Folston attended Cocoa High School in Cocoa, Florida, where he was an AP Florida Class 4A first-team all-state selection in 2012. He was also named the Florida Today offensive player of the year following his senior season, in which he rushed for 1,186 yards and 13 touchdowns helping advance Cocoa to the Florida state semifinals. He was selected to play in the 2013 Under Armour All-America Game in St. Petersburg, Florida. Considered a consensus four-star recruit by Rivals.com, ESPN and Scout.com, he was rated as the 6th best running back prospect of his class. On January 2, 2013, he accepted a scholarship offer and committed to Notre Dame over offers from Florida State, Auburn and Oregon.
College career
Freshman
Folston played a limited role in the first half of the season due to depth at the position and a hip flexor injury before having a breakout performance against Navy. He rushed for 140 yards on 18 carries, scoring a touchdown in the last few minutes of the game helping his team to victory. He finished the season with 470 rushing yards on 88 carries, ranking third on the team in both categories, but tied for the team high with three rushing TDs.
Sophomore
Folston entered the season in a three-man rotation at running back with senior Cam McDaniel and fellow sophomore Greg Bryant. Through the first five games of the season, Folston managed only 165 yards before breaking out for three touchdowns and 169 total yards in a 50–43 victory over North Carolina. Following his performance, over the final seven games of the season, Folston earned the majority of the carries. He rushed for 100+ yards in four of the final seven games of the season; 120 against Florida State, 149 vs. Navy, 106 vs. Northwestern and 134 vs. Louisville, and concluded his season rushing for 73 yards and one touchdown against LSU in a 31–28 victory in the 2014 Music City Bowl. He finished his season with 889 rushing yards on 175 carries and six touchdowns, with 18 receptions for 190 yards and one touchdown receiving.
Junior
After his third carry of the season, against Texas, Folston left the game and did not return. The next day, Brian Kelly announced that Folston had torn his ACL and would miss the entire season.
Folston signed with the Tampa Bay Vipers of the XFL during training camp before its inaugural 2020 season. He was placed on injured reserve before the start of the season on January 21, 2020. He was waived from injured reserve on February 28, 2020. He was re-signed on March 6, 2020. He had his contract terminated when the league suspended operations on April 10, 2020.
