Innsbruck Alpine Trailrun Festival K110: Midnight City Start and 4,890 D+ of Elevation, at Austria's Largest Trail Running Festival

There is a significant discrepancy between sources. The official race website publishes 4,890m D+; the UTMB Index certification lists 5,150m; and GPX analysis of the course file produces 5,500m (though the GPX elevation is noted as slightly outside ±10% tolerance). The most conservative official figure is 4,890m. The D+/km rank in this database (204th out of 390) is based on the GPX-derived 48.8m/km. The biggest single descent drops 1,064m at a -12.23% average gradient (ranked 155th most dramatic of 390); the biggest single climb rises 598m (ranked 103rd of 390 for magnitude — top 26%). Course distance: 112.6km nominal (111.36km GPX actual; UTMB Index lists 106.1km). Loop format, start and finish at Landestheater Forecourt Innsbruck.

The K110 Masters of Innsbruck starts at 12:00 AM midnight (00:00) from the Landestheater Forecourt in Innsbruck city centre. The race is a full night start — runners leave the city at midnight and ascend directly into alpine terrain in darkness. The mandatory race briefing takes place at 6:00 PM the evening before; drop bag pickup is open 7:00–8:30 PM; luggage depot opens at 10:30 PM. The K85 distance starts simultaneously. Cheering buses (hop-on, hop-off) run along the route for spectators. The K65 starts at 5:30 AM the following morning; other festival distances start throughout May 2.

Yes — the K110 Masters of Innsbruck is a UTMB Index 100K race. In 2026, 302 runners received a UTMB Index finish result (confirmed from the UTMB Index results page). The race is NOT a UTMB World Series event — it does not award UTMB Running Stones or directly qualify for UTMB World Series finals. It is independently certified under the UTMB Index 100K category, meaning finishers earn UTMB Index points under that classification. The event is named K110 for its approximately 110km nominal length; the DTR database records the distance at 112.6km (Airtable) while the UTMB Index lists 106.1km.

Innsbruck Airport (INN) is approximately 15 minutes from the race start at Landestheater Forecourt — one of the shortest airport-to-start transfers of any major Alpine ultra in Europe. Munich Airport (MUC) is an alternative at approximately 2–2.5 hours by car. Public transport is excellent: Austrian Federal Railways (ÖBB) is a named race partner, and the Landestheater Forecourt is reachable by Innsbruck city transit. Accommodation is easy and abundant in Innsbruck city with no race-weekend scarcity noted in logistics data. No car is required for runners flying into INN.

The Heart of the Alps Ultra (K85) is the 87km distance at the Innsbruck Alpine Trailrun Festival, covering 86.8km and 3,880m D+ in a loop around Innsbruck through the Nordkette mountain range. First held in 2016 — four years before the K110 Masters of Innsbruck — it is the older of the two flagship ultra distances at IATF. The 2026 edition was the 11th running. The festival covers 12 distances ranging from an 8.2km Businesstrail to the K110 at 112.6km, with a city-centre expo at the Landestheater Forecourt, a Trail Hunt race with €30,000 prize money, and a hop-on hop-off cheering bus for spectators. The K85 starts simultaneously with the K110 at midnight on May 2. IATF27 runs May 5–8, 2027.