Grayson is the 2019 Mountain Running World Champion and a 2-time US Mountain running champion. In 2022, she won the Nations Cup in Susa, Italy. On the track she is a 5-time All-American at the University of Utah and most recently finished 6th at the 2021 Olympic Trials in the 3000m Steeplechase.

Rachel is a national champion in the trail half marathon. She has represented Team USA 4 times in the trails and was part of the 2022 gold and bronze medal winning teams in the World Championship Vertical and Mountain races. On the track she is a 6- time All-American at Baylor University.