Greater Patagonian Trail Section 19: Volcán Puyehue

The Greater Patagonian Trail Section 19: Volcán Puyehue is a challenging, multi-day point-to-point wilderness section in Chile's Los Lagos region, forming part of the 2,750 km Greater Patagonian Trail — one of South America's most significant long-distance hiking routes. With no marked trail, unbridged river crossings and a demanding ascent to an active volcanic crater, it is rated strictly for experienced, self-sufficient hikers comfortable navigating off-track across live geothermal terrain.

About the Greater Patagonian Trail Section 19: Volcán Puyehue

Section 19 of the Greater Patagonian Trail (GPT) is one of the most scenically and physically intense legs of the entire route. Known to thru-hikers as GPT19, it carries hikers through a surreal volcanic landscape in the heart of the Andes Lake District — a region still visibly shaped by eruption. The section is anchored by Volcán Puyehue, a stratovolcano that last erupted significantly in 2011 via the adjacent Cordón Caulle rift, blanketing the surrounding landscape in ash and pumice that hikers still cross today.

The Greater Patagonian Trail itself is a route of international significance, designated as part of the International Walking Network (IWN) — one of the world's most prestigious categories for long-distance routes. Created and curated by Jan Dudeck, the GPT is not a blazed trail in the conventional sense: it stitches together indigenous paths, cattle-drove roads, cross-country sections and optional river packrafting segments across more than 2,750 km of Chilean and Argentine Andes. Section 19 embodies this philosophy fully. There are no signposts, no staffed mountain huts, and no search-and-rescue infrastructure. Navigation is entirely by GPS track and printed topographic map.

The logical corridor of Section 19 connects the shores of Lago Ranco — specifically the small settlement of Riñiñahue on the lake's southern coast — northward through forest and farmland before ascending onto the volcanic plateau south of Puyehue, crossing a vast geothermal field, summiting the volcano crater, and descending to Anticura at the entrance to Puyehue National Park. This corridor passes through private farmland in its southern stages and protected national park territory managed by CONAF (Chile's national forestry agency) toward the finish.

Route Overview & Stages

GPT19 is almost universally walked south to north, from Riñiñahue on Lago Ranco to Anticura. This direction is strongly recommended: it puts the long valley approach behind you in the early days, rewards the difficult crater climb with a dramatic downhill finish into national park forest, and aligns with logistics — buses from Osorno serve Anticura far more reliably than the remote Lago Ranco shoreline. Walking the section in reverse is possible but meaningfully harder: the southern flanks of Volcán Puyehue are steeper and the descent becomes a taxing ascent.

The section splits naturally into four stages. Exact distances per stage depend on which route variant is followed — the GPT publishes both a standard hiking route (SH) and optional horse routes (OH) — and conditions on the volcanic plateau can add substantial time regardless of kilometres on the map.

A practical judgement on the ascent: Hikers who have completed GPT19 and documented their experience on WikiExplora consistently report that staying approximately 200 metres to the right of the GPS-indicated ascent line makes the climb to the crater measurably less steep. This is worth loading into your GPS before you leave the plateau. Plan your summit push with a 06:00 departure from high camp — the crater can be reached by mid-morning, well before the afternoon cloud that frequently obscures visibility on the rim. A full circuit of the crater adds roughly one hour but is strongly worth it on a clear day.

Highlights & Points of Interest

• Volcán Puyehue Crater (approx. 2,236 m): The defining feature of the section — a vast, still-active crater with panoramic views across the Andes Lake District on clear days. The southern summit is the highest accessible point. A full tour around the crater rim reveals dramatic contrasts between the glaciated north and the barren, steaming south-facing wall.
• Geothermal Plateau: The high plateau south of the summit is one of the GPT's most extraordinary environments: fumaroles vent steam through hardened lava, the ground is measurably warm in places near active vents, and the absence of all vegetation creates a disorienting lunar quality. Tread with care — the volcanic crust can be thin near vent areas.
• 2011 Cordón Caulle Lava Fields: The June 2011 eruption of the adjacent Cordón Caulle rift system was one of the most significant volcanic events in modern Chilean history, forcing the evacuation of nearby towns and blanketing Argentine Patagonia in ash. The lava fields traversed on GPT19 are a visceral, still-fresh record of that event — black, fractured basalt stretching across the plateau.
• Lago Ranco Shoreline (Riñiñahue): The southern trailhead sits at one of Chile's largest lakes, framed by native lenga beech forest. Riñiñahue is a tiny community with minimal facilities, but the lake views on departure morning set the tone for the wilderness ahead.
• Tabaño Insect Belt (Approach Valleys): A notorious GPT feature. The Andean tabaño (horse fly) is aggressive and persistent below the treeline in summer, particularly in the sheltered river valleys of the approach stages. Ascending onto the volcanic plateau brings instant, welcome relief. Carry a head net — it is not optional on this section.
• Water Gap Between Homestead and Mid-Descent: One of the section's defining logistical challenges. From the last homestead on the approach, there is no reliable water source until partway down the northern descent of Volcán Puyehue, where melting snow may be found — though this cannot be counted on in low-snow years. Carry minimum 3 litres from the homestead.
• Puyehue National Park — Anticura Sector: The northern finish drops into the protected Anticura sector of Puyehue National Park, a CONAF-managed area with a ranger post, a basic campsite and marked interpretive trails. The contrast with the trackless volcanic wilderness above is immediate and reassuring.
• Termas de Puyehue (off-route): Located on Route 215 near the Anticura exit, the thermal bath complex at Puyehue is a beloved post-section reward. Commercial facilities include pools fed by natural geothermal water from the same volcanic system you have just traversed on foot.

Best Time to Hike the Greater Patagonian Trail Section 19: Volcán Puyehue

GPT19 is strictly a southern hemisphere summer route. The viable window runs from mid-December through late March, with the peak months being January and February. Of the two, January is the single best month to hike this section: the volcanic plateau is reliably free of deep snow, river levels have dropped from their November–December snowmelt peak, and the long southern summer days give maximum flexibility for summit timing. As of 2026, access conditions follow the pattern below:

• November – early December: The plateau may still carry deep, unconsolidated snow, making GPS navigation and route-finding genuinely hazardous. River crossings from active snowmelt are at their most dangerous. Not recommended unless you have confirmed mountaineering experience with snow travel and have checked current snow conditions via local sources in Osorno.
• January (recommended): Optimal window. Reliable snow-free access to the plateau, lower river levels, longest daylight, and tabaños have not yet reached peak density. Book any accommodation near Lago Ranco or in Osorno well in advance — Chilean summer holidays (January–February) drive high demand on the Lakes District.
• February: Very good conditions for most of the month, though tabaño populations peak and summer convective storms can raise river levels rapidly. A safe window for prepared hikers; carry an extra weather buffer day in your food plan.
• March: Feasible in early March. Increasing risk of early autumn rain events and the possibility of fresh snowfall returning to the upper crater by month's end. River crossings become unpredictable after the first significant autumn rain. Exit by mid-March to be safe.
• April – November: Section inaccessible due to snow depth and unsafe crossing conditions. Do not attempt outside the summer window.

One important caveat applies year-round: the Puyehue-Cordón Caulle volcanic complex is actively monitored by SERNAGEOMIN, Chile's national geology and mining service. Volcanic alert levels can change on short notice. Check the current alert status before departure and register your intended route with CONAF rangers at Anticura upon arrival.

Practical Information

Accommodation

GPT19 is a full wilderness section — there are no staffed mountain huts, commercial refugios or organised campsites between the Riñiñahue trailhead and the Anticura finish. Hikers must carry a tent and sleeping kit rated to at least −5°C for the entire section, plus a food buffer of one to two extra days for weather delays.

Before the section, Osorno is the main service hub. The city offers a range of hostels at approximately €15–25 per night for a dorm bed and mid-range hotels from €50–80. Riñiñahue on Lago Ranco has very limited sleeping options; local cabañas can occasionally be arranged informally for approximately €20–30 per person per night — enquire on arrival. At the Anticura finish, CONAF operates a basic campsite with toilet facilities at approximately €5–8 per tent pitch. There are no food resupply points between Riñiñahue and Anticura.

Getting There & Back

The nearest major airport is Puerto Montt (PMC), approximately 210 km south of Osorno. Regular buses connect Puerto Montt to Osorno in around 2 hours. Osorno is the staging city for the section and is well-served by long-distance buses from Santiago (approximately 10–12 hours).

From Osorno to Riñiñahue (southern trailhead): take a bus to Río Bueno — departures run approximately every 30 minutes from Osorno's terminal. From Río Bueno, connect to the Lago Ranco shore; some direct connections exist, though frequency is limited. Local transport for the final stretch to Riñiñahue itself is scarce and may require a pre-arranged taxi or a lift from the village. Allow half a day for this approach and confirm current bus schedules locally before committing to your start date.

Return from Anticura to Osorno: Route 215 — the international highway connecting Osorno to Bariloche, Argentina — runs directly past the Anticura park entrance. Regular buses between Osorno and the Argentine border stop at Anticura; the journey to Osorno takes approximately 1.5–2 hours. Bus frequency on this route is substantially higher than on the southern approach, making Anticura a more straightforward logistical exit point. This is another reason to walk the section south to north.

Permits & Fees

No advance permit is required for the wilderness stages of GPT19 that cross private land. However, the route does pass through private farmland during the southern approach, and the GPT community's access to this land depends on continued goodwill with local landowners. Follow GPT protocol strictly: close all gates behind you, do not camp on farmland without explicit landowner permission, and approach locals respectfully. The GPT association charges no trail fee but requests that hikers register their hike via the WikiExplora platform before departure.

Entry to the Anticura sector of Puyehue National Park at the trail's northern finish requires a CONAF entrance fee. As of 2026, the standard rate for foreign visitors is approximately 5,000–6,000 CLP (roughly €5–6). Chilean residents pay a reduced rate. Fees are collected at the Anticura ranger station.

Volcanic risk monitoring: Before departure, check the alert status for the Puyehue-Cordón Caulle complex on the SERNAGEOMIN volcanic monitoring portal. Alert levels are updated in real time and access to the upper volcanic terrain may be restricted at Yellow (Amarillo) alert level or above.

Gear & Packing List

GPT19 demands a gear list calibrated for sustained volcanic wilderness: self-sufficient for 5–7 days, able to withstand Patagonian weather extremes, and durable enough for repeated river crossings and off-trail travel on abrasive lava. Navigation hardware is non-negotiable — download the GPT19 track files from the WikiExplora GPT19 page to your GPS device before leaving Osorno. Do not rely solely on a smartphone.

For pack selection, volume and carry comfort matter more than chasing minimum weight on a section with this level of river crossing and volcanic terrain. The Osprey Aether 65 is a well-proven choice for the full multi-day load GPT19 requires — its frame and suspension handle heavier food carries well across uneven ground. For hikers committed to an ultralight approach with the experience to justify a smaller kit, the Zpacks Arc Blast 55L offers generous capacity with a substantial weight saving. A strong midpoint is the Hyperlite Mountain Gear 3400 Windrider: its Dyneema Composite Fabric construction is effectively waterproof without a rain cover — a genuine operational advantage when river crossings and Patagonian squalls are daily realities. For a full weight-to-capacity comparison before you buy, see our Best Ultralight Backpacks 2026 roundup.

Essential items beyond a standard backpacking kit:

• GPS device with GPT19 track files loaded: A dedicated GPS device is strongly preferable to a phone over 5+ days in the field. Battery management on a phone under continuous GPS tracking is a genuine problem in the volcanic plateau's cold nights.
• Trekking poles: Mandatory. The multiple unbridged river crossings and the loose volcanic scree on both ascent and descent make poles essential rather than optional.
• Crampons or microspikes: Carry from December through late January for the upper crater sections, where snow patches persist on the gravel. Not needed in February or March in most years.
• Hardshell rain jacket and over-trousers: A hardshell, not a softshell, for crater-level exposure. Patagonian weather can deteriorate within hours.
• Insect head net: Sounds excessive until the tabaños find you in the approach valleys. Carry it.
• Water filter and minimum 3-litre carry capacity: The water gap between the last homestead and the mid-descent spring on Volcán Puyehue's north face is GPT19's most-cited logistical pinch point. Fill to capacity at the homestead.
• Food for 7 days: Build in two buffer days for weather. Calculate your daily caloric needs carefully — off-trail volcanic terrain burns substantially more energy than walking a marked path. Our guide on how many calories you need hiking a full day provides a useful baseline for planning your food weight on a demanding multi-day section like this.
• Emergency bivouac layer and first-aid kit: Self-rescue is the only option on GPT19. Carry a lightweight emergency bivy and a first-aid kit that includes blister management, pain relief and an ace bandage for ankle support on the volcanic rock descent.

Similar Trails You Might Like

The Greater Patagonian Trail has several other volcano-centred sections that share GPT19's wilderness character and demanding navigation style. If Volcán Puyehue is your introduction to the GPT, the sections below make natural next challenges — or form part of a longer thru-hike connecting Chile's volcanic spine south to north.

• Greater Patagonian Trail Section 6: Volcán Descabezado — a technically demanding section in the Maule region, centred on the flat-topped Descabezado Grande volcano and its high-altitude, cross-country approach through remote backcountry
• Greater Patagonian Trail Section 8: Volcán Chillán — threading through the active Nevados de Chillán volcanic complex in the Biobío region, with natural thermal springs and challenging off-route navigation across shifting snow and ash terrain
• Greater Patagonian Trail Section 9: Volcán Antuco — anchored by the near-perfect cone of Volcán Antuco and the turquoise expanse of Laguna del Laja, this section is considered one of the GPT's most scenically striking middle sections and offers slightly more accessible terrain than GPT19

Frequently Asked Questions

When is the best time to hike Greater Patagonian Trail Section 19: Volcán Puyehue?

January is the single best month. The hiking window is mid-December through late March, but January offers the most reliable conditions: the volcanic plateau is typically snow-free, river levels from spring snowmelt have dropped, and southern hemisphere daylight hours are at their longest. February is also viable but brings higher tabaño insect activity and increased summer storm risk. Avoid anything outside the December–March window — the section is unsafe in snow and high water outside this period.

How difficult is GPT Section 19: Volcán Puyehue?

It is an expert-level wilderness route. Difficulty comes less from sustained technical climbing and more from cumulative challenges: GPS-only navigation with no waymarkers, multiple unbridged river crossings that vary from ankle-deep to waist-deep, a long water gap on the volcanic plateau, unpredictable Patagonian weather, and a loose volcanic rock ascent to the crater. Previous wilderness navigation experience and GPS competency are prerequisites. This is not a beginner or intermediate trail.

How many kilometres per day should I plan for on GPT19?

Plan for lower daily distances than on a conventional marked trail. The volcanic plateau's loose pumice and ash, combined with river crossing delays and navigation pauses, makes 10–15 km per day a realistic target for strong, experienced hikers. The crater summit day is particularly demanding relative to distance covered — plan for an early 06:00 start to reach the rim before midday clouds reduce visibility. Allow 5–7 days total for the full section including buffer days.

Is there any accommodation along GPT Section 19?

No. There are no staffed huts, commercial refugios or organised campsites between the Riñiñahue trailhead and the Anticura finish. Hikers must carry a tent, sleeping kit rated to −5°C and all food for the entire section. A small CONAF campsite at Anticura (approximately €5–8 per pitch) serves as the finish-point base. The nearest hostel accommodation is in Osorno, roughly 1.5–2 hours by bus from Anticura on Route 215.

Do I need a permit to hike GPT Section 19: Volcán Puyehue?

No advance permit is required for the wilderness stages. The northern finish inside Puyehue National Park requires a CONAF entrance fee (approximately €5–6 for foreign adults as of 2026), payable at the Anticura ranger station. The route crosses private farmland in the south — follow GPT etiquette, close all gates, and seek landowner permission for camping on private land. Always check the SERNAGEOMIN volcanic alert status before departure; access to the upper volcanic terrain may be restricted at elevated alert levels.