Tucson's Fastest 5K: Historically the Tucson 5000 is one of the fastest 5Ks in the West! This pancake-flat, fast USATF certified course provides the perfect opportunity for a 5K PR or run your first 5K on a course that is beginner friendly. This race has been a Tucson staple for over 20 years with 20+ of the current Arizona age records for the 5K being set at the Tucson 5000!