 Welcome to the 10th Annual Limestone Capital Half Marathon. Did you know the Limestone Capital Half Marathon isn't just, well, a marathon? The 5K course is great for families, friendly competition, and perfect for anyone who wants to get up and get moving. Registration is now open. Online registration and course maps are available at runsignup.com. Click on Find a Race and search Limestone, runsignup.com. Runners, take your mark.