Mosley redshirted during his first year as a Husker.
Trai Mosley joined the Nebraska program as one of five defensive back prospects in the Huskers' 2014 recruiting class. Mosley was also one of four Texans in Nebraska's 2014 class, the most of any state. The 5-10, 165-pound Mosley helped Hendrickson High School to a 10-1 record and trip to the Class 5A Division 2 state playoffs in 2013. Mosley was a ballhawk in the secondary and a dangerous threat in the return game for Coach Chip Killian's team as a senior, and his play earned Mosely second-team all-district honors. As a junior, Mosley helped Hendrickson High to an 8-3 record and a trip to the state playoffs. Mosley had 38 tackles, including two tackles for loss and added three interceptions and eight pass breakups. Mosley earned second-team all-district honors for his performance in 2012. Mosley was also a standout kick returner for Hendrickson during his prep career. Mosley only visited Nebraska, but also had offers from Baylor, Oklahoma, SMU and Texas State. Mosley was ranked as one of the top 60 cornerbacks in the country by Scout.com, while 247 Sports listed him among the top 105 players in the state of Texas. Mosley was born on Jan. 22, 1996, and is the son of Shonequa Wesley.