[1] Garneau began running at age eleven in her hometown of Vernon, British Columbia.
She ran several marathons before running her first ultramarathon in 2004 by competing in the Canadian Death Race.
[4] The next year Garneau won the Western States Endurance Run in a time of 19 hours, 1 minute, and 55 seconds after coming from behind at the 80 mile mark.
[5][6] She qualified for the Western States by winning the American River 50-mile Endurance Run.
She often cross trains by snowshoeing in sub-zero temperatures and practicing yoga.