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.

A five-kilometer trail event in the Maresme, with the course still to be confirmed and a one-kilometer children’s race.

A winter gathering among La Mancha’s windmills offers routes from 10.5 kilometres to the full marathon distance.

The event is scheduled for Dec. 20 in Madrid; practical details for this edition are still pending.

The festive town race returns to Xirivella on December 20, though several details are still to be confirmed.

Ávila will welcome runners in December. Here are the schedule, fees and practical details for the Dec. 20 event.

Piedras Blancas will host the race on Dec. 19; the route and other details are still to be confirmed.

Date, distance, price and differing published details about this mountain race in Almadén de la Plata.

Cártama plans a community race day with events for different ages and a festive option for runners in costume.

The Tenerife race has a confirmed date and location, but key details for participants have yet to be published.

Navia and Samil will host a festive new running event with two distances and limited places.

The five-kilometer event returns to Irun in December, while course and registration details remain unconfirmed.

The Biscay event combines two distances with options for running, hiking or taking part with a dog.