Race Day at Vichy: Timeline, Cut-Offs and Plan B

The Days Before: Decisions to Lock In Early

At Vichy there are three decisions you need to lock in before race day, not during it.

First: wetsuit or swimskin. The stated average water temperature is 22°C, but in 2023, during the heatwave, the water was around 26°C and wetsuits were banned (the rule sets the limit at 24.5°C). The organizer itself recommends packing a swimskin too. So: both go in your bag, and in the months beforehand you need to have trained to swim 3,800m without the extra buoyancy of a wetsuit. If you find out about the ban on race morning and you've never tried it, you're already starting at a disadvantage.

Second: nutrition. On course you'll find Maurten (GEL 100, CAF 100, Gel 160, Solid 160) and PH 1000, with 8 aid stations on the bike and 4 zones per lap on the marathon. Either you've trained with these products, or you have a self-supported carry plan that's already been tested. There is no sensible third option.

Third: the heat plan B. In 2023 the marathon was run in 35-37°C with peaks of 38°C. Before the race, write down your thresholds: at what cardiac drift you slow down, at what point you switch to "finish, don't race the clock" mode.

The Morning: Start and Swim

The pros go off at dawn, age groupers follow with a rolling start; check exact times on the official website close to race day. The swim is a single 3,786m lap in the calm waters of Lac d'Allier: no ocean currents, a natural setting, generally manageable conditions. Swim cut-off: 2h10. A note from race reports: the first 2.5km of the bike along the lake are slippery when wet, so exit T1 with caution, not adrenaline.

The Day on the Bike: Management, Not Heroics

The bike takes up the heart of the day: 180.2km with an official 2,110m of climbing (2,300-2,400m according to reports). The mental timeline: 15 flat kilometers to Saint-Yorre, then two laps of the big 70-72km loop from Cusset, with La Guillermie (9.5km at 3.7%), the 16km climb at 3%, and Châtel-Montagne. The heat builds as the hours pass: the second lap will be hotter than the first, all else being equal. Cut-off: swim+bike completed by 11:00 according to the data we've gathered — verify the exact interpretation on the official website, because for finishers on the bubble, this number decides the strategy for the entire morning.

Classic mistake number one at this race: pushing on the fast first section and the climbs of the first lap, then arriving at T2 cooked during the hottest hours of the day.

The Afternoon: The Marathon in the Worst Hours

By design, the marathon falls in the early afternoon — the hottest part of the day. The course is flat and fast, 4 laps around the lake, but the race here is decided by your stomach and the temperature. Routine at every aid station: drink, cool down with water on your body, check how you feel. If your heart rate climbs at an unchanged pace, slow down immediately: it's cheaper to lose 10 seconds per kilometer now than to walk the last 10km.

The Finish Line and Your Margins

Total time limit: 16 hours. Our guideline splits (our estimates, not official data) range from ~9:45 for a top age-grouper to ~14:45 for a relaxed finisher. If your realistic scenario is over 14 hours, do the math on the intermediate cut-offs before the race, on paper, with margins for mechanical issues and for the heat.

The Classic Mistakes, in Short

1. Showing up without a swimskin and finding out about the wetsuit ban that morning. 2. Burning your matches in the first 90km of the bike. 3. Never having tested the on-course nutrition. 4. Ignoring cardiac drift on the marathon until it's too late. 5. Not knowing the technical points of the bike course (Les Corres, Puy-Guillaume, rough tarmac at km 124-132).

Race day at Vichy rewards those who arrive with their decisions already made. On race day you execute plans: you don't improvise them.