Hosted as a charity fundraiser for the Sisters of Life in Denver, the Nun Run Half Marathon, 10k, and 5k is entering its 9th year in support of reaching their annual goal of $31,000. Taking place within a beautiful regional park along a 71-mile stretch of canal from South Platte River to Waterton Canyon, the Nun Run Half Marathon enjoys serene natural landscapes throughout. Amidst the Rocky Mountains, this course is truly amazing, not to mention it takes place mid-September, so expect the colours of autumn to be in full bloom.