IMOS Beskydská sedmička is a mountain ultra held in late August in the Czech Republic, based in Frenštát pod Radhoštěm within the Beskydy mountains. The event straddles the line between trail running and long-distance hiking. The route covers approximately 100 km with over 5,500 m of elevation gain, unfolding across multiple days instead of a single morning.
The course guides participants through the Beskydy range, meaning the challenge lies not just in the distance but also in the numerous ascents and descents. It is recognized by ITRA and contributes to the UTMB Index, securing its position in the international trail-running schedule. The race attracts a substantial number of participants for its difficulty, with over 1,500 finishers in a recent year. The competition at the front is intense; the winner completed the course in just over 11 hours. The official website provides archives of results, photo galleries, and past editions. This edition marks the 17th running, indicating a significant local history beyond a singular mountain challenge.