The GR20 is considered the most difficult and beautiful long-distance trail in Europe. Crossing Corsica from north to south over 180 km, it offers breathtaking landscapes of mountains, forests and high-altitude lakes. Here's everything you need to know to prepare.

The GR20 in numbers

• Distance: 180 km
• Total elevation gain: ~13,000 m
• Number of stages: 16 official stages
• Average duration: 12 to 16 days
• Highest point: Monte Cinto (2,706 m)
• North start: Calenzana
• South finish: Conca

GR20 stages

Northern section (Calenzana → Vizzavona) — Most technical

The first 8 stages are the most physically demanding. Rocks, scrambling sections, snow patches early in the season. This is also where the most spectacular scenery is found.

Southern section (Vizzavona → Conca) — More accessible

The last 8 stages are less technical but still demanding. Landscapes shift to pine forests, plateaus and natural pools.

When to go?

The GR20 season runs from mid-June to mid-October:

• June: Fewer people but possible snow patches at altitude
• July-August: Optimal conditions but heavy crowds
• September: Ideal — fewer people, still good weather

Essential gear

• Hiking boots — high-cut and rigid (mandatory)
• Backpack — 40-50L maximum
• Sleeping bag — comfort 5°C
• Trekking poles (strongly recommended)
• Technical clothing — layers + waterproof shell
• Filtering bottle or purification tablets
• GPS watch to record your trace

Budget

• Refuge: €14-16/night (dormitory)
• Bivouac: €7/night (next to a refuge)
• Refuge meals: €15-25 per meal
• Total budget: €500-800 for 16 days (excluding transport)

Our tips for a successful GR20

1. Train at least 3 months before with mountain hikes
2. Book refuges in advance (mandatory in high season)
3. Start early (6-7am) to avoid heat and storms
4. Lighten your pack — every gram counts over 16 days
5. Record your GPS trace to create your Paperoad poster afterwards