Anton Krupicka

Anton Krupicka, born 2 August 1983, is an American ultra-runner who has won the Leadville 100 twice, along with the Miwok 100K, the Rocky Raccoon 100 Miler, the Collegiate Peaks 50 Miler, the White River 50 Miler twice, the High Mountain 50k and the Estes Park Marathon. His 2010 White River time of 6:25:29 was a course record. He has set 28 Fastest Known Time running records, including the 28-mile Maroon Bells 4 Passes Loop in 2009, and in 2010 he came second in the Western States Endurance Run in what would have been a course record time of 15:13:53. A running career shaped by injuries led him to climbing, skiing and especially biking, and in September 2024 he placed second at the Grindstone 100 Miles, qualifying for the 2025 UTMB World Series final.