"The setting a new women's 50-mile world record with a time of 5:18:57. Tunnel Hill 50 Mile, held in Vienna, Illinois, continues to be a race where world records fall, and on November 8, 2025, it was Anne Flower Courtney Olsen held the previous record that she set when she ran 5:31:56 at Tunnel Hill just last year . Olsen raced the 100k event this year and received a mid-race 50-mile split of 5:33:59 as the second woman for the distance."
"Flower, an emergency room doctor based out of Colorado Springs, Colorado, made headlines earlier this summer when she beat Anne Trason's 31-year-old record at the 2025 Leadville 100 Mile at her first attempt at 100 miles. Before turning to trails in 2019, Flower had a history in marathons and competed in the 2020 U.S. Olympic Marathon Trials. In recent years, her focus has shifted more to trails."
"The Tunnel Hill 50 Mile is held on the Tunnel Hill State Trail, and the course sends racers on a double out-and-back on a flat course mostly made of a crushed gravel surface. The race gets its name from the tunnel racers pass through on the rails-to-trails trail. This is the third world record set on the course since 2023, when Charlie Lawrence set a new men's 50-mile world rec"
Anne Flower set a new women's 50-mile world record with a time of 5:18:57 at Tunnel Hill, running the 80.47 km course at an average pace of 6:23 per mile (3:57 per kilometer). Flower received a mid-race 50-mile split of 5:33:59 while racing the 100k and had previously held the 50-mile record at 5:31:56. Flower transitioned from marathons to trails after 2019, won notable ultras including Silver Rush 50 and Javelina 100k, and broke a 31-year Leadville 100 record earlier in 2025.
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