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The GR20 south-to-north reverse trek flips the classic route, starting at Conca's balmy southern forests and climbing into the island's granite spine toward Calenzana. This direction eases you in with smoother trails before unleashing the north's brutal ascents and technical ridges, building stamina for the toughest sections. Spanning 180km and 12,000m elevation, it showcases Corsica's wild diversity from maquis scrub to glacial cirques, drawing hardcore hikers who crave the challenge without northern snow risks early season.
Kick off with gentle southern stages through chestnut woods to Vizzavona, then tackle northern highlights like the Cirque de la Solitude's chains and Bocca di Vizzavona's passes. Summit peaks such as Monte Incudine for sea-to-mountain vistas and spot mouflon in high pastures. Cap with coastal descents near Calenzana, blending alpine ruggedness with Mediterranean finishes.
Prime months run June to September, with June ideal for reverse to melt northern snow by arrival; expect hot southern days (30°C) cooling to crisp nights. Trails mix granite scrambles, ladders, and river crossings—prepare for 6-9 hour days with 1,000m+ gains. Acclimatize in Ajaccio and test fitness on local hikes.
Corsican bergeries serve brocciu cheese and wild boar stews at refuges, fueling treks amid a culture of fierce independence. Locals view reverse trekkers as savvy, avoiding crowded northbound traffic. Engage at trailhead bars in Conca for route beta from grizzled guides.
Book refuge beds or tent pitches months ahead via the Parc Naturel Régional de Corse website, as south-to-north slots fill slower than traditional direction. Start from Conca in early June to dodge northern snow while southern trails dry out. Allow 12-16 days for the full 180km, splitting into 9-day northern push post-Vizzavona.
Train for technical scrambles with via ferrata practice and pack light at 8-10kg base weight. Carry water purification for streams, as southern taps run dry in heat. Download offline GPS tracks from GR20-infos.com and check weather via MeteoFrance for sudden storms.