KAT100 by UTMB, live.

Dusk on the Wildseeloder, dawn on the Kitzbüheler Horn

Five races out of Fieberbrunn in the Kitzbühel Alps, and the longest one is timed so that its runners see a sunset, a whole night and a sunrise from the ridges.

KAT100 by UTMB runs from Thursday 5 to Saturday 7 August 2027 with Fieberbrunn as its home. The 100 Miles leaves at 18:00 on Thursday for 169 kilometres and 9,000 metres of climbing, with 45 hours to get back. The Endurance Trail starts at 23:59 on Friday in Kitzbühel and runs 75 kilometres and 4,100 metres back to Fieberbrunn. On Saturday the Marathon Trail (52 km, 3,100 m) goes at 07:00, the Speed Trail (24 km, 1,650 m) at 09:00 and the Easy Trail (8 km, 250 m) at 17:00.

The organiser describes the long race in terms of light rather than kilometres: golden hour on the Wildseeloder, the lit Jakobskreuz in the night, and sunrise on the Kitzbüheler Horn. In between are panoramic ridgelines, rocky passages and the grassy mountains that give these Alps their shape. The Endurance Trail climbs the Hahnenkamm above Kitzbühel in the dark and comes home on the Fieberbrunner Höhenweg. The Marathon Trail is now one continuous loop along the border between Tyrol and Salzburg.

Most of that is far from any road, and a lot of it happens at night. On Livebib the runner shares a link to their own broadcast, and family and friends open it in a browser, with no account and no app. They see the position on the course line, the distance covered and a finish estimate that updates as the race goes. When a phone loses signal on a ridge, the position is carried forward along the course and marked as estimated, never frozen and never shown as measured. The runner decides who gets the link.