A pre-dawn swim, demanding climbs and a mountain trail define this event in Jaén.
Setcases will host the race on September 5, 2027, but route, registration and start-time details are still pending.
Two routes, Ebro Valley trails and an autumn race starting in Lodosa.
A mountain loop, hourly starts and a full night on the move shape this demanding León race.
Cantimpalos will host its duathlon again in August, but some details of the 2027 course remain to be confirmed.
The event connects the Pyrenees and Catalan coast over 32 legs, with teams of up to 12 runners and overnight racing.
The race will once again link Palas de Rei and Melide in June, although some details of the next edition are still pending.
Two days of sport in Béjar will feature an ultra, a marathon, a shorter run and mountain bike courses.
The Toledo-area event has a date, three race distances and a separate hiking option.
Covadonga hosts a mountain trail event on May 8, featuring two distances and a course shaped by the Asturian landscape.
3rd PROVITAL Backyard Ultra Gran Canaria: 15 May 2027 at El Confital. Unlimited 6.706 km laps, Challenge, Fun Run, and entries from 12 November.
Beasain brings back its mountain marathon in July 2027, with a demanding climbing profile.