El Trébol de Gredos Sur is a mountain race organised by the Grupo Gredos de Montaña and linked to the Festival de la Montaña de Arenas de San Pedro. The most recent edition identified with complete data was held on Sunday 9 November 2025 in this town in Ávila, within the November sports programme promoted together with the Town Council. The event brought together two trail routes for adults, with separate classifications over 14 km and 29,2 km. Their courses ran through the surroundings of the Sierra de Gredos on the south-facing side, starting from Arenas de San Pedro. No set of rules or an entry page for that edition has been found that would make it possible to reliably confirm the official elevation gains, the prices or the deadlines for each category.
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