IRONMAN Kärnten-Klagenfurt: Course, Elevation & Route Profile

Course & Elevation

The swim covers 3,800 metres in the Wörthersee, starting and exiting at the Strandbad Klagenfurt. The bike course leaves the lake at around 440 metres and stays good-natured for a long time: a short rise at kilometre 8, then Carinthian hill country with long rolling sections. More than 36 percent of the bike course points downhill, more than points up.

The course shows its teeth in two places, at kilometre 35 and at kilometre 65: first a 1.4 kilometre climb at 6.2 percent with ramps over 12 percent, then a longer 2.4 kilometre drag up to the high point of the course at just over 640 metres. Both sequences return identically in the second half of the bike leg at kilometre 122 and 152, only by then more than a hundred kilometres are already in your legs.

The marathon runs two laps through the centre of Klagenfurt and finishes at the Metnitzstrand. 87 percent of the run is flat and there are no gradients worth the name. That turns the run into a pure test of pace with no change of rhythm, and without the short walking breaks that climbs on other long-distance courses hand you whether you want them or not.

Pacing Strategy

On a course with 11.7 metres of climbing per kilometre it is not climbing strength that decides the day but the spread of your power. The long descending sections tempt you to keep pressing rather than use them to recover, and that is exactly where the matches disappear that you will want in the marathon.

The decisive section is the second pass over both climbs from kilometre 122. Taken on their own they are unremarkable, but they arrive at a point where many athletes are already at the limit of their fuelling plan. If you can put out the same power there as the first time round, you have paced correctly.

The main trap comes after that. A flat marathon is effortless to start too fast, because nothing slows you down. Over two laps without elevation, every quick opening is repaid one for one on the second lap. Plan the first lap deliberately slower than the second.

Training plan for IRONMAN Kärnten-Klagenfurt: 12-week build

For age-group athletes the day typically lasts between 10 and 14 hours. The demand is remarkably even: no mountain passes, no technical descents, but six to seven hours on the time-trial bike in an almost constant position, followed by a marathon with no relief from changing terrain.

The decisive phases are the repeats of the climbs at kilometre 122 and 152 and the second marathon lap. Both ask less for peak power than for the ability to hold a chosen intensity for hours without unnoticeably raising it. That control is hardest to keep on a course without long climbs, precisely because the terrain never enforces it for you.

Training should therefore emphasise long rides in the aero position within a narrow power band, deliberately including slightly downhill terrain where that discipline is hardest to keep. Add brick runs of 45 to 75 minutes at planned race pace straight off four to five hours on the bike. The flat course makes race pace precisely measurable, which simplifies training and at the same time lowers the tolerance for error: when every minute comes straight out of your pace, the course forgives no unplanned surges.

Two further points belong in the plan: practising fuelling across the full bike duration, because this profile hardly ever offers a climb that forces you to sit up and drink, and heat tolerance, since the marathon runs on city asphalt where running speed generates almost no cooling airflow.