Agnes Jebet Tirop was born in Nandi, Chesumei in Central Rift region, Kenya.
She is the daughter of Proud Parents, Vincent Tirop and Dina Tirop.
Jebet participated and won The Baringo Half Marathon race, one that earned her a one-year training stint in Ethiopia besides taking part in the Ethiopian Great Run Championships and other international championships, according to the race patron and founder Paul Tergat. Jebet has never looked back and strives to win more athletics competitions.
In 2012, Jebet led Kenyans in the 14th IAAF World Junior Championships to win a Bronze medal in a time of 15:36.74 after Buze Diriba and Ruti Aga both of Ethiopia, this was at The Olympic Stadium in Barcelona.
2013 was an adventurous year for Jebet as she was in her international competitions. She won a Bronze Medal in a 3000m Kenya trio sweep with a 8:39.13 time, her personal best, after her compatriots Sylvia Jebiwott Kibet, Silver medalist and Mercy Cherono, Gold medalist in the IAAF World Challenge Meeting In Rieti in the same year. Jebet participated in the IAAF World Cross Country in Bydgoszcz, 2013, running closely with Compatriot Faith Kipyegon, she managed 2nd position in a time of 17:51.
2014 proved to be an amazing year for Jebet. She competed in the IAAF Permit/ KCB/ Athletics Kenya National Cross country meeting in Nairobi where she was 3rd in 19:21 time. She qualified for the Africa Cross Country Championships that was held in Uganda, She together with other athletes, Faith Kipyegon included, represented and did Kenya proud in the event, She won a gold medal in a rather good time; 18:51. She ran in the National Junior Championships that got her qualified for IAAF World Junior Championships held in July at Eugene, Oregon. She won Bronze in 5000m at a time of 15:43.12.