Hörnli Trail 1133 is a mountain run in eastern Switzerland. It begins at Kloster Fischingen at 11:33 and ascends to the Hörnli, reaching an altitude of 1,133 metres. The primary race covers 11.33 km, with the distance, start time, and summit altitude reflecting the event's name.
The course largely follows trails and crosses three cantons. It goes over the Groot, Thurgau's highest point at 996 metres, before concluding on the Hörnli. Participants can also compete in the Klostersprint, a mountain prize segment, and a downhill section. A separate Kidsrun is held around the monastery for children.