21 kilometres, 601 metres of elevation gain and 700 participants: these are the characteristic numbers of the 12th Seiser Alm Half Marathon on 6 July 2025. The starter's gun for the running event with start and finish in Compaccio is fired at 09.00 a.m. Surrounded by the Dolomites UNESCO World Heritage, the Seiser Alm Half Marathon is a unique experience and sporting challenge for both professional and amateur athletes. 

The Seiser Alm Half Marathon is limited to 700 participants.