The fourth(ish) Annual Greenbrier River Trail Marathon and 2nd Annual Half-Marathon is a 26.2 mile and/or 13.1 mile footrace that brings runners from all over the country to compete and test their fortitude. The marathon starts in Cass at the sound of the train whistle, and then runs south on the Greenbrier River Trail State Park, ending at Stillwell Park, while the half-marathon will start and end at Stillwell Park running south toward Seebert and back.