GR20 Trail

Classic high-level traverse across Corsica from north to south.

Time to Hike: 15 days is typical for the full 180 km route, with daily stages commonly 10 to 15 km but with large elevation gains and long walking hours on hard terrain.

Best Time to Go: Late June to early September when most high passes are snow-free and the mountain refuges operate; July and August are busiest.

Getting there: Fly or ferry to Calvi, Bastia or Ajaccio then take regional buses, shuttle or taxi to the trailheads at Calenzana (north) or Conca (south). Most walkers begin at Calenzana and head south to Conca.

Costs: No general permit is required but expect refuge fees for bunks and meals; budget varies widely but plan on paying for multiple refuge nights and food resupplies or carry camping gear where allowed. Book refuges in high season to avoid surprises.

Difficulty: Considered one of Europe’s toughest waymarked trails - sustained steep, rocky and often exposed terrain with scrambling sections. Good fitness, surefootedness, ankle-strong boots and confidence on exposed ridges are essential, and weather can create additional hazards.

The GR20 crosses the heart of Parc Naturel Régional de Corse, alternating between alpine granite ridgelines, steep scree slopes, glacial lakes and pockets of dense maquis. Highlights include panoramic views toward Monte Cinto, dramatic towers such as Paglia-Orba and the deep, stony valleys that drop toward the coast, giving a powerful sense of remoteness despite the route s waymarking.

Accommodation is a mix of staffed mountain refuges that offer bunks and meals and basic bivouac options; water is generally available at refuges and springs but filter treatment is prudent. The route is notable for the sustained technical challenge over many consecutive days rather than a single hard pitch, making it a true test of stamina, equipment and mountain skills.

The nearest airports and major ferry ports are Calvi, Bastia and Ajaccio, all of which have regular connections from mainland France and Europe in summer. From these hubs, regional buses or private transfers link to the northern trailhead at Calenzana and the southern end at Conca.

Logistics are commonly arranged so hikers start in Calenzana and walk south to Conca; this direction is slightly better for water and refuge spacing for many itineraries, though either direction is feasible.

The walkable season is typically late June through early September when the high passes are mostly clear and most refuges are staffed. Snow can linger into June at higher elevations and conditions vary year to year, so check recent reports before travelling.

Refuges become crowded in July and August so reservations are strongly advised for those nights; expect sudden summer storms, strong sun on exposed ridges and windy conditions, so carry appropriate clothing and a plan for weather-delayed stages.