Season Five of Heartland finds Amy reaching a new level of horsemanship that sets her down a freeing path. Ty realises that in order to move forward with his life and his relationship with Amy, he has to make some tough decisions. Lou grapples with the realities of motherhood and the possibility of going back into the workforce when money becomes tight. Tim seeks out his long lost son to establish a relationship and must figure out a way to tell his daughters they have a brother. And Jack remains the rock of Heartland, gently (and sometimes not so gently) helping his family deal with the ups and downs they experience in their lives.
Tim is having no luck tracking down Miranda and Shane since she dropped the bombshell that Shane is his son... until Shane --on his own-- surprises everyone by just showing up at Heartland. And Mallory entertains the idea of going with the recently-single-again Jake to the Spring Fling. There is however --as you might expect with Mallory-- a "but" attached.
When Tim is coerced to go with Jack on a secret mission Amy is left back at Heartland with Janice to get a young race horse ready for his maiden run meanwhile Ty has planned Amy a dinner but there has been an animal hiding in the trailer so they make a slight change of arrangements.
When Tim reveals to the family that Shane is his son it throws everybody for a loop and threatens to ruin the traditional Bartlett-Fleming-Morris naming ceremony for Lou's baby girl.
When Amy works with a chuck wagon horse she discovers an impediment that could put the entire team in danger and change the dynamics of a prominent chuck wagon family.
Amy helps to restore the confidence of a troubled, young trick-rider so that she can get back on her horse and perform again.
A friend from Jack's past shows up at Heartland when one of their old band mates passes away. Lou & Lisa secretly try to gather the other remaining members for a reunion performance to celebrate Jack's birthday.
When Shane arrives to stay for the summer, Tim tries to impress all three of his kids with a really cool Western day trip.
When Ty visits Mrs. Bell to thank her for paying his school fees he and Amy are surprised to learn she’s moved out of her home, and away from Sugarfoot.
When Tim's young racehorse Cisco is stolen on the way to his maiden race, Amy and Ty get help tracking him down from an unlikely source – Ty's step-father, Wade.
When Amy bravely tries to heal an abused (and now extremely violent) racehorse Ty and Jack think she's finally bitten off more than she can chew.
Ty's mother Lily returns to Heartland with shocking news about his father, and a secret that threatens her relationship with her son.
When Jack learns Ty is riding his bike solo to a remote lake to spread his father's ashes he decides to surprise Ty and join him for this meaningful road trip.
In an attempt to avoid hitting a wolf, Ty is badly injured when he crashes his bike on a remote road, leaving Jack to search for help in the middle of nowhere.
Amy is roped into helping Tim project a positive image to the community, in hopes it will further his custody case for Shane.
When tragedy strikes Amy must find a way to save Mr. Hanley's rescue horses from kill buyers.
Amy and Ty join Scott on a trip back to his old reservation to save a herd of wild horses from the dangerous EHV-1 virus.
Amy's dog is injured by a rancher, and it's up to Ty to save his life
When a mystery horse arrives at Heartland, Amy and Ty are sent down a path that will alter their lives.