Itzulia 2025 will start with an individual time trial as was the case last year. An 18.70 km stage with the start and finish at the Buesa Arena stadium in Vitoria-Gasteiz. The first half of the stage includes several steep climbs which may highlight certain small differences. The steep climb to the village of Arzubiaga will be a scoring stage and decide the first winner of the mountain jersey. The terrain is favourable from Libiano, making this section the fastest and most favourable for specialists. The stage is not expected to produce big differences between the favourites but will nonetheless decide the first rider to lead the Itzulia 2025.