The 15-Day GR20 Corsica Itinerary: The Health-Smart Version
A 15-day GR20 traverse runs Calenzana to Conca across 16 official refuge-to-refuge stages, most hikers combine two of the shorter southern stages to finish in 15 days instead of 16. CDC classifies France as a low-risk country for travelers' diarrhea, the same category as the rest of northern and western Europe, but that baseline assumes hotel kitchens and municipal water, not two weeks of shared refuge meals and spring water drawn near grazing livestock. The structural fix is carrying azithromycin and dicyclomine before you fly, not sourcing them mid-trail: refuges are staffed only mid-May through early October, and stretches like the Ascu-to-Vizzavona middle third put you a full trail-day from the nearest pharmacy. A PA-C co-founder of Wandr Health recommends packing the GR20 Corsica Trek Pack (azithromycin, Rx-strength ibuprofen for the cumulative descent load, and dicyclomine) before departure rather than hoping a village pharmacy has stock mid-traverse.
Corsica's GR20 is not a scenic walk with a health footnote. It's roughly 180 km and 12,000 m of cumulative elevation gain across the island's granite spine, and for a week and a half in the middle of it, the nearest pharmacy is a full trail-day away. CDC rates France as a low-risk country for travelers' diarrhea, the same tier as the rest of northern and western Europe, but that rating assumes hotel breakfasts and municipal tap water, not two weeks of communal refuge kitchens and spring water shared with grazing livestock. This 15-day itinerary links the trail's 16 official stages the way most fit hikers actually do it, combining two of the shorter southern legs, and builds the health prep around what the terrain and the refuge system genuinely expose you to, not a generic Europe checklist.
Who this itinerary is for
This route suits hikers with real multi-day trekking experience, ideally at least one prior hut-to-hut or backcountry trip with a loaded pack, and several months of hill training beforehand. The GR20 is consistently ranked among Europe's most technically demanding long trails: the northern half includes chain-assisted rock scrambles and a full day skirting Monte Cinto, Corsica's highest peak, with real fall consequences for anyone under-fueled or dehydrated.
Returning long-distance hikers will recognize the rhythm, refuge to refuge, self-carried food between resupply points, and can focus prep on the parts that are genuinely different here: shared-kitchen food exposure and spring water that isn't always treated. First-timers to hut-based trekking should budget extra training time for the descents specifically. Several stages drop 800 to 1,100 m in a single day, and cumulative joint load, not altitude, is this trail's quiet structural risk.
This is not a family or first-hike itinerary. There's no vehicle support, no daily bag transfer, and no cell coverage across long stretches of the route. Anyone with a significant cardiac, respiratory, or orthopedic condition should get medical clearance before committing to consecutive 4 to 10-hour days on technical terrain. Solo hikers are common on the GR20 and the refuge network makes it a reasonably social trail to do alone, but everyone should tell someone their planned itinerary and expected finish date before starting.
The route
The GR20 runs diagonally across Corsica from Calenzana in the northwest to Conca in the southeast, split by hikers and guidebooks alike into a northern half (Calenzana to Vizzavona) and a southern half (Vizzavona to Conca). The north is the more technical section: narrower, rockier trail, chain-assisted passages, and the trip's hardest single stage on day 4 past Monte Cinto. The south trades technicality for distance, longer, more rolling stages across open ridgeline and the Cusciunu plateau, with the Aiguilles de Bavella, a run of red granite spires near the trail's southern end, as the signature payoff.
Vizzavona, roughly the traverse's midpoint, is the only stop with train access, making it the natural resupply and reset point on a 15-day itinerary. The official route is split into 16 refuge-to-refuge stages; this itinerary follows all 16 but combines the two shortest southern stages, Usciolu-to-Matalza and Matalza-to-Asinau, into a single longer day 13, which is how most hikers who aren't doing all 16 nights compress the trip to 15 days without skipping trail.
Day-by-day plan
Day 1: Calenzana to Ortu di u Piobbu. The official start, a steep 10.9 km, roughly 1,376 m climb out of the Balagne vineyards into maquis scrubland and exposed granite. Refuge meals and shared kitchens begin tonight, and food hygiene habits from day one carry through the whole trip.
Day 2: Ortu di u Piobbu to Carrozzu. A shorter but technical 7.3 km stage with chain-assisted sections and a steep drop into the Carrozzu valley. This is where cumulative descent load, the reason a Rx-strength anti-inflammatory is in the kit, starts to register.
Day 3: Carrozzu to Ascu Stagnu. 4.9 km down to the Asco valley, one of the only points on the northern half with road access. It's the last easy vehicle exit before a multi-day stretch without one.
Day 4: Ascu Stagnu to Tighjettu. The trail's hardest stage: a technical climb skirting Monte Cinto before a steep, exposed descent. Long and consequential if you're under-hydrated; refuge taps are the only reliable refill until you reach Tighjettu.
Day 5: Tighjettu to Ciottulu di i Mori. A short 6.4 km recovery day to a small, high refuge with sweeping views. Use the lighter mileage to actually rehydrate and refuel rather than skip meals out of fatigue.
Day 6: Ciottulu di i Mori to Manganu. The GR20's longest stage at roughly 24.8 km, a rolling traverse past the Col de Vergio (a road-access escape point roughly a third of the way through) and Lac de Nino before dropping to Manganu. Start early; past Col de Vergio you're committed to a long day with no quick way out.
Day 7: Manganu to Petra Piana. 8.5 km climbing to the Brèche de Capitellu, past the glacial lakes Melo and Capitellu, then down to Petra Piana. Cold, rocky terrain can mask dehydration, drink on a schedule rather than by thirst alone.
Day 8: Petra Piana to Onda. 9.8 km with a steep, knee-testing descent. A second consecutive descent-heavy day is the point where scheduled, rather than as-needed, anti-inflammatory dosing tends to make sense if joint pain isn't resolving overnight.
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Day 9: Onda to Vizzavona. 10.2 km down to the trail's unofficial midpoint and its only train station. Resupply, check gear, and honestly assess any TD or joint symptoms before committing to the southern half.
Day 10: Vizzavona to E Capannelle. 13.8 km into the southern GR20, which trades technical rock for longer, rolling stages. Southern refuges see a different mix of hikers starting fresh versus finishing the north, food handling can vary refuge to refuge, favor hot, freshly cooked options where there's a choice.
Day 11: E Capannelle to Prati. The longest southern stage at 17.6 km, with an optional Monte Renoso summit detour. Full-sun exposure on less technical terrain still raises dehydration and heat-strain risk, refill at every marked source.
Day 12: Prati to Usciolu. 10.9 km crossing two passes near 2,000 m to a refuge commonly cited as one of the trail's better-run kitchens. Still worth treating as a shared-kitchen exposure and keeping hand hygiene consistent regardless of a refuge's reputation.
Day 13: Usciolu to Asinau via Matalza. The longest southern day at roughly 20.8 km, linking two shorter official stages across the open Cusciunu plateau. This is the standard way to compress the GR20's 16 stages into 15 days. If cumulative food and water exposure has produced any cramping, this is a reasonable point to start dicyclomine on a scheduled basis rather than waiting for it to worsen.
Day 14: Asinau to I Paliri. 15.2 km over the Col de Bavella, with the Aiguilles de Bavella's red granite spires as the trail's signature view. Dramatic, but still a full trail-day from vehicle access at the col, keep treating GI symptoms rather than pushing through on the assumption help is close.
Day 15: I Paliri to Conca. The final 13.1 km, a long, rocky descent through Mediterranean maquis to the trail's southern terminus. Knees and ankles are at their most fatigued on this last big descent, exactly the cumulative load the ibuprofen was packed for from day one, not just the trail's hardest early stages.
Health prep for this trip
The structural health story on the GR20 isn't a single hazard, it's remoteness stacked on shared exposure. CDC's baseline travelers' diarrhea risk rating for France is low, grouped with the rest of northern and western Europe, but that rating describes typical hotel-and-restaurant travel. A GR20 traverse means up to two weeks of communal refuge meals and spring water that isn't always filtered, closer to the exposure profile of a backcountry trip than a city break, even though the country is the same.
CDC's Yellow Book lists azithromycin (500 mg once daily for 3 days, or as a single higher dose) as a standard self-treatment option for travelers' diarrhea, particularly for diarrhea with fever or blood. Most GR20 hikers pack it alongside dicyclomine (Bentyl) for the cramping that commonly accompanies TD, and Rx-strength ibuprofen for the cumulative joint and muscle strain of consecutive long descent days. Wandr's GR20 Corsica Trek Pack bundles a licensed provider review for all three prescriptions before you fly, which matters here specifically because refuges are staffed only from roughly mid-May through early October and several stretches of trail sit a full day from the nearest village pharmacy.
Fluid loss adds up on long, hot southern stages even without TD. Oral rehydration, plain water plus a source of electrolytes, is the first-line response to any diarrhea per CDC guidance, and it's worth carrying rehydration salts or tablets specifically because refuge food is salty and starchy rather than balanced, and southern stages like day 11 run long in full sun.
Confirm routine vaccinations (MMR, Tdap, varicella, annual flu) are current before any international trip, per CDC's general travel guidance for France. No malaria prophylaxis or yellow fever vaccination applies to Corsica. If you take regular medications, bring more than a 15-day supply in case of trail delays, and carry a card listing your blood type, allergies, and current medications in case you need refuge or village medical help.
What to pack
Beyond standard hut-trekking gear (layered clothing for temperature swings between valley floor and ridgeline, trekking poles for the steep descents, a lightweight sleeping bag liner for refuge bunks), build a small medical kit: your self-treatment TD course, dicyclomine, Rx-strength ibuprofen, blister care (moleskin or hydrocolloid bandages), a basic first-aid kit, sunscreen and a hat for the exposed southern stages, and a water treatment option (tablets or a light filter) for sources between refuges. A 2 to 4-liter water carrying capacity is standard for the longer stages, particularly day 6 and day 11.
Refuge bunks come with a mattress and blanket but not bedding, so a sleeping bag liner or lightweight sleeping bag is standard, check with each refuge on current requirements since policies vary by hut and by season. Cash in small denominations is worth carrying since card readers are unreliable at remote refuges, and a printed or offline copy of your refuge reservations saves time with wardens who may have limited connectivity to verify bookings on busy summer nights.
Best time to go and what to avoid
The trail is effectively open from mid-May to early October, with late June and early September offering the best balance of stable weather, full refuge services, and manageable crowds. Afternoon thunderstorms are common in peak summer at altitude, an early start each day reduces exposure during storm windows.
Cost expectations
Refuge bunks run roughly €20 a night booked in advance through the official PNRC platform; meals aren't pre-bookable and are typically arranged with the warden on arrival, with dinner and breakfast together running in the range of half-board packages most hikers report as reasonable for a staffed mountain hut. Add transport to Calenzana and from Conca, trekking gear if you don't already own it, and the cost of your pre-trip medical visit and prescriptions. It isn't a budget trip once flights and gear are factored in, but it's also not a guided-expedition price tag, most of the cost is time and physical preparation rather than money.
Talk with your doctor or a Wandr provider about whether azithromycin, dicyclomine, or ibuprofen are appropriate given your health history before this trip. Speak with a provider before starting any new medication.
Day-by-day plan
| Day | What you're doing | Health note |
|---|---|---|
| 1 | Calenzana to Ortu di u Piobbu The GR20's official start, a steep 10.9 km climb out of the Balagne vineyards into the maquis scrubland and granite of the Corsican interior. | Refuge meals and shared kitchens start today. Wash hands before eating and treat this as day one of a food-hygiene routine you'll keep for two weeks. |
| 2 | Ortu di u Piobbu to Carrozzu A short but technical 7.3 km stage with chain-assisted rock sections and a steep drop into the Carrozzu valley. | Ankles and knees take the first real pounding on the descent. This is the load the Rx-strength ibuprofen in your kit is for. |
| 3 | Carrozzu to Ascu Stagnu 4.9 km down to the Asco valley and its old ski station, one of the only points on the northern GR20 with road access. | Last easy vehicle exit before a multi-day stretch with no road access. If TD symptoms are building, this is the practical point to decide whether to treat and continue or step off. |
| 4 | Ascu Stagnu to Tighjettu The hardest stage on the trail, a technical ~1,160 m climb skirting Monte Cinto, Corsica's highest peak, before a steep, exposed descent to Tighjettu. | Long, technical day with real fall consequences if you're dehydrated or under-fueled. Carry more water than you think you need; refuge taps are the only reliable refill until Tighjettu. |
| 5 | Tighjettu to Ciottulu di i Mori A short recovery stage, 6.4 km, to a small refuge with sweeping views back over the peaks you've just crossed. | A light day is the right time to eat and rehydrate properly after two demanding stages, not to skip meals because you're tired. |
| 6 | Ciottulu di i Mori to Manganu The longest stage on the GR20 at roughly 24.8 km, a rolling traverse past the Col de Vergio and Lac de Nino before dropping to the Manganu refuge. | You'll pass Col de Vergio, a road-access escape point, partway through. Past it, you're committed to a long day with no quick way out, start early and pace conservatively. |
| 7 | Manganu to Petra Piana 8.5 km climbing to the Brèche de Capitellu, with the twin glacial lakes Melo and Capitellu below, then down to Petra Piana. | Cold, rocky terrain around the lakes can mask dehydration, keep drinking on schedule rather than by thirst alone. |
| 8 | Petra Piana to Onda 9.8 km with a steep, knee-testing descent off the ridge to the Onda refuge. | Second consecutive descent-heavy day. If knee or ankle pain is building rather than resolving overnight, that's the signal to use the ibuprofen on a scheduled basis, not just as needed. |
| 9 | Onda to Vizzavona 10.2 km down to Vizzavona, the trail's unofficial halfway point and the only spot with a train station. | Vizzavona is your resupply and reset point, restock food, check gear, and honestly assess whether any TD or joint symptoms warrant a short break before the southern half. |
| 10 | Vizzavona to E Capannelle 13.8 km through forest and open ridgeline into the southern half of the GR20, which trades technical rock for longer, more rolling stages. | The southern refuges see less turnover between hikers finishing the northern half and those starting fresh, food handling standards can vary refuge to refuge. Stick to hot, freshly cooked food where you have a choice. |
| 11 | E Capannelle to Prati The longest southern stage, 17.6 km, with an optional detour to summit Monte Renoso. | A long day at altitude in full sun raises dehydration and heat-strain risk even though the terrain is less technical than the north. Refill at every marked source. |
| 12 | Prati to Usciolu 10.9 km crossing two passes near 2,000 m before dropping to the Usciolu refuge. | Usciolu is consistently cited as one of the trail's better-run kitchens, still, treat any refuge meal as a shared-kitchen exposure and keep hand hygiene consistent. |
| 13 | Usciolu to Asinau via Matalza A longer combined day (~20.8 km) linking two shorter official stages across the open Cusciunu plateau to the Matalza sheepfolds, then on to Asinau. This is the standard way hikers compress 16 stages into 15 days. | It's your longest single day south of Vizzavona. Start early, and if cramping from the trip's cumulative food and water exposure has been building, this is a reasonable day to start the dicyclomine on a scheduled basis rather than waiting for it to worsen. |
| 14 | Asinau to I Paliri 15.2 km over the Col de Bavella, with the red granite spires of the Aiguilles de Bavella as the trail's signature view. | A dramatic, photogenic day, but still a full trail-day from vehicle access at the col. Keep treating any GI symptoms rather than pushing through them on the assumption help is close. |
| 15 | I Paliri to Conca The final 13.1 km, a long, rocky descent through Mediterranean maquis to Conca and the trail's southern terminus. | Knees and ankles are at their most fatigued on the last big descent of a 15-day trip, this is exactly the cumulative load the ibuprofen was packed for, not just the first hard days. |
Frequently Asked Questions
Most healthy travelers don't need anything beyond routine vaccinations for a trip to France generally. A multi-day GR20 traverse is different: you're eating shared refuge meals and drinking spring-fed water for up to two weeks with stretches of a full trail-day from the nearest pharmacy. Many GR20 hikers carry a self-treatment course of azithromycin for travelers' diarrhea and an antispasmodic like dicyclomine for cramping, arranged with a provider before departure. Speak with a provider about what's appropriate for your health history.
No. CDC classifies France, along with the rest of northern and western Europe, as a low-risk country for travelers' diarrhea, the same category as Canada or Australia. That baseline reflects typical hotel and restaurant travel. A GR20 traverse changes the exposure: refuge kitchens are shared and communal, and drinking water often comes from unfiltered mountain springs near grazing livestock, which is a different risk profile than a week in Nice or Paris.
PNRC-managed refuges are generally equipped with a tap or marked spring described as potable, and most hikers drink from these without treatment. Between refuges, water sources are seasonal and not guaranteed at every stage; some are near grazing areas and are commonly treated or filtered by cautious hikers. Fill up fully at each refuge and carry 2 to 4 liters for the day ahead.
Late June through early September, when PNRC refuges are fully staffed and the high passes are typically clear of snow. Refuges are generally staffed from mid-May to early October; outside that window, huts may be closed or unstaffed and snow can make the northern high passes hazardous. July and August are the most crowded months, late June or early September offer a similar weather window with fewer hikers.
The GR20 is widely considered one of the most physically demanding long-distance trails in Europe, with roughly 180 km and 12,000 m of cumulative elevation gain across the full traverse. A 15-day pace averages a bit over 12 km a day, but individual stages range from under 5 km to nearly 25 km with technical, chain-assisted sections in the north. Prior multi-day trekking experience and several months of hill training with a loaded pack are standard preparation.
It varies by stage. Asco (day 3), Col de Vergio (day 6), Vizzavona (day 9), and the Col de Bavella (day 14) all have road access where a car could reach you. Between those points, especially the Tighjettu-to-Manganu stretch, you're a full trail-day from a vehicle and further still from a pharmacy, which is the practical reason to carry self-treatment medication rather than plan to find a pharmacy on the trail.
Yes. PNRC refuge bunks require advance booking through the official reservation platform, which typically opens in January for the coming season. Meals generally cannot be pre-booked and are arranged with the refuge warden on arrival, subject to availability.
Beyond standard trekking gear, most hikers pack a self-treatment course of an antibiotic effective against travelers' diarrhea (azithromycin is a common choice), an antispasmodic such as dicyclomine for cramping, Rx-strength ibuprofen for cumulative joint and muscle load, blister and basic wound care, and a water treatment option for sources between refuges. Speak with a provider about what fits your health history before you go.
Mark Karam, PA-C is a board-certified Physician Associate with emergency and urgent care experience and co-founder of Wandr Health.