Competing at her first Olympic Games at the age of 24, Janet Achola earned qualification into the Games by posting a time of 4 minutes, 5.52 seconds, at the 2012 Fanny Blankers-Koen Games on 30 May, which was 0.48 seconds quicker than the "A" qualifying standard forwomen's 1500 metres. She said the training that she received from coach allowed her to achieve success and set herself the objective of securing her first medal at an international event. Overall she finished 22nd out of 44 competitors, and was 3.81 seconds slower than the two slowest athletes who progressed to the semi-finals and, therefore, that was the end of her competition.