During his high school years he was a great Football player and up to this day is the most famous player in the city of Garrison. Despite this, his professional career as a football player consisted in failures after failures mostly due to his irresponsible actions like tackling the team mascot or drinking during the games which lead to Colt being eventually cut off of every team he made it into.
Initially, he has a complicated relationship with his father, where it is implied that the major conflict was established when Colt decided to leave the Ranch and follow his dream to become a professional football player.
As the series progresses, Colt starts getting along better with his father and brother. The family has faults but in the end, they all work it all out. Colt is shown to be slightly intelligent, because of him being in 5th grade for two years and of the math skills that made him the laughing jokes of Beau and Rooster.
Colt and Abby were high school sweethearts and were together for all four years. When Colt comes back home Abby has a boyfriend named Kenny. Both struggle for their feelings for each other for different reasons. But, they do get back together after a long wait. At the end of season 2 Colt goes to Abby preparing his marriage proposal, but does not propose after finding out his previous girlfriend Heather became pregnant after hooking up with Colt prior to his new relationship with Abby.