Marathon races near Biarritz

Kaxtrail Mendi Lasterketa is a mountain trail race held in Erratzu, a village in Navarra, northern Spain, scheduled for October. The main event, Lasterketa Osoa, spans 45 kilometers with 2,800 meters of climbing, presenting a challenging mountain outing rather than a brief local trail run. The event also offers the Binakako Proba Mistoa, a mixed-pair format, and the Ibilaldi Mendizalea, a mountain-walking option for those who wish to follow the route without competing. Its position on the Navarra running calendar signifies its regional importance, and the Basque names emphasize its local mountain character, rooted in Erratzu and the nearby Pyrenean foothills.

The Semi-Marathon du Pays-Basque Donibane Hondarribia is a 21.097 km half marathon held each October, starting in Donibane Lohizune (Saint-Jean-de-Luz) and finishing in Hondarribia, on the Spanish side of the Basque Country. Its main draw is the border crossing: runners begin in France and end in Euskadi, with a course approved by both French and Spanish athletics federations. The route goes through Saint-Jean-de-Luz, Ciboure, Hendaye, and Fontarrabie before concluding in Hondarribia. The race is organized by the club Ur J, requires a medical certificate from participants, and provides each runner with a bib printed with their name. A portion of the race's income supports social causes, and the event causes traffic disruptions in several Basque Country municipalities on race day.

Senpereko Trail is a weekend trail-running series held in Saint-Pée-sur-Nivelle, Pyrénées-Atlantiques. It features four races and two hikes, with distances ranging from the 10.8 km Ibar Run Trail to the 81.9 km Tontorrez Tontor. The shorter race involves a 420-metre climb, and the longest route gains 4,830 metres, making even the shortest option a substantial mountain run. The courses are set between the Basque Country's Atlantic coast and its mountains, utilizing the peaks surrounding the Rhune massif. Saturday's main events include the 81.9 km Tontorrez Tontor, the 41.9 km Gotorlekuen Itzulia, and the 10.8 km Ibar Run Trail. Sunday features the 21.1 km race with 1,070 metres of elevation gain. The most challenging option includes a loop towards the Bidassoa, offering a more extensive tour beyond the Rhune area for experienced participants.