GR20 Corsica: A Trail Guide to Europe's Toughest Trek
- Location: Corsica, France
- Distance: ~125 miles (200 km)
- Elevation gain/loss: ~41,915 feet (12,775 m) total
- Start / Finish: Calenzana / Conca
- Duration: ~14-16 days
- Best season: Mid June-early October
- Trail type: Point-to-point
What is the GR20?
The Corsica GR20, often referred to as “Europe’s Toughest Trek,” crosses Corsica's mountainous north-south spine from Calenzana to Conca, covering roughly 125 miles of granite ridgeline and scree. First waymarked in the 1970s, the GR20 trail is one of the most famous thru-hikes in Europe. The highly technical GR20 Corsica route keeps hikers in the mountains for days at a time, so proper gear, preparation, and fitness levels are vital to completing it.
GR20 stages and north vs. south
The GR20 hike is split into 16 official stages that vary in length from 3.75 to 15.5 miles. While most hikers cover the GR20 distance from north to south (Calenzana to Conca), it’s possible to thru-hike in either direction. The GR20 Corsica’s difficulty level is generally higher in the more technically demanding northern portion, while the southern half features gentler gradients.
North (Calenzana > Vizzavona) | South (Vizzavona > Conca) | |
|---|---|---|
Difficulty | Contains higher passes and more cols, with ridges and steep rocky descents | More long, exposed ridge walks than steep slopes |
Distance | 66.8 miles | 57.6 miles |
Elevation gain | 24,068 ft | 13,097 ft |
Terrain | Remote, high-mountain terrain | Mix of narrow paths, dirt roads, and tracks across scrubland and forested slopes |
Best time of year | Snow can linger into early summer in shaded gullies and on the high ridge, so this section is best hiked between mid-June and October | Temperatures can reach up to 90 Fahrenheit in midsummer, so this section might be more comfortable in early or late summer |
GR20 route: terrain highlights
Starting from the north, the GR20 trail follows the Pointe des Éboulis variant, a chain- and ladder-assisted passage over rock slabs. Farther along, the Cinque Frati granite towers break up the rock between Ciottulu di i Mori and Manganu. In the south, the Bavella needles introduce vertical granite formations near Paliri, while a detour from Usciolu climbs Monte Incudine, the highest peak in southern Corsica at 7,001 feet.
Hiking the Corsica GR20
Hiking Corsica's GR20 is a true physical challenge, so realistic pacing, smart sleeping arrangements, and informed gear choices are key to managing the GR20 hike. Prioritize finding comfortable hiking shoes, learning how to pack light, and understanding what to wear when hiking in different conditions.
How hard is the Corsica GR20?
The GR20 is rated among the most physically demanding long-distance thru-hikes in Europe. Daily elevation gain often exceeds 3,000 feet, and loose scree makes shoes with good traction a must. Consider these loose rocks and pebbles when deciding on hiking shoe cuff height, as well, and take terrain, fitness level, and pack weight into account when choosing the right hiking boots to make the route feel more approachable.
How long does the Corsica GR20 take to hike?
Most hikers complete the GR20 Corsica trail in 14-16 days, while trail runners sometimes finish in 5-7 days. In July 2026, Salomon athlete François D'Haene set a new record for the GR20 trail, finishing in 29 hours and 46 minutes to become the first athlete to complete the route in under 30 hours. With a typical duration of about two weeks, choosing the right hiking backpack and following tips to pack lighter will greatly improve the experience.
Where can you sleep on the GR20?
Staffed refuges run by the Parc Naturel Régional de Corse provide dormitory beds or camping platforms, with reservations available through the park's booking system. Booking ahead of time is recommended, especially during the busy season in July-August.
GR20 hike: equipment and gear
The right hiking equipment is vital for staying safe and comfortable during the GR20 hike. Be sure to break in your hiking shoes before setting out and determine your preferred method for staying hydrated on the trails. Essential gear includes:
- Durable hiking shoes
- Hiking clothing with moisture-wicking, breathable layers
- A flask, reservoir, and/or hydration vest
- A hiking backpack
A 30- to 35-liter pack will generally suit hikers who skip a tent and book refuge bunks, while camping the full route typically requires 45 liters or more. Other hiking accessories or aids like trekking poles could be a nice addition to your GR20 equipment lineup.
Common queries about the GR20 trail
Is the GR20 Corsica crowded?
Crowd numbers on the GR20 Corsica mountain trail vary by time of year. July and August see the heaviest traffic, with refuges regularly booked to capacity. June and September offer similar weather and fewer fellow hikers, but as long as everyone observes proper trail etiquette, bigger crowds could provide welcome company.
What is the dropout rate for the GR20?
Exact records are hard to come by, but hikers attempting the full crossing often underestimate the technical demands of the GR20 hike, which can lead them to drop out before finishing. Understanding the terrain and its challenges and focusing on the proper trekking preparation and gear selection can help increase your chances of completing the route.
Can you wild camp on the Corsica GR20?
Camping is prohibited outside designated refuge platforms within the Parc Naturel Régional de Corse, with fines enforced for unauthorized tents.
The GR20: Corsica’s famed thru-hike
The GR20 in Corsica is a 125-mile trail that rewards hikers for their commitment and endurance with incredible, high-mountain views. There are plenty of options for completing the GR20 distance, from one stage a day going north to south to reversing the route and running three stages in a go. These various approaches to Europe’s toughest trek help explain its enduring popularity within the trail community.
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Originally published 21 Aug 2026