Find the best calendar of popular races, marathons, half marathons, and 10K events. Dates, registrations, and all the details for your big challenge, right here.

Four distances, tiered entry fees and a children's race feature in the May event in the Basque capital.

Four days in Espadán bring two mountain races and a team adventure, with further details still to be announced.

Two distances and entries from €27 for mountain racing in Confrides on May 8, with registration scheduled for February.

From May 6 to 8, La Palma will host four trail racing formats, each presenting a different mountain challenge.

Three days of coastal trail racing in Menorca, eight formats and a waiting list that does not guarantee entry.

The April event in Forna features an ultra, half marathon and sprint trail, with entry fees and registration dates announced.

Castellón hosts the 60 km and 106 km races on April 24. The date is confirmed, while further race details remain pending.

Two cycling routes through vineyards and a Sunday of running: the April race weekend taking shape in Jerez.

Two race days, a 100-kilometre format and category-specific entry fees shape the next edition of Mogán’s triathlon.

Three stages from Blanes to Colera: confirmed dates, coastal routes and the differences between entry options.

Paüls prepares for two days of trail running in April, with confirmed dates but conflicting published race formats.

Four routes cross Mallorca’s mountains in April, including a 122-kilometre ultra and a shared finish in Peguera.