Hart spent one season at Colorado State after enrolling at Alabama as a five-star prospect out of high school. Hart redshirted his first season with the Crimson Tide after tearing his ACL, then suffered another significant knee injury in 2012.
Hart was eligible immediately at Colorado State this season as a graduate transfer. Hart rushed for a team-high 1,275 yards and 16 touchdowns and was named second-team All-Mountain West.
I'm going to declare for the draft," Hart said, according to the paper. "It was just a dream I always had growing up, and it's an opportunity I have this season, so I want to take advantage of it."
This is the second consecutive year the Rams are losing their leading rusher to the NFL; Kapri Bibbs declared for the draft after last season.
Colorado State finished 10-3.