Why Hike It

A technical mountain route across Corsica known for steep terrain, rocky sections, and hut-based staging.

GR20 is often considered one of Europe's toughest short-to-medium mountain thru-hikes. It is physically compact but technically demanding, with frequent steep terrain, uneven rock, and sustained daily elevation change.

Trail Snapshot

• Distance: 180 km
• Typical duration: 15 days
• Difficulty: Hard
• Route style: Point To Point
• Elevation gain: 12,000 m
• Primary accommodation: huts, tent

Highlights and Signature Sections

• Northern half: Generally more technical with steeper, rougher movement
• Central ridgelines: Repeated high transitions and exposed mountain scenery
• Southern sections: Still demanding, often with faster rhythm in stronger weather
• Refuge network: A distinctive hut-and-camp pattern that shapes daily stages

Trail Photos

Photo source: Italian occupation of Corsica on Wikipedia

Season Window

• Recommended months: June, July, August, September
• Typical pattern: Peak season has best infrastructure access but can be crowded and storm-prone.
• Practical note: Start early each day to reduce afternoon thunderstorm exposure on high sections.

Logistics: Food, Water, and Sleep

• Resupply: Most itineraries are built around refuge access and selected town links.
• Water: Source availability can vary with heat and season; carry treatment and daily margin.
• Sleep setup: Refuges and tent platforms are the core overnight pattern.
• Strategy: Reserve critical nights where needed and keep at least one flex day for weather.

Difficulty by Region

• Northern stage: Highest technical demand and slower movement per kilometer
• Mid stage: Sustained climbing and descending with little recovery terrain
• Southern stage: Faster potential pace but still sensitive to weather and fatigue

Permits and Rules

• Permit required: No, but local rules may still apply by section
• Official source: https://www.visit-corsica.com/
• Check current permit, access, and land-management updates before departure, especially for seasonal restrictions.
• Wild camping: Wild camping is not the standard GR20 setup because refuges and designated bivouac areas dominate most stages; Corsican protected-area rules vary by refuge zone and season, so confirm current camping restrictions before stopping outside official areas.

Gear Watch

• Foot system: Prioritize fit, blister prevention, and quick-dry layering before saving grams elsewhere.
• Sleep and shelter: Match insulation and weather protection to the coldest likely nights in your window.
• Navigation and power: Keep offline maps, charging margin, and a simple redundancy plan.
• High terrain margin: Keep extra warmth and traction options if shoulder-season conditions are possible.

Hazards and Cautions

• Technical slips on rocky and exposed sections when rushed or fatigued
• Heat and dehydration pressure during peak summer periods
• Thunderstorm exposure on high ridges and passes
• Overuse injuries from daily steep ascent and descent cycles

First-Time Thru-Hiker Strategy

• Underestimate pace targets and treat technical terrain as the main limiter.
• Keep pack weight disciplined to reduce cumulative stress on descents.
• Start early and finish before late-day weather becomes a factor.
• Use rest and nutrition actively rather than waiting for fatigue to accumulate.