Lou comes back from Dubai to spend time with the family. Ty and Amy discover where her father's rustled cattle are being pastured and the whole family rides out to bring them back.
Amy is hired to teach a class of convicts about horse training as part of their work program. Ty is surprised when one of the cons turns out to be an old friend.
Caleb needs some cash for a down payment on his trailer lot, so he enters a team roping event, but Amy is upset when he asks Kit to be his roping partner.
When Tim decides not to enter his horse in the big race, his girlfriend Janice agrees to ride for a competitor. Badger discovers the car he bought is stolen and must get rid of it.
Peter returns from Dubai to find out what's going on with Lou. Amy and Ty convince Sarah, the town hermit, to let them treat her sick horse at Heartland.
As graduation looms, change comes to Heartland. Amy is offered a full scholarship from an equine program at a university in Colorado. To Mallory's chagrin, Badger comes to work as a hand at the ranch.
Caleb pushes everyone away as he struggles to deal with his accident. Mallory is interested in joining her school riding club and gets a little help from Amy and Caleb.
Amy faces a tough moral dilemma when she discovers Mr. Hanley has abandoned his horses and is on the brink of losing his farm.
Amy and Ty are at odds over his purchase of a vintage motorcycle while Caleb goes off to a rodeo in Montana despite Ashley's growing concerns about his life on the circuit.
When a dangerous horse infection called 'strangles' puts Heartland under quarantine, relationships are put to the test and Pegasus becomes very ill.
Victor Whitetail makes a surprise visit to Heartland, which stirs up the past and leaves Tim wondering if Victor was more than just friends with his ex-wife.
While the boys head off on a fishing trip, the girls are left back at Heartland to deal with the havoc caused by a dog, a porcupine and a herd of escaped cows.
Amy leads a rescue search to find Ty and Scott. With Scott near death, Ty must help him survive.
Amy is upset when Ty flies off with Scott to a remote veterinarian call on his last day before heading to school.
Jack's truck is on its way to rust bucket heaven, forcing him to find the courage to say goodbye to a part of his past.
Business is booming at Heartland. Amy finds herself caught in the middle of a family crisis when she tries to help a girl and her horse recover from what appears to be a freak accident.
An accident on the highway involving a school bus and a trailer full of horses leads to sudden fame for Amy and a surge of business at Heartland.
Ty and Amy make a trip up to the mountains. But when Ty passes out with a high fever and a blizzard approaches, their remote location is a problem.
After a traumatized Spartan refuses to jump, Amy takes him to a man who fixes horses and hearts. Meanwhile, Ty struggles to tame his new horse, Harley, on his own.
Spartan is stolen and turns up at a horse auction. He is bought by Wes, the man who tried to burn down the Fleming's barn. Amy is determined to get Spartan back.