Horse racing was a fixture of the Treasure Valley for decades, but the sound of hooves on turf hasn’t been heard at the track since 2015. ... The future of Les Bois Park is something Ada County Commissioners are wrestling with. The property is part of some 240 acres that includes Expo Idaho, the Western Idaho Fairgrounds and Hawks Stadium. Ada County Commissioner Kendra Kenyon tells KTVB it’s unlikely horse racing will return to the track.