AI synthesis with sources · 4 min · edition 2027
Logistics in Thun: transition zone at the stadium, race weekend schedule and what to double-check
T1 and T2 at Lachen stadium with non-trivial runs inside transition, registration and bike check-in in the days before: what we know and what you still need to verify for 2027.
The big picture
The race takes place in Thun, in the Bernese Oberland, on July 4, 2027. It's the successor to the historic Zurich race, moved to Thun by the organizer. The city center is the heart of the event: the three-loop marathon runs along the lakefront, through the event zone and the center, which makes the race easy to follow for anyone coming with you.
On accommodation, entry fees and local transport, the sources consulted don't provide any data: check the official website. The usual rule for full-distance races in tourist towns applies: book early and close to the event zone, because the pre-race days with bike, bags and briefing are much easier to manage on foot.
Transition zone: Lachen stadium
T1 and T2 are on the soccer field at Lachen stadium, with T2 laid out in reverse order to T1. Two numbers to memorize:
- ~300 m run from the swim exit to T1.
- ~half a kilometer total inside transition, with a run to the blue bags.
Translation: transitions in Thun are not a minor detail. During your recon, physically walk the full route — swim exit, bags, bike, bike out; then T2 entry, bags, run out. Memorize the location of your spot using fixed stadium landmarks, not your neighbors' bikes (which disappear during the race). And on race day, don't burn energy sprinting to the bags after the swim: 300 m all-out after 3.8 km in 17 °C water will cost you.
Race weekend schedule
In 2023 the format was: registration on Friday, bike check-in on Saturday. That's the standard format, but the 2027 times need to be verified on the official website and in the athlete guide once published. Plan accordingly:
- Thursday/Friday: arrival, registration, optional bike recon of the key sections (the two climbs after the turnaround and the descent with the no-aero zone).
- Saturday: bike and bag drop-off at Lachen stadium, walk-through of the transition zone, then feet up.
- Sunday: race day. Beach start with rolling start by predicted swim time (2024 format).
For your supporters
The run format — three loops through the city center with repeated passes — is ideal for spectators: your family can see you several times without moving much, between the lakefront, the event zone and Schadaupark. The bike is different: two long loops through the Alps, with viewing points to study on the official course map. Agree in advance on two or three fixed spots and estimated passing times.
Checklist of things to verify
Information not available in the sources consulted, to check on the official website as it's released:
1. Exact registration, briefing and check-in times for 2027. 2. Overall and intermediate cut-off times. 3. Detailed wetsuit and no-aero zone rules in the athlete guide. 4. Entry fees and transfer/refund conditions. 5. Race-day parking and road access around Lachen stadium.
One final note: the info sheet we're working from is built from public sources and needs to be checked against the official 2027 documents. Use this article as the framework for your logistics plan, not as a substitute for the athlete guide.