Swiss Irontrail: Course, Elevation & Route Profile

Course & Elevation

The day turns steep immediately: the first climb begins after 650 metres, almost three kilometres averaging 16 percent out of Savognin over the high pastures. From kilometre 9.5 comes the long pull into the Val d'Err, nearly five kilometres at 11.5 percent, and above the Alp Flix the hardest passage of the first half: a kilometre at 22 percent up to the Fuorcla digl Leget, known here as the gate of heaven.

The middle of the course is pure pass country. Past the chain of lakes at Leg Grevasalvas the route reaches the Lunghin pass, the only triple watershed in the Alps, from where water leaves for three different seas by way of the Rhine, the Danube and the Po. Then come the Septimer pass, in use by the Romans as early as 15 BC, the Forcellina, and the high point of the race at Uf da Flüe at 2,775 metres, before the Stallerberg drops to Bivio. The second half runs over Marmorera, Mulegns and Sur back up onto the Alp Flix, another good four kilometres at almost ten percent from kilometre 63.6, and only then does the descent over Rona and Tinizong to Savognin begin.

The terrain is alpine and in places high alpine, and the numbers say so plainly: only six percent of the course is flat, with roughly 30 percent each in the steep uphill and steep downhill bands. The Alp Flix is a moor landscape of national importance holding the lakes Lai Neir and Lais Blos, and the Val d'Err is a quiet high valley of mountain streams. Aid stations are ten to fifteen kilometres apart, no cups are handed out, and the T78 has no drop bag.

Pacing Strategy

With a 21 hour limit and close to five thousand metres of climbing, the night is not decided by pace but by the ability to hold the same low intensity for eighteen hours. The opening three kilometres are already a 16 percent climb, in the dark and on a cold body, and any rhythm that feels good there is already too high. Hiking the steep ramps is not a fallback here, it is the planned mode of travel.

The race is decided on the second climb onto the Alp Flix from kilometre 63.6. Four kilometres at ten percent is moderate in isolation, but it arrives after four passes and some 3,500 metres of accumulated climbing, with fourteen kilometres of descending still to come. Whoever has protected their legs for the downhills up to that point runs the last section; whoever has not, walks it.

The second trap is fuelling. Ten to fifteen kilometres of alpine terrain separate the aid stations, and since no cups are provided, your entire fluid intake depends on what you carry. Expect strong high summer sun over the passes and, at the same time, the real possibility of snowfall above 2,000 metres, and plan your kit for the worse of the two.

Training plan for Swiss Irontrail: 12-week build

Twelve to eighteen hours is realistic for a well prepared age-group runner, against a limit of 21. The character of the effort is low intensity throughout but extremely long, with eight categorised climbs and as many descents and essentially no flat recovery. What you prepare here is not pace, it is time under load.

The core is long mountain sessions of 1,500 to 2,500 vertical metres plus back-to-back day blocks, so the body knows what running on tired legs feels like. Add targeted strength endurance for steep hiking with poles and trunk and leg strength for the descents; with roughly 4,600 measured metres of descending, the eccentric load matters at least as much as your climbing ability.

The terrain demands its own preparation. The passes between the Fuorcla digl Leget and the Stallerberg are high alpine, rocky in places and exposed, and the organiser names sure-footedness explicitly as a requirement. Train technical descending when tired rather than only on fresh legs, and get used to altitudes around 2,500 metres; the organiser recommends five acclimatisation days above 1,200 metres.

Two logistical points belong in training too. A four in the morning start means three to four hours of running by head torch, and that has to be rehearsed. And because there is no aid for ten to fifteen kilometres at a stretch and no drop bag at all, the entire race and drinking strategy has to be run through with your own pack in long sessions, mandatory kit from rain jacket to survival blanket included.