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.
A conning, former girlfriend from Ty's troubled past comes to Heartland at the same time Ty's probation officer is set to visit. Meanwhile, Mrs. Bell suffers a heart attack, which forces Amy and Lou to temporarily look after her pony, Sugarfoot.
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.
Val Stanton offers to purchase some of Heartland's acreage, an offer that becomes more appealing after the Heartland barn is burned down and Jack is seriously injured in the blaze.
Amy prepares to compete against Ashley in the Fall Finale with Ty coaching her, a partnership that brings Amy and Ty closer together. However, Amy is at risk of losing Spartan when his former owner appears at the event.