Greater Patagonian Trail Section 20: Volcán Antillanca

Greater Patagonian Trail Section 20: Volcán Antillanca is a point-to-point trail in Chile's Los Lagos Region, part of the International Walking Network — South America's longest through-route at over 3,000 km. Typically completed in 2 days, it crosses bamboo forest, volcanic scree, and crater-edge terrain between the CONAF Anticura area and Lago Rupanco, rated moderate to challenging with significant route-finding demands.

About the Greater Patagonian Trail Section 20: Volcán Antillanca

Section 20 of the Greater Patagonian Trail (GPT) is one of the route's most volcanically charged segments, threading through the Parque Nacional Puyehue corridor in Chile's Los Lagos Region. Named for Volcán Antillanca — part of the sprawling Puyehue-Cordón Caulle volcanic complex — the section connects the Anticura ranger sector of the national park with the shores of Lago Rupanco, one of the deepest lakes in South America.

The GPT itself, documented and maintained on Wikiexplora — the official GPT trail resource, spans more than 3,000 km from the Atacama Desert south to the Carretera Austral, making it the longest continuous hiking route on the continent and a certified route of the International Walking Network. Section 20 sits within the central Lakes District corridor, where Andean volcanoes, old-growth valdivian temperate rainforest, and glacial lakes converge under near-constant cloud and heavy rainfall.

This is not a trail for beginners. The route demands active navigation using a GPS device loaded with the official GPT tracks. Sections of the path become heavily overgrown with colihue bamboo — locally called quila — requiring sustained bushwhacking through the mid-elevation zone. Above treeline, widely spaced stone cairns and bamboo poles guide walkers across the austere volcanic plateau, but visibility can collapse in cloud and wind that sweep the Puyehue massif without warning. CONAF, Chile's national parks authority, manages the Anticura sector where the section begins, and rangers require all backcountry hikers to sign in before departure.

Expert recommendation: For most hikers tackling GPT Section 20 as a standalone 2-day trip, walk north to south — CONAF Anticura to Lago Rupanco. The staffed ranger station at Anticura gives a clear, oriented trailhead with the critical option to check current conditions before entering the bamboo. Arrange your Lago Rupanco exit transport before you start: there is no public transport at Las Gaviotas and hitchhiking from the southern end is unreliable. Variant D — starting at the Antillanca ski resort on Volcán Casablanca — is worth considering only if you want the summit experience and are comfortable with exposed overnight camping at the crater base.

Route Overview & Stages

The route progresses through three distinct terrain zones: managed parkland and secondary forest near Anticura, a dense bamboo corridor through the mid-elevation band, and open volcanic plateau above approximately 1,100 m. The bamboo forest is the defining feature of the lower half — expect slow progress and physically demanding passage through overgrown sections. Above treeline, navigation shifts to reading the landscape and following sparse cairns across volcanic scree and old gravel roadbed that once served the Antillanca ski resort.

Stage distances are approximate, derived from hiker-contributed GPT route data. Precise total-distance and elevation figures are not published by the official source. Always download the current GPT tracks from Wikiexplora before departing.

Highlights & Points of Interest

• CONAF Anticura Ranger Station — The northern trailhead on Ruta 215-CH heading toward the Argentine border. Staffed during summer, the station is where backcountry registrations are completed, current trail conditions are confirmed, and the CONAF park entry fee is paid. Skipping this step is not permitted.
• Bamboo Forest Corridor (Quila Zone) — A physically demanding passage through dense colihue bamboo (Chusquea quila). The first 12 km from Anticura follow an easy, obvious track; the final 4 km before treeline are overgrown with trail width reducing to near zero. Tall gaiters and long sleeves are essential kit for this section.
• Treeline Camp (~1,100 m) — Where the bamboo gives way to open volcanic terrain, a handful of flat camping spots appear near the old gravel roadbed. This is the standard overnight stop on a 2-day itinerary and the best-sheltered bivy site between Anticura and the volcanic summit plateau.
• Volcán Casablanca Crater Zone — An active stratovolcano within the Puyehue-Cordón Caulle complex. The crater area is the dramatic centrepiece of Variant D: hikers camp at the crater base before summiting at dawn — one of the most atmospheric bivouac sites on the entire GPT.
• Volcán Antillanca — The section's namesake peak, rising within the Centro de Ski Antillanca concession area. Summit views on clear days span Lago Puyehue, Lago Rupanco, and neighboring volcanoes. Route-finding on the approach relies on stone cairns and bamboo poles spaced widely across volcanic scree.
• Pampa Frutillar — An optional 7.4 km detour that crosses open meadows carpeted with wild strawberry plants and passes two small volcanic lagoons. Strawberries ripen in January and February, making this one of the most unexpected foraging opportunities on any Chilean GPT section.
• Las Gaviotas — The descent terminus at the southern end of Stage 2. The last 4 km before Las Gaviotas are the most technically demanding of the entire section — overgrown trail, minimal markers, and variable underfoot conditions. Reaching Las Gaviotas means the first road access since Anticura.
• Lago Rupanco — The section's southern endpoint and one of the deepest lakes in Chile at over 200 m depth. The northern shore near Las Gaviotas sits within a sparsely populated zone; the nearest resupply point is Entre Lagos, approximately 25 km by road.

Best Time to Hike the Greater Patagonian Trail Section 20: Volcán Antillanca

The Los Lagos Region receives some of the highest annual precipitation in the Americas. The Puyehue-Antillanca massif records over 4,000 mm of rainfall annually at some elevations — there is no dry season here in the European sense, only a less-wet summer window. Plan every day with rain gear ready regardless of the forecast.

November to March is the viable hiking window. Outside these months the volcanic plateau is under heavy snowpack, the bamboo corridor becomes impassable, and the CONAF Anticura sector operates in reduced capacity. January is the single best month to hike this section in 2026: snowpack on the upper volcanic terrain has cleared to expose the cairn route, daylight runs to 15 hours at this latitude, the Pampa Frutillar wild strawberries are ripe, and the Antillanca ski resort (closed outside the June–September winter season) generates no competing traffic on the mountain. Book your Osorno accommodation and exit transfer well in advance — the Lago Puyehue corridor is busy with Chilean summer visitors throughout January.

February is a sound second choice, but later-season snowmelt can expose more unstable scree on the upper plateau. Avoid April onward entirely: snowfall makes the volcanic plateau dangerous without mountaineering equipment and bamboo-forest flooding eliminates the trail. As of 2026, CONAF has not imposed quota restrictions on independent summer hiking in the Anticura backcountry, but always check the SERNAGEOMIN volcanic alert level for the Puyehue-Cordón Caulle system before departure — elevated activity can trigger sudden park closures independent of season.

Practical Information

Accommodation

GPT Section 20 is exclusively wild camping beyond the Anticura trailhead. No staffed refugios or huts exist on the route — plan for complete self-sufficiency for at least 2 nights.

• CONAF Anticura Campsite — Basic but functional, immediately adjacent to the ranger station with toilets and running water. Fee approximately CLP 7,000–10,000 per person per night (around EUR 7–10 as of 2026). The natural pre-hike overnight stop.
• Treeline Forest Camp (~1,100 m) — Wild camping only, no facilities, no fee. Flat ground is limited; pitch before the terrain opens fully onto the plateau. Sheltered from the worst plateau winds by residual vegetation.
• Casablanca Crater Camp (Variant D only) — Exposed wild camping at the base of Volcán Casablanca's crater. High wind is standard; a storm-rated tent with secure guy-wires is non-negotiable. Suitable only for experienced mountaineers.
• Entre Lagos (off-route) — The nearest village to the Las Gaviotas exit, approximately 25 km by road. Guesthouses and cabañas from around EUR 25–40 per person per night. Pre-booking in January is strongly advisable.

Getting There & Back

Northern trailhead (CONAF Anticura): From Osorno — the nearest major city, roughly 100 km west on Ruta 215-CH — summer buses run to Anticura (Buses Turismo Lago Puyehue; journey time approximately 2 hours). From further afield, fly into Puerto Montt El Tepual Airport (PMC), which has direct connections from Santiago and sits approximately 90 km south of Osorno; a bus or hire car between the two takes around 1 hour.

Southern endpoint (Las Gaviotas / Lago Rupanco): No scheduled public transport serves Las Gaviotas. Book a return transfer from Entre Lagos before your hike begins — several operators based in Osorno run trailhead shuttles for GPT hikers. Traffic on the Lago Rupanco north shore is sparse; do not rely on hitchhiking.

Permits & Fees

Parque Nacional Puyehue charges a standard CONAF entry fee at the Anticura gate: approximately CLP 6,000–9,000 for adult non-Chilean nationals (around EUR 6–9 as of 2026). No advance booking or special backcountry permit is required for the standard route. Mandatory registration at the Anticura ranger station is required before entering the backcountry — rangers log your intended route, campsite, and expected return date and conduct welfare checks on overdue hikers. No permit is needed at the Lago Rupanco end, which lies outside the national park boundary.

Gear & Packing List

GPT Section 20 demands a pack that is weatherproof, complete, and light enough to manage the bamboo-forest sections without exhausting your legs before the volcanic plateau. You carry no resupply option for 2 full days in one of the wettest mountain corridors in the Americas. For calorie planning on long wilderness days, read How Many Calories Do You Need Hiking a Full Day? before finalising your food carry.

• Backpack (40–65 L): The Osprey Aether 65 is a reliable full-capacity choice for hikers carrying complete camping gear and 2+ days of food in wet conditions. Ultralight hikers may prefer the Hyperlite Mountain Gear 2400 Windrider, whose cuben-fiber shell provides inherent waterproofing without a rain cover. For a mid-range option with excellent back ventilation on load-heavy bamboo terrain, the Deuter Aircontact Core 50+10 performs consistently in these conditions. For a 2026 overview of the lightest capable packs available, see Best Ultralight Backpacks 2026: 7 Sub-1 kg Packs Tested.
• Waterproof jacket and trousers: Rated to at least 20,000 mm hydrostatic head. The Puyehue region can deliver sustained rain on any day of the year — treat outerwear as essential, not contingency.
• GPS navigation: A dedicated GPS device loaded with official GPT tracks from Wikiexplora before departure, plus a 1:50,000 topographic map and compass. Smartphone battery drains rapidly in cold, wet conditions; carry a power bank and do not navigate solely from a phone.
• Tall gaiters: Essential for the bamboo-forest corridor. They protect legs from colihue canes, keep feet dry when the trail floods, and reduce the pace penalty through overgrown sections.
• Trekking poles: Useful for pushing bamboo canes aside in the forest and for stability on volcanic scree and loose ground on the plateau.
• Water treatment: Filter or purification tablets. Water is absent above treeline between the forest camp and the descent toward Las Gaviotas — carry at least 2 litres from the last confirmed stream crossing before ascending onto the volcanic plateau.
• 3-season tent: Wind exposure on the volcanic plateau is severe. A low-profile, freestanding tent with good guy-line anchoring outperforms a tarp or bivy system in Puyehue conditions.
• Warm mid-layer: Plateau temperatures drop rapidly after sunset even in January. A synthetic insulated jacket plus a fleece is the minimum; down is lighter but loses insulation value when saturated.

Similar Trails You Might Like

GPT Section 20 sits within a corridor of volcanically themed sections that reward hikers who want more of the same landscape. Greater Patagonian Trail Section 8: Volcán Chillán traverses the highly active Nevados de Chillán complex further north, with natural hot springs and a markedly different high-altitude character. Greater Patagonian Trail Section 9: Volcán Antuco circles the near-perfect symmetrical cone of Antuco beside Laguna del Laja — one of the most visually striking sections of the entire route and typically less overgrown than Section 20. For a drier, higher-elevation volcanic experience in the central Andes, Greater Patagonian Trail Section 6: Volcán Descabezado covers the remote Maule region with a very different climate profile. Hikers who enjoy multi-day routes with similarly demanding logistics but a European backdrop will find the Theth to Valbona trail in Albania a compact and striking comparison.

Frequently Asked Questions

What is the best time of year to hike GPT Section 20: Volcán Antillanca?
January is the optimal month as of 2026. Snowpack on the volcanic plateau has cleared to expose the cairn route, daylight hours reach around 15 hours at this latitude, and the wild strawberries on the Pampa Frutillar detour are ripe. November and December are viable but carry more residual snowpack above 1,100 m. Avoid April through October entirely — the plateau becomes impassable under snow and the bamboo corridor floods.

How difficult is GPT Section 20?
The section is rated moderate to challenging. Gradient is manageable across both stages, but the primary difficulty is navigation: the bamboo-forest corridor becomes heavily overgrown with trail width reducing to near zero in the final kilometres before treeline, and the volcanic plateau above relies on widely spaced cairns that vanish in cloud or fresh snow. GPS tracks, prior multi-day wilderness experience, and comfort with self-supported navigation are all essential prerequisites.

How far should I expect to walk each day on this section?
Expect approximately 14–16 km per stage, but real daily progress depends heavily on bamboo density and weather. The overgrown sections in the lower zone can slow pace to 1–2 km per hour. Build extra time into Stage 1, which contains the longest bamboo passage. Carrying the lightest functional pack you can manage is one of the most effective ways to maintain momentum through the forest.

Where can I sleep on GPT Section 20?
Beyond the CONAF Anticura campsite at the trailhead (CLP 7,000–10,000 per night; basic facilities), the section is exclusively wild camping. The standard backcountry overnight is at the forest camp around 1,100 m where bamboo transitions to open volcanic terrain — flat ground is limited but available. The Variant D route uses the Casablanca crater base as an exposed overnight. All backcountry camping is free but requires prior registration at the Anticura ranger station.

Do I need a permit to hike GPT Section 20?
No special backcountry permit is required as of 2026. A standard Parque Nacional Puyehue entry fee (approximately EUR 6–9 for adult non-Chilean nationals) is paid at the Anticura gate. Mandatory route registration at the Anticura ranger station is required before entering the trail — rangers log your route and expected return date. No permit is needed at the southern end near Lago Rupanco, which lies outside the national park boundary.