Chepngetich won two gold medals in the 2000 mm steeplechase in the 2014, taking the title at the 2014 African Youth Games before winning at the 2014 Summer Youth Olympics (holding off Ethiopia's Zewdenesh Mamo both times). She held the world's four fastest times for the event that year. In the junior ranks she won the Kenyan junior title then moved into the top twenty of all-time for the 3000 m steeplechase with a run of 9:40.28 minutes to claim the silver medal at the 2014 World Junior Championships in Athletics, where she was only behind Ruth Jebet.