Adunako VIII Mendi Duatloia 2026: date, start time and course

Plan your race pace

Aduna will host a new edition of its mountain duathlon on Saturday, November 28, 2026. The start is scheduled for 3 p.m. at Herriko Plaza, and the course alternates mountain running with mountain biking: 3.66 kilometres on foot, 14.5 by bike and a final 1.83-kilometre running stage.

The event listing shows an entry fee of 20 euros and says registration remains open until 11:59 p.m. on November 23, subject to the platform’s terms. The three stages add up to 20 kilometres, but that total combines different disciplines and is not equivalent to a conventional race over the same distance.

A mountain event on Aduna’s calendar

Adunako Mendi Duatloia is a cross duathlon held in Aduna, a municipality in Gipuzkoa. Its format brings together two running stages and a central mountain-bike section, so the effort is not concentrated in a single discipline. The 2026 calendar sets the event for November 28, during an autumn period when trail conditions can change quickly.

The event appears as Adunako VIII. Mendi Duatloia on the registration platform. The Roman numeral identifies the announced edition, while the published date corresponds to 2026. The available details name Aduna Town Council as organiser and say registrations are handled by the Basque Triathlon Federation through RockTheSport.

The start is scheduled for 3 p.m. at Herriko Plaza. That is the clearest location for finding the beginning of the event; the available information does not specify where the transition area or other operational spaces will be. Further logistics should therefore be confirmed through the registration platform or official event information before travelling.

Three stages with a demanding profile

The published course begins with 3.66 kilometres of mountain running and 118 metres of positive elevation gain. Next comes the mountain-bike section, 14.5 kilometres long with 541 metres of climbing. The event finishes with another 1.83 kilometres on foot, adding 59 metres of ascent. Together, the running stages total 5.49 kilometres; cycling accounts for most of the distance and elevation gain.

Adding the listed climbing figures gives 718 metres of positive elevation gain across the course. That is significant for a combined 20-kilometre event: elevation and discipline changes make the physical demands quite different from those of a flat race of a similar distance. The 14.5-kilometre cycling section, with 541 metres of ascent, is the main climbing block described in the available information.

The format calls for managing different kinds of effort without losing momentum. The first running stage begins the challenge; the bike adds time on mountain terrain, and the final run requires athletes to find their stride again with tired legs. Transitions are part of the competition, although the public listing does not explain their layout or specific rules. It also does not provide a complete map or turn-by-turn route description.

What it means to race a cross duathlon

Unlike a road event, a cross duathlon combines running with mountain biking on a course outside the usual road format. In Aduna, the published sequence starts with a run, continues by bike and finishes on foot again. That rotation changes how athletes distribute their effort: running pace is only one factor, alongside the ability to sustain pedalling and regain a running rhythm after leaving the bike.

Moving between stages usually requires athletes to use a transition area to leave or collect the necessary equipment. The available information confirms the sequence of disciplines but does not specify equipment rules, movement through that area, categories or mandatory gear. Those details should not be assumed: the precise rules must be checked in the organiser’s documentation, especially for a federated event.

The route includes almost three times as much cycling distance as running, but elevation changes how those kilometres should be understood. The 14.5-kilometre bike section cannot be assumed to be easy simply because it is longer. Climbing, terrain and surface conditions affect its duration and difficulty; however, the available listing does not describe the surface or confirm whether there will be mud, rocks or other obstacles.

Date, start time and registration

The event is scheduled for Saturday, November 28, 2026, with a 3 p.m. start at Herriko Plaza in Aduna. The platform consulted says registration opens on July 27, 2026, and closes at 11:59 p.m. on November 23. With the event still ahead and the published registration window in progress, the listing shows registration as open at the time of checking.

One listing gives the fee as 20 euros. Pricing information is not consistent across all the search results consulted, so that amount should be understood as the figure published on that platform, not as a guarantee that there are no extra charges, price changes or special conditions. Before registering, check the final total and the rules shown by the registration system.

Registration is listed as being handled by the Basque Triathlon Federation through RockTheSport. This matters because registration, communications and any changes may follow federation and platform procedures, rather than relying only on general event information. The available details do not say whether a licence is required, whether a one-day licence is available or whether there are separate categories, so those requirements should be checked during registration.

An autumn event on changeable terrain

The date falls in late November, when afternoons are shorter and weather conditions can change within hours. In a mountain event with off-road cycling, rain or damp ground may affect grip and pace, although no reliable forecast is available this far ahead. The date and start time are published; the condition of the course, by contrast, can only be assessed closer to race day.

A 3 p.m. start makes it worth considering available daylight and the time needed to arrive, collect a race number and prepare equipment. The listing does not give a cut-off time, an expected duration or a detailed schedule for race-number collection. It would therefore be unsafe to estimate how long the event will take or how much daylight will remain on every section: the final schedule should be confirmed with the organisers.

Weather is no minor detail in a mountain discipline. Cold, wind and damp conditions can affect comfort and bike handling, but there is not enough information to describe what race day in 2026 will be like. The useful details available now are specific: date, start time, location and the general characteristics of each stage. Advice about mandatory equipment or course rules needs support from regulations that are not included in the reference information.

Aduna as the start and finish point

Herriko Plaza is the stated start location in Aduna, Gipuzkoa. For visitors travelling from outside the municipality, it identifies where the event begins, although the listing does not provide details about parking, public transport, road closures or services available at the square. It also does not confirm whether the finish will be in exactly the same place.

The event is announced in Aduna, and registration details identify the square as the location reference. Without more precise directions, it is best not to assume that every event area — transition, race-number collection and finish — will be there. Herriko Plaza is the confirmed start location; the rest of the logistics may be clarified in later communications.

This distinction also helps readers interpret accommodation and travel information shown on some race-search websites. The supplied details do not include recommended hotels or lodging agreements, so distances and availability cannot be stated without further information. For an afternoon event, travel and race-number collection may require different planning from a morning race, but the complete schedule is not yet included in the reference listing.

Which details are confirmed and which remain unclear

The available information supports a reliable basic event profile: the competition takes place on November 28, 2026, starts at 3 p.m. at Herriko Plaza and has three stages of 3.66, 14.5 and 1.83 kilometres. Their respective elevation gains are also listed as 118, 541 and 59 metres, along with a registration deadline of 11:59 p.m. on November 23.

Some pages contain conflicting or incomplete details. A Basque-language event description included in the supplied information mentions a different date, but the specific listings for the 2026 edition show November 28, which also matches the event date identified for that year. To avoid confusion, the November date in the 2026 listing is the most consistent reference; the isolated conflicting date should not be treated as current.

Distances are also rounded differently on some platforms, where the route is shown as 5 kilometres on foot, 20 by bike and 2.5 on foot. The more detailed listing gives precise figures: 3.66 kilometres, 14.5 and 1.83. Those detailed measurements are more useful and consistent with the published stages, so they should not be replaced by rounded figures that would change the actual total.

A race defined by its transitions

Aduna’s duathlon is distinctive not simply because of its overall distance, but because it links running and cycling on hilly terrain. The first stage opens the event with 118 metres of climbing; the bike section accounts for 541; and the shorter final run adds another 59. That split suggests an event where the challenge is not measured by distance alone, but also by how each change of pace and discipline is handled.

Returning to the run is central to the format: after cycling, athletes must find an effective stride over a 1.83-kilometre stage. There is no need to assign it a technical profile that the documentation does not explain to recognise that it follows the longest section and the one with the most climbing. The route description points to a varied event, but estimated times cannot be established without knowing the surface, exact course, conditions and participants’ abilities.

With its date, start time, location and stages set out, the 2026 edition already offers the essential information needed to understand the event. Regulatory and logistical details that could shape the practical experience remain to be confirmed, from mandatory equipment to how transitions work. In a mountain event, the difference between the general outline and the final rules matters: the listing describes the challenge, while the organisers set its precise conditions.