Tue
26
May
IKK BB Firmenlauf Potsdam
Potsdam, DE
Wed
27
May
B2Run Hannover
Hannover, DE
Wed
27
May
Seligenstädter Marathontaffel
Seligenstadt, DE
Wed
27
May
Steglitzer Volkslauf
Berlin, DE
Wed
27
May
30. Steglitzer Volkslauf
Berlin-Lichterfelde, DE
Wed
27
May
AOK-Firmenlauf Bielefeld
Bielefeld, DE
Thu
28
May
dm Firmenlauf Bad Kreuznach
Bad Kreuznach, DE
Thu
28
May
Kölner Leselauf
Köln, DE
Thu
28
May
AOK-Firmenlauf Oer-Erkenschwick
Oer-Erkenschwick, DE
Thu
28
May
Vatertagslauf für Jedermann
Rhaunen, DE
Fri
29
May
37. Lauf Rund um Burg
Burg, DE
Fri
29
May
38. Raesfelder Mai-Lauf
Raesfeld, DE
Fri
29
May
41. Michelstädter Stadtlauf
Michelstadt, DE
Fri
29
May
Nacht von Hasbergen
Hasbergen, DE
Fri
29
May
Sommerabendlauf am Auensee
Leipzig, DE
Fri
29
May
Stundenlaufserie Falkenstein
Falkenstein, DE
Fri
29
May
VfL Ahaus Stadtfestlauf
Ahaus, DE
Fri
29
May
26. Volksbank-Lauf "Rund um den Offlumer See"
Neuenkirchen, DE
Fri
29
May
42. Abendlauf Wilstedt bei Nacht
Wilstedt, DE
Fri
29
May
Bentfelder Abendlauf
Delbrück, DE
6. O-SEE Backyard Ultra
Saturday, July 11, 2026 · Zittau, Germany
About this race
O-SEE Backyard Ultra takes place in July in Upper Lusatia, centered at Westpark in Zittau and the O-SEE area by Lake Olbersdorf. It began as a local event called LAUFHAUS and is now part of the O-SEE events, which include the O-SEE Challenge and O-SEE Open Water Race. The format is straightforward and demanding: runners complete loop after loop until they cannot continue. The winner is the last athlete able to start the next loop.
The race has expanded rapidly since its introduction in 2020, attracting participants from across Europe and various nations. The event record is held by Latvian runner Ritvars Kalnins, a three-time winner, who completed 49 loops (approximately 328 km) over 49 hours. A children's race near Pethauer Teich offers a unique challenge: kids run five 1 km laps, starting together every 10 minutes. The winner is determined not by speed, but by the smallest difference between their fastest and slowest laps.
Start location
Zittau