The junior cyclocross and mountain bike world champion finished the race 50 seconds ahead of Clara Honsinger (USA) and 1:27 ahead of Katie Clouse (USA).
Honsinger had won the previous day's UCI elite women's race, beating Holmgren by about half a minute, but the tables had turned for the championships event held in Missoula on Sunday.
Clouse, along with Sidney McGill, had the fastest opening lap times, followed by Honsinger and Holmgren.
However, by the sixth and final lap, Holmgren had increased her lead to nearly a minute, forcing Honsinger to settle for second and Clouse third.
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Kirsten Frattini is the Deputy Editor of Cyclingnews, overseeing the global racing content plan.
Kirsten has a background in Kinesiology and Health Science. She has been involved in cycling from the community and grassroots level to professional cycling's biggest races, reporting on the WorldTour, Spring Classics, Tours de France, World Championships and Olympic Games.
She began her sports journalism career with Cyclingnews as a North American Correspondent in 2006. In 2018, Kirsten became Women's Editor – overseeing the content strategy, race coverage and growth of women's professional cycling – before becoming Deputy Editor in 2023.
