Jepchirchir set a new best of 66:39 minutes at the 2016 Ras Al Khaimah Half Marathon. Despite the fast time, which moved her to 13th on the all-time lists, the strength in depth of the race left her in fourth some way behind winner Cynthia Cherotich Limo while six women ran quicker than 67 minutes (a first for the sport). This performance earned her a place on the Kenyan team for the 2016 IAAF World Half Marathon Championships. The five-woman team led out the start of the race, with Ethiopia's Netsanet Gudeta and Genet Yalew also in contention. As the race progressed, this was whittled down to a Kenyan trio of Jepchirchir, Limo and Mary Wacera Ngugi, and this eventually resulted in a sprint finish between Limo and Jepchirchir. Despite having been among the least experienced and well-known of the Kenyan team, it was Jepchirchir who emerged as world champion, finishing the race in 67:31 minutes and leading the Kenyan women to the team title and a podium sweep with Limo and Ngugi.