2020 race moved from May 3 to Sept 27. The Eau Claire Marathon is a USATF certified, Boston Marathon qualifying race. Since 2014, over 250 Eau Claire Marathon runners have qualified for the Boston Marathon. All races start and finish in Carson Park, a 134 acre peninsula surrounded by Half Moon Lake. As you exit the park, you will cross the first of 11 bridges. Making your way through our city, you'll enjoy the beauty and tranquility of both the Eau Claire and Chippewa Rivers as well as our many parks.