Last updated September 22, 2026
GR20 Corsica: 16 Stages, Refuges & Complete Trek Guide
The GR20—Fra li Monti—crosses Corsica’s mountainous spine from Calenzana to Conca through granite ridges, boulder fields, steep passes, pine forests, alpine lakes and high plateaus. FFRandonnée gives the classic journey as about 180 kilometres in 16 stages, while current regional planning figures vary with route measurements and variants. What does not vary is the character: this is a rugged mountain trek for experienced hikers, not a relaxed hut-to-hut walk.
Is the GR20 Really Europe’s Hardest Trek?
The GR20 is routinely described as one of Europe’s hardest waymarked long-distance mountain trails. The Parc naturel régional de Corse and FFRandonnée both emphasize its exceptional difficulty. The challenge is not extreme altitude: it is sustained rugged terrain. Expect steep granite, scree, exposed ridges, sections where hands are useful or necessary, long descents, substantial daily ascent and rapid mountain weather. The classic route runs from Calenzana to Conca in 16 stages, with Vizzavona roughly separating the harder northern half from the generally less technical southern half.
PNRC refuges are staffed from May 16 through October 4, 2026. Overnight reservations are mandatory for dormitory bunks, PNRC rental tents and bivouac spaces—even when carrying your own tent.
GR20 Corsica Route Map.
The GR20 follows Corsica’s mountainous interior rather than its coast. The northern half climbs through the Cintu and Rotondu massifs before dropping to Vizzavona; the southern route continues through Renosu, Cuscionu and Bavella before descending to Conca.
How Difficult Is the GR20?
A strong road runner or smooth-trail thru-hiker can still struggle on the GR20 because speed on good trail does not automatically transfer to steep granite, scree, exposed slabs and repeated hand-assisted movement.
Very Rugged
Northern stages repeatedly cross slabs, boulders, scree and steep passes where progress is far slower than distance alone suggests.
Real Mountain Terrain
Some sections are narrow, steep and exposed. Fixed chains or handrails appear on selected passages.
4–8+ Hours
Official stage times commonly fall between four and eight hours before stops, weather delays or navigation problems.
Weight Matters
A heavy backpack magnifies the consequences of every awkward step, steep descent and hand-assisted move.
Fast Changes
Thunderstorms, strong wind, cold and early-season snow can rapidly change the seriousness of exposed terrain.
Moderate
The route stays well below Himalayan altitude. Fitness and technical trail movement matter more than acclimatization.
Do not judge the GR20 from the mileage.
Approximately 180 kilometres spread across 16 stages sounds modest compared with the PCT or GR10. The difference is speed: a short Corsican mountain stage can contain more technical movement and vertical change than a much longer day on smooth long-distance trail.
The North Earned the Trail’s Reputation.
The terrain around Ascu, Monte Cinto, Paglia Orba and the Rotondu massif is why GR20 difficulty cannot be summarized by distance. Granite replaces ordinary footpath, stages become slower and the consequences of poor weather increase.
Photo: Wikimedia CommonsGR20 North vs South.
If you cannot commit to the full crossing, Vizzavona’s rail connection makes half-route trips practical. The two halves feel distinctly different.
| Factor | GR20 North | GR20 South |
|---|---|---|
| Main endpoints | Calenzana → Vizzavona | Vizzavona → Conca |
| Classic stages | Stages 1–9 | Stages 10–16 |
| Terrain | More mineral, broken, steep and technical | More forest, high plateaus and generally smoother movement |
| Key landmarks | Ascu, Pointe des Éboulis, Paglia Orba, Lac de Nino, Capitellu | Renosu country, Prati, Cuscionu, Monte Incudine, Bavella |
| Exposure | More frequent | Still significant, especially around ridges and Bavella variants |
| Best for | Experienced mountain trekkers wanting the classic challenge | Strong hikers wanting a demanding but somewhat less technical GR20 section |
The 16 GR20 Stages.
The classic stage structure matters because refuge reservations are tied to specific dates and overnight locations. Doubling stages can break the reservation chain rather than simply making the trip faster.
| Stage | Route | Official north→south time | Character |
|---|---|---|---|
| 1 | Calenzana → Ortu di u Piobbu | 6h30 | Immediate physical introduction; little margin for a casual late start. |
| 2 | Ortu di u Piobbu → Carrozzu | 7h | Broken granite, scree and a long waterless section. |
| 3 | Carrozzu → Ascu Stagnu | 6h10 | Spasimata footbridge, Muvrella terrain and another stage with major water planning. |
| 4 | Ascu Stagnu → Tighjettu | 8h | Official modern Cintu route via Pointe des Éboulis; one of the hardest stages. |
| 5 | Tighjettu → Ciottulu di i Mori | 4h | Shorter stage beneath Paglia Orba and Capu Tafunatu. |
| 6 | Ciottulu di i Mori → Manganu | 8h | Longer but more flowing stage through Vergio and Lac de Nino country. |
| 7 | Manganu → Petra Piana | 6h30 | Technical, mineral terrain around Bocca alle Porte and the Capitellu high country. |
| 8 | Petra Piana → L’Onda | 4h50 | Standard valley line or more exposed ridge variant in suitable weather. |
| 9 | L’Onda → Vizzavona | 6h05 | Bocca Muratellu, major descent and the end of the northern half. |
| 10 | Vizzavona → E Capanelle | 5h15 | Forest-dominated southern opening with fewer technical difficulties. |
| 11 | E Capanelle → Prati | 6h10 | Forest, Col de Verde and return to exposed high country. |
| 12 | Prati → Usciolu | 5h45 | Exposed ridge walking and potential summer water shortages. |
| 13 | Usciolu → Cuscionu | 4h25 | Arête des Statues followed by the broad pastoral Cuscionu plateau. |
| 14 | Cuscionu → Asinao | 4h15 | Shorter stage with optional Monte Incudine extension. |
| 15 | Asinao → Paliri | 7h | Bavella; standard GR or harder alpine variant through the granite towers. |
| 16 | Paliri → Conca | 5h | Long descent from the mountains toward warm Mediterranean maquis. |
Times are the current PNRC north-to-south reference times and are not guarantees. Pack weight, heat, snow, rain, wind and individual movement on rock can materially change a stage.
Not Every GR20 Mile Is Bare Granite.
Lac de Nino sits among distinctive wet grasslands called pozzines. The landscape creates one of the route’s sharpest contrasts after the harder northern mountains—but it is also protected. PNRC prohibits swimming in high-altitude lakes and asks hikers not to walk on the sensitive pozzines.
Photo: Arnaud Abadie · Wikimedia Commons · CC BY-SA 4.0GR20 Refuges and Reservations.
The Parc naturel régional de Corse manages 12 principal GR20 refuges. Several other stages use private accommodation around places such as Vizzavona, Capannelle and the Cuscionu plateau.
May 16 → October 4
These are the current dates PNRC refuges are staffed for the 2026 season.
Reserve It
Sleeping inside a staffed PNRC refuge requires an advance booking for the correct date and location.
Still Reserve
Carrying your own shelter does not remove the reservation requirement. Book one bivouac place per person.
PNRC Option
Two-person park tents include a thin mattress. Hikers still need to carry their own sleeping bag.
Order on Arrival
PNRC currently says dinner, breakfast and packed lunch are ordered at the refuge rather than reserved through the overnight booking platform.
Do Not Arrive Too Late
The park recommends arriving by 18:00 to order dinner. Reserved accommodation is guaranteed only until 19:00.
How Much Do GR20 Refuges Cost?
Accommodation style changes both budget and pack weight. Private structures along the route set their own prices, so the figures below apply specifically to PNRC refuge services.
Per person per night in the shared refuge sleeping area where available.
Per person. Carry your own tent but reserve the designated bivouac space.
One bivouac place plus PNRC tent for one person and thin mattress.
Two bivouac places plus one two-person PNRC tent and mattresses.
Food can cost more than the bed.
PNRC currently lists approximate prices of €10 for breakfast, €10 for a packed lunch and €20 for dinner, and suggests budgeting around €50 per day if buying all meals. Carry cash because mountain payment systems should not be treated like city retail infrastructure.
Think Mountain Shelter, Not Alpine Hotel.
PNRC describes the refuges as intentionally simple: shared sleeping areas, bivouac space, water, toilets, basic showers, cooking facilities, small shops and seasonal food service. The point is to support a mountain crossing—not remove the mountain from it.
Photo: MartinThoma · Wikimedia CommonsCan You Wild Camp on the GR20?
No. PNRC explicitly prohibits wild bivouacking along the GR20. Overnight camping is allowed only near refuges or within designated areas.
Prohibited
You cannot simply choose a lake, ridge or forest clearing and pitch a tent for the night.
Allowed With Booking
Designated spaces around participating refuges are the normal legal own-tent option.
Strict Restrictions
From June 15 through September 30, smoking and lighting fires are prohibited in forests, scrublands and mountain massifs.
No Swimming
PNRC currently prohibits bathing in high-altitude lakes.
Stay Off Them
The wet alpine grasslands are fragile. The park specifically asks hikers not to trample them.
No Trekking Poles
PNRC currently prohibits pole use in these sensitive wetland areas.
The GR20 No Longer Goes Through the Cirque de la Solitude.
On June 10, 2015, a violent weather event and rockslide in the Cirque de la Solitude killed seven hikers. The former GR20 passage was subsequently de-marked and de-equipped.
The official GR20 now follows a different high route between Ascu Stagnu and Tighjettu through the Monte Cinto massif, climbing toward Pointe des Éboulis and traversing toward Bocca Crucetta.
The replacement is not an easy bypass. PNRC describes roughly 1,200 metres of climbing on the stage, extensive scree and slabs, plus several protected passages.
- Do not navigate toward the old Cirque line from an outdated guide.
- Use the current red-and-white GR markings.
- Early-season snow can substantially increase difficulty.
- Bad weather is a legitimate reason not to start the stage.
The modern GR20 crosses the high Cintu massif rather than the former Cirque de la Solitude line.GR20 Water and Food Planning.
The refuge system makes the trail easier to provision than a self-supported wilderness expedition, but specific official stages have serious water warnings.
Fill at Ortiventi
PNRC identifies this as the final water source before Ortu di u Piobbu on the opening stage.
Long Dry Section
The park warns that water is unavailable between the upper source near Ortu and Carrozzu.
No Reliable Water
PNRC again warns that the route to Ascu is waterless and specifically says not to drink from Lac de la Muvrella.
Summer Shortage
The Prati–Usciolu stage carries an official July/August water-shortage warning.
Food Available
Staffed park refuges typically provide a small shop plus optional dinner, breakfast and packed lunch.
Carry One Meal
Do not make the entire food plan dependent on arriving before dinner service or on every refuge having every item you expected.
Filter or treat water.
The park’s own mandatory-pack guidance includes a filtering bottle and water-purification tablets. Livestock, wildlife and variable source conditions are enough reason not to equate clear mountain water with treated drinking water.
The South Is Easier Than the North—not Easy.
Bavella is the reminder. The ordinary GR continues through demanding mountain country, while the alpine variant threads more directly among granite towers and includes steeper rocky movement and protected slabs.
Photo: Wikimedia CommonsBest Time to Hike the GR20.
The current staffed-refuge season runs from mid-May into early October, but snow, heat, thunderstorms, fire restrictions and water availability make the middle of that window very different from its edges.
| Period | Mountain conditions | Refuges | Main advantage | Main concern |
|---|---|---|---|---|
| Mid–late May | High-country snow possible | Staffed from May 16 in 2026 | Cool temperatures | Winter equipment and skills may still be necessary |
| June | Improving rapidly | Open | Long daylight and better water | Lingering névé on northern high stages |
| July | Core summer | Open / busy | Most reliable snow-free travel | Heat, thunderstorms, demand and dry sources |
| August | Core summer | Open / busy | Snow usually minimal | Heat, fire risk and water scarcity |
| September | Cooler | Open | Strong balance of conditions and lower heat | Shorter days and increasing storm risk late month |
| Early October | Autumn mountain conditions | Staffed through Oct. 4 in 2026 | Quieter trail | Cold, short days and early snow |
| Late autumn–spring | Potential winter mountaineering | Ungarded / limited services | Different expedition | Snow, avalanche, navigation and no normal summer support |
PNRC says some mountain massifs can be closed at any time during severe fire danger. The official fire-risk map is updated at 18:00 for the following day. From mid-June to mid-September, treat this as part of the evening planning routine.
Should You Hike GR20 Northbound or Southbound?
The trail works in either direction, but the experience changes because the hardest terrain is concentrated in the north.
Calenzana → Conca
The classic published direction. You tackle the technical north while fresh, then transition toward somewhat smoother southern stages.
Conca → Calenzana
Begin with hotter, lower southern terrain and save the hardest granite stages for the end after building trail fitness.
Reservations + Travel
Once a legal overnight chain is assembled, transport and accommodation availability may matter more than tradition.
PNRC currently states that no GR20 departure from Calenzana is permitted after 11:00. Build arrival logistics so Stage 1 never depends on an afternoon arrival.
The Mountains Do Not End Until Almost the End.
From Paliri the trail gradually leaves the high granite world and descends through pine forest and maquis toward Conca. The Mediterranean climate becomes obvious just as the 16-stage crossing finally releases you from the mountain spine.
Photo: Rémih · Wikimedia CommonsCalenzana, Vizzavona and Conca Logistics.
The trail begins and ends in very different transport environments. Vizzavona in the middle is the critical escape and half-GR20 junction.
Calenzana
Calvi is the natural regional gateway. Arrange the final road connection to Calenzana and arrive early enough to respect the 11:00 departure cutoff.
Vizzavona
The railway makes Vizzavona exceptionally useful for starting or finishing a half-GR20 and for abandoning a complete crossing if necessary.
Conca
PNRC lists an on-request shuttle from Conca toward Sainte-Lucie-de-Porto-Vecchio and Porto-Vecchio.
Open Jaw Can Help
For an international or mainland-France trip, compare arriving near the northern start and departing from southern Corsica rather than automatically returning to the first airport.
Use Vizzavona
The train connection makes northern-only or southern-only crossings much easier to build than cutting the route at an arbitrary refuge.
Keep Flexibility
Do not make a same-day airline connection depend on finishing Stage 16 at the predicted time.
GR20 Gear Priorities.
The PNRC publishes a specific baseline equipment list. The important principle is that the GR20 needs mountain equipment even though it is a marked hiking trail.
Mountain-Ready
Use footwear already proven on rough rock with a loaded pack. The northern terrain punishes poor fit and weak edging.
Waterproof Shell
PNRC specifically includes a waterproof jacket in its mandatory pack guidance.
Insulating Layer
High Corsican evenings can be cold even when coastal temperatures are hot.
Sleeping Bag
Required even when using a PNRC rental tent. Refuge blankets should not be assumed.
Filter + Treatment
The park explicitly lists a filtering bottle plus purification tablets in the core kit.
Headlamp + First Aid
Both appear in PNRC’s required-pack guidance and matter when a technical stage takes longer than expected.
Early-season gear may be a different category.
PNRC warns that snowfields can persist on high northern stages and specifically mentions crampons, rope and ice axe as potentially necessary around the Manganu–Petra Piana high country early in the season. If those tools are required, the trip has moved beyond ordinary summer trekking.
Where the GR20 Fits in Europe.
The GR20 owns the rugged Mediterranean mountain-trek position in the European trail cluster. These parent and sibling pages let readers compare it with very different European trekking systems.
GR20 or Tour du Mont Blanc?
Both are famous European mountain journeys of similar overall length. That is almost where the similarity ends.
| Factor | GR20 | Tour du Mont Blanc |
|---|---|---|
| Approx. distance | ≈180 km | ≈170 km |
| Typical duration | ≈15–16 days | ≈7–11 days |
| Terrain | Very rugged granite, scree, scrambling-style movement | Primarily established Alpine hiking trail |
| Accommodation | Basic refuges, designated bivouacs, some private lodging | Refuges, hotels and villages |
| Food access | Good but more basic and remote | Frequent villages and developed refuge system |
| Technical feel | Higher | Lower on the standard route |
| Best first major European trek? | Better after prior rugged mountain experience | More forgiving infrastructure for a first major hut trek |
Three Skills That Matter More on the GR20.
These three guides support the weather, navigation and physical demands that repeatedly decide whether a difficult GR20 stage remains manageable.
Check These Sources Before Starting the GR20.
Reservations, fire closures, snow and refuge operations can change. The official Corsican park should control the final trip rather than an old itinerary or downloaded blog post.
GR20 Corsica FAQ.
The high-intent questions travelers need answered before booking a Corsica crossing.
How long is the GR20?
The classic GR20 is commonly described at approximately 180 kilometres / 112 miles from Calenzana to Conca. Exact measurements vary with mapping method, current alignment and variants.
How many days does the GR20 take?
The Parc naturel régional de Corse divides the classic route into 16 official stages. Strong experienced hikers sometimes combine stages, but PNRC specifically discourages unnecessary doubling because of route difficulty and the fixed reservation system.
Is the GR20 the hardest trek in Europe?
The GR20 is widely described as one of Europe’s hardest marked long-distance hiking routes, and official Corsican and French hiking organizations emphasize its exceptional difficulty. There is no universal objective ranking of every European trek, but GR20’s rugged granite, exposure, scrambling-style terrain and sustained daily climbing justify its reputation.
Do you need a permit to hike the GR20?
There is no single thru-hike permit comparable with a U.S. wilderness lottery, but overnight accommodation is regulated. During the staffed season, PNRC requires reservations for refuge bunks, rented tents and own-tent bivouac spaces.
Can you wild camp on the GR20?
No. PNRC prohibits wild bivouacking. Camping is allowed only near refuges and in designated authorized areas.
How much does a GR20 refuge cost in 2026?
Current PNRC rates are €20 per person for a refuge bunk, €12 per person for an own-tent bivouac place, €27 for one person with a PNRC rental tent and €39 for two people sharing a rental tent.
Do you have to reserve if you carry your own tent?
Yes. PNRC states that each person using an own-tent bivouac must reserve a bivouac place for the correct refuge and date.
When are GR20 refuges staffed in 2026?
The PNRC refuges are staffed from May 16 through October 4, 2026.
What is the hardest part of the GR20?
The northern half between Calenzana and Vizzavona contains most of the route’s hardest sustained terrain. The Ascu Stagnu–Tighjettu stage through the Monte Cinto massif is especially demanding, with roughly 1,200 metres of climbing and extensive scree and slab terrain.
Does the GR20 still go through the Cirque de la Solitude?
No. After the fatal 2015 accident, the former route through the Cirque de la Solitude was removed from the GR20. The official trail now crosses higher through the Monte Cinto massif via the Pointe des Éboulis and Bocca Crucetta area.
What is the difference between GR20 North and GR20 South?
The northern route from Calenzana to Vizzavona is generally more technical, rocky and demanding. The southern half from Vizzavona to Conca contains more forest and pastoral terrain, although it remains strenuous and still includes exposed ridges and the Bavella mountains.
Can you hike only half of the GR20?
Yes. Vizzavona roughly divides the trail into northern and southern halves and has rail connections, making it the natural place to begin or end a half-GR20 itinerary.
What is the best time to hike the GR20?
June through September is the main summer trekking window. June can retain snow on high northern terrain, July and August are warmer and busier with greater fire and water concerns, and September is cooler with shorter daylight and increasing late-season weather risk.
Can you buy food on the GR20?
Yes. Staffed PNRC refuges generally provide a small shop and offer dinner, breakfast and packed lunches. Private accommodation also provides food in several sectors. Availability is basic and should not be treated like a supermarket supply chain.
Do you need technical climbing gear for the GR20?
Not normally during established snow-free summer conditions. The trail does include steep rocky terrain and protected sections. Early-season snow can change the requirements significantly; PNRC specifically warns that crampons, ice axe and rope may be needed on some high northern stages when snow remains.
Which direction should you hike the GR20?
Calenzana to Conca is the traditional north-to-south direction and places the hardest terrain first. Hiking Conca to Calenzana saves the harder northern terrain for the end. Both directions are used; accommodation availability and transport may decide the better option.
Can you start the GR20 from Calenzana in the afternoon?
Current PNRC rules state that no departure onto the GR20 from Calenzana is authorized after 11:00. Plan to be in Calenzana early before beginning Stage 1.
Respect the Terrain More Than the Mileage.
The GR20 is only around 180 kilometres long, but sixteen Corsican mountain stages are not equivalent to sixteen ordinary hiking days. Build the refuge chain first, carry a light but mountain-capable pack, protect enough water for the known dry stages, start exposed days early and treat weather or fire closures as reasons to change the plan—not obstacles to push through.
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Global Summit Guide is an independent mountaineering resource founded in 2026. The team combines first-hand trekking and climbing experience with in-depth research and professional health and nutrition review to help climbers choose objectives, prepare properly, and stay safe.
Health, altitude, and nutrition content is reviewed by Taylor Ludlow (Registered Nurse) and Brigg Hoopes (Nutritionist).
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