He played college football at Georgia and was selected by the Browns in the second round of the 2018 NFL draft.

[2] As a standout track & field athlete, Chubb competed from 2011 to 2015 in events ranging from the 100-meters to the shot put.

[4] He captured the state title in the shot put at the 2014 Class AAAA with a throw of 16.77 meters (55 ft).

[6][7] In June 2013, he committed to the University of Georgia to play college football under head coach Mark Richt.

[8] Chubb entered his true freshman season as a backup to starter and future NFL running back Todd Gurley.

[16] Chubb finished his freshman season with 1,547 rushing yards, good for second in the SEC, despite starting just eight games.

[18] However, on October 10, 2015, Chubb suffered a "grotesque" knee injury against Tennessee,[19] preventing him from surpassing the record.

[21] Chubb returned in the Chick-fil-A Kickoff Game, rushing for 222 yards and two touchdowns in a victory over #22 North Carolina.

[19] After two modest performances in narrow victories, Chubb sprained his ankle against Ole Miss and was used sparingly over the next five games.

[23] Chubb also passed Kevin Faulk and Darren McFadden to become second in all-time SEC rushing yards, trailing only fellow bulldog Herschel Walker—who was voted the greatest college football player of all time by FBS coaches[24]—in this category.

It was thought that Chubb would enter the 2017 NFL draft, but he decided to return in 2017 for his senior season with the Bulldogs.

In a double-overtime victory over Oklahoma in the Rose Bowl in the College Football Playoff semifinal, Chubb had 145 yards on 14 carries, including a 50-yard touchdown just after halftime and a game-tying 2-yard run in the last minute of regulation.

[29]) In the national championship game, Alabama's suffocating defense held Chubb to just 25 yards on 18 carries in the 26–23 overtime loss.

[35] Playing behind veterans Carlos Hyde and Duke Johnson, he made his NFL debut in a season-opening 21–21 tie with the Pittsburgh Steelers where he had three carries for 21 yards.

[38] On October 19, after the Browns traded Carlos Hyde to the Jacksonville Jaguars, Chubb was named the full-time starter.

[48] Chubb's 92 rushing yards against the Steelers in Week 11 were enough to move him past Christian McCaffrey for the league lead.

[55] During Week 3 against the Washington Football Team, Chubb finished with 108 rushing yards and two touchdowns as the Browns won 34–20.

[89] Following the game, head coach Kevin Stefanski announced that Chubb would miss the remainder of the season.

[95] On October 20, Chubb made his season debut at home against the Bengals and scored a rushing touchdown in his first game in 398 days.

[97] In Week 15's 21–7 loss against the Kansas City Chiefs, Chubb exited the game with a broken foot in the third quarter, ending his season.

[98][99][100] Chubb is named for his great-grandfather, descended from one of eight brothers who founded Chubbtown, Georgia, a settlement of free blacks, in Floyd County, which endured through the American Civil War.

[101] His older brothers Henry and Zach played cornerback for Troy University and defensive back for Air Force, respectively.