Amy and Lou Fleming, and their grandfather Jack, deal with life after their mother's death while a new ranch hand, Ty Borden, comes to live and work at Heartland.
Lou sends an uncured horse back to its owner, which causes friction with Amy. Ty builds Amy a jumping ring and Jack decides to keep Ty on at Heartland.
High profile horse breeder Lisa Stillman asks Amy to help her with her horse, Promise. Lou holds a Heartland Open House to help bring in business.
Ben Stillman arrives at Heartland and his treatment of his horse Red angers everyone. Ashley lures Ty to Briar Ridge with a job offer.
Lou decides to make a promotional video for Heartland. Ty's new job at Briar Ridge isn't going as planned. Scott gets Amy to help with a wild pony.
Lou's boyfriend Carl arrives at Heartland with a couple of different proposals for Lou. His welcome, however, is both hot and cold.
Lou isn't pleased when a neighbouring rancher brings a pregnant mare named Melody to stay at Heartland. Ty is astonished when Jack asks him to join him on a cattle roundup.
The pressure is on when a famous race horse, Gallant Prince, is sent to Heartland to see if it can be rehabilitated.
An old girlfriend of Ty's shows up at Heartland and stirs up trouble. Lou is reunited with Sugarfoot, Mrs. Bell's miniature horse.
Nick Harwell arrives to train Ben but becomes interested in buying Spartan. Mallory thinks Lou plans to re-home Copper and runs away with him, only to discover a plot to sell wild mustangs.
Tim's visit to Heartland causes sibling rivalry between Lou and Amy. Jack takes Lisa Stillman fishing on their second date.
Scott invites Lou to a black tie dinner on the same night as the local high school's semi-formal. Ty accompanies Amy to the local dance leaving Jack home alone to mind the ranch. When an arsonist strikes, Jack is injured and can't recall exactly what happened. Will his memory recover in time to identify the culprit?
Amy finds herself working with the enemy when Ashley asks for her help. Amy's also preparing Spartan for the Fall Finale while Lou decides what to do about a job offer in New York.