gets technical

This traverse is not technical climbing. You will not need ropes, harnesses, or any climbing equipment. But it is serious mountain terrain in several sections and should not be undertaken by people who are uncomfortable on steep, loose ground without a clear path.

The two most demanding sections:

• Paso Castiglioni (Frey to Jakob): Steep scree, approximately 200 vertical metres, no defined trail, cairn-marked. Takes 45–60 minutes. Descend on the far side is similarly loose.
• Brecha Negra (Jakob to Laguna Negra): A rocky ridge crossing with moderate exposure. The trail is narrower than the passes, some sections require using hands for balance on the rocks. Not suitable in wet or icy conditions.

Both sections are manageable for fit, experienced hikers who have done previous mountain terrain. Neither requires the assistance of a guide, but first-time Patagonia trekkers unfamiliar with reading terrain would benefit from going with someone who knows the route.

Weather changes rapidly in Nahuel Huapi. Days that begin clear can become cloudy and windy within hours. The Brecha Negra becomes significantly more dangerous in ice, avoid it before November and after April, or check conditions at the refugio the night before.

Booking refugio beds: The Club Andino Bariloche system and advance planning rules

All four refugios in the traverse are managed by the Club Andino Bariloche (CAB). Booking process:

• When to book: 1–2 weeks in advance in peak season (December–February). Earlier is better but rarely necessary outside Christmas–New Year and the Argentine summer holidays (January–February). Shoulder season (November, March–April) can often be arranged with 3–5 days' notice.
• How to book: CAB's website has an online booking form for some refugios; others (particularly Jakob) require a phone call or WhatsApp message to the refugio directly. CAB's office in Bariloche (Morales 437) can coordinate bookings for the full circuit.
• Rates: CAB member rates are approximately 30% lower than non-member rates. Annual membership is inexpensive and worthwhile for anyone staying multiple nights. Rates in 2026 are approximately USD 15–20 per person per night for a bunk, including breakfast and dinner at most refugios.
• Meals: Most refugios offer full board (dinner, bed, breakfast) which is strongly recommended, carrying 5 days of food on top of mountain gear adds significant weight.

What to pack for 5 Days in Nahuel Huapi (gear that earns its weight)

The terrain is above the tree line for significant portions of the traverse, meaning no shelter from wind and rain outside the refugios. Key items:

Footwear: Mid-weight hiking boots with ankle support and decent grip on wet rock. Trail runners are possible for experienced trekkers but the scree descents favour stiffer soles.

Layering: Wind-proof shell (wind is the primary weather challenge), insulating mid-layer (temperatures drop quickly above 1,800m after 3pm), moisture-wicking base layer. The refugios are warm inside; damp shell layers dry overnight in most conditions.

Navigation: The trails between refugios are not formally marked as trails — they are informal mountain routes maintained by regular trekker use and occasional cairns. Download the Wikiloc or Maps.me track for the traverse before leaving Bariloche. Carry a physical map of the park as backup. The APN (Administración de Parques Nacionales) provides a 1:50,000 topographic map of Nahuel Huapi at the park office in Bariloche.

Trekking poles: Strongly recommended for the scree descents.

Sleeping bag: The refugios provide blankets but a 400g sleeping bag liner or light bag is advisable for cold nights.

For connections to verified Patagonia trekking operators in Argentina who can organise the traverse with pre-booked refugio nights and a local guide if desired, Outer's Argentina network has you covered.

When to go and how weather can change everything above 2,000m

November to April is the trekking season. The refugios are typically open from October to May, with the busiest period December to February. The Brecha Negra can retain snow into November and occasionally October.

December–February: Peak season. Warmest, most stable weather. Most crowded. Book ahead.

November and March–April: Shoulder season. Fewer people, potentially cooler and windier, but outstanding conditions on good days. March in particular has excellent light for photography and noticeably thinner crowds.

May–October: The refugios close. The terrain above the passes holds snow and ice. The traverse is not appropriate without mountaineering experience and equipment.

The golden rule: trust the refugio staff's weather assessment for the Brecha Negra. They watch the conditions every day and know the difference between a grey morning that clears and a grey morning that doesn't. If they suggest waiting a day, wait a day.

Cover photo of Florian Deleé