Training Volume’s Effect on Ultrarunners Performance Ultrarunners compete at a distance of at least 50 kilometers, but most races are 50 miles, 100 miles, or 100km. The Western States 100 Mile Trail Race starting in Sqauw Valley ending in Auburn, CA has more than 18,000 ft. of vertical gain and 23,000 ft. of vertical loss, is known as the “super bowl” of ultrarunning. Success at ultra-distances is likely due to several factors such as, training distance, training volume, training vertical feet, and timing of training. Using publicly available data on the Strava platform we collected training statistics from the runners of the race from 131 of the 380 of total entrants. Only 73.4% of entrants completed the race. The average age of the runners was 39.8 years, while 79.7% of those runners were male and 20.3% female. We compiled runners’ yearly/monthly training volume and vertical and compared it to their ultra-running ranking, likelihood and time to finish at Western States using t-tests and correlation statistical analysis (single and multivariate). Our results will help determine how the amount and timing of training time, distance and vertical relates to success at the most prestigious ultramarathon in North America. Faculty Sponsor: Matt Laye