 Yomif akavhura mwaka wake wa2015 paAfrican Junior ChampionshipsmuAddis Ababa, achikunda mumakwikwi emamita 5 000 nenguva dza14: 31.03. Akaita IAAF Diamond League kutanga kwake muDoha, achiisa wechishanu mu3000 m; akazokunda mujaho we5000 m muPrefontaine Classic muEugene, achivandudza zvaaive nazvo kusvika pa13: 10.54 uye achipfuura Edwin Soi naGalen Rupp. Yomif akawana kukunda kwake kwekutanga kweDiamond League vhiki rakatevera kuGolden Gala muRome, achikunda mumutambo wepasi rose we12: 58.39 uye achiputsa maminetsi gumi nematatu kekutanga. Musi wa 11 Gunyana 2015 Kejelcha akakwikwidza mumutambo weDiamond League muBrussels uye akaisa nguva nyowani uye nguva inotungamira yepasi rose ya2015 ye12: 53.98 mumutambo wemamita zviuru zvishanu. 