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.

The festive race is scheduled for Dec. 12, with a 5K and children’s events awaiting final details.

Asphalt, coastline and four distance options shape this December sporting event in Corralejo.

The event is scheduled for December, with popular running, children’s categories and a rural setting in Málaga.

The Barcelona-area race is expected to return after a cancellation linked to health restrictions.

The Malgrat event is scheduled for Dec. 8; start times, course details and registration information have yet to be announced.

Two days of mountain sport bring an uphill time trial, a demanding trail race and activities for all ages to Benahavís.

A local 7.2-kilometer race will cross Porqueres and Camós on the morning of December 8.

Aiguafreda’s event brings together trails, village streets and local tradition; published distance details do not all match.

A full morning of cross-country running in Segovia, with races for all ages and a four-kilometer community event.

The Córdoba race has a confirmed date, but its route, schedule and registration details are still pending.

A festive 7.2-kilometre race will bring civilian and military runners together in Cartagena.

The Balearic race has a confirmed date and location, but its schedule, course and registration details are still pending.