GR20 Guide
Everything you need to plan Europe's toughest long-distance trail: ~177.5 km across Corsica from Calenzana to Conca. Start with the four questions every GR20 hiker asks.
How many days?
16 classic stages, 10–16 realistic walking days — a table per fitness level, plus rest days and doubling stages.
North or south?
The trail splits at Vizzavona: technical granite north vs greener ridges south — and which direction to walk.
Booking refuges
Booking is mandatory for every night, tents included. How pnr-resa.corsica works and when to reserve.
When to go
Mid-June to mid-September is the classic window. Month-by-month pros and cons, snow and storms.
On the trail
Cirque de la Solitude
The GR20's most infamous passage — the 2015 rockfall, and why the trail now goes higher past the Pointe des Éboulis.
Variants & side-trips
Alpine variants and summit detours: Monte Cinto, Paglia Orba, the Bavella needles and the Melo–Capitello lakes.
Dig deeper
All refuges & huts
Every refuge, bergerie, gîte and hotel on the trail — altitude, resupply, water and booking links.
All 16 stages
Stage-by-stage distances, ascent, descent and walking times per fitness profile.
Build your own GR20 itinerary
The free RandoNav planner splits the trail into daily stages matched to your fitness, with real refuges as overnight stops.
Open the GR20 plannerFrom people who walked it
Used the GR20 app last week when the weather closed in near Bocca di Borgu and visibility dropped to about 5 meters. Unreal tool for this brutal terrain.
Brilliant tool! Would love an easy way to cache specific offline elevation chunks just to feel extra secure when heading deep into the Corsican interior.
Saved to my home screen before starting the GR20 north section. Never left home without it. 5 stars.
Finally, a trail app designed by someone who actually hikes! No sign-up walls, no bloated menus, just pure, fast navigation that loads instantly when you have zero signal.
The minimalist design is a breath of fresh air. On the trail my brain is fried and I just want to see where I am, how far the next refuge is, and the profile ahead. Nailed it.
Runs super smooth on mobile. Doesn't completely fry your phone battery either, which is usually the curse of web-based mapping tools in the mountains.
The elevation tracking relative to where you actually are on the route is so well implemented. No more guessing 'is that final ridge the last one?' — you can see the reality on the screen.
Passed a couple of struggling hikers at the refuge who were wrestling with a messy paper map and a dying generic app. Showed them your site and they bookmarked it instantly.
If you're heading to Corsica or doing the Tour du Mont Blanc, scrap the heavy map apps and just keep a shortcut to these on your home screen. Absolute game-changer.
No fluff, works offline when it matters, and keeps you on the right path. What else could a thru-hiker ask for?
Absolute perfection. Please make one for the Haute Route next!
Used the GR20 app last week when the weather closed in near Bocca di Borgu and visibility dropped to about 5 meters. Unreal tool for this brutal terrain.
Brilliant tool! Would love an easy way to cache specific offline elevation chunks just to feel extra secure when heading deep into the Corsican interior.
Saved to my home screen before starting the GR20 north section. Never left home without it. 5 stars.
Finally, a trail app designed by someone who actually hikes! No sign-up walls, no bloated menus, just pure, fast navigation that loads instantly when you have zero signal.
The minimalist design is a breath of fresh air. On the trail my brain is fried and I just want to see where I am, how far the next refuge is, and the profile ahead. Nailed it.
Runs super smooth on mobile. Doesn't completely fry your phone battery either, which is usually the curse of web-based mapping tools in the mountains.
The elevation tracking relative to where you actually are on the route is so well implemented. No more guessing 'is that final ridge the last one?' — you can see the reality on the screen.
Passed a couple of struggling hikers at the refuge who were wrestling with a messy paper map and a dying generic app. Showed them your site and they bookmarked it instantly.
If you're heading to Corsica or doing the Tour du Mont Blanc, scrap the heavy map apps and just keep a shortcut to these on your home screen. Absolute game-changer.
No fluff, works offline when it matters, and keeps you on the right path. What else could a thru-hiker ask for?
Absolute perfection. Please make one for the Haute Route next!