Ty is especially angry, challenging Amy to prove that Heartland is different than the other stables like Briar Ridge that tolerate this treatment of horses. Lou is apprehensive of revealing to her family that she is dating an oil guy, and goes to extreme measures to avoid them seeing her with Peter. Tim and Lisa clash over the price for the dude ranch. The whole family is sleep deprived from the new baby. This turns out to be a lie when Lou sees him kissing a blonde in Hudson, in his truck. Amy is working on desensitizing a horse named Acorn to noise and struggles to make progress with the oil company blasting at the edge of Jack's land. At the end of the trip, Lou feels bad for the fight that happened among the girls the previous night and tries to apologize, but the girls say it was therapeutic, and they will be sure to spread the word in New York about the Heartland Equestrian Connection.
Peter is forced to tell Lou he has an ex-wife when he has to take care of their dog, Max. She also learns that you can't always believe what you read online. Mallory discovers that the two fishermen staying at the dude ranch are actually working for the oil company, when she is cleaning their cabin and discovers their fishing gear left behind. Tim refuses Jack's offer to help with the rodeo school but is forced to swallow his pride and accept the offer. Reeling from her recent discovery, Georgie pulls away from Amy and focuses on donating money to an online animal sanctuary. When Jeff reveals he wants to raise Georgie, the family is faced with the possibility of losing her.
Tim becomes a source of tension in the household, constantly ringing a bell and expecting to be served. Eric Williams who has bought the farm where Phoenix used to live and its livestock sees his natural potential as a jumper. Lisa also meddles in Lou's personal life, giving her email to a friend, who passed it on to another friend's single son. Ty assists Scott with the delivery, which is complicated by the fact that the foal is upside down. Ty and Badger fight from the beginning, when he refuses to put out his cigarette and later lets all of the horses in the barn out. Val, not wanting to be seen beginning to jump again obtains use of an indoor arena for her lessons. In the process, she confronts her own unresolved feelings about her mother's accident.
Miranda kisses Tim and decides to let Shane visit him anytime he wants. Caleb returns and so does Nicole, Lou's friend. Tim shares a misunderstanding with Jack through a lack of communication. In the meantime, Georgie wrestles with a decision that could take her away from her family, and Jack and Lisa reconnect after their time apart. Kit says she knew he could do it, though he struggled with Grade 12 Algebra. Mallory takes steps to ensure that her favourite horse Copper won't be sold by Lou, discovering in the process that an unscrupulous ranch hand named Wes has plans to sell a herd of wild mustangs to a slaughterhouse. Once that problem's solved, Ty decides to help Badger by coaching him through how to apologize to Clint, which Badger does.
Ty finally tells Amy his feelings for her. The next day, Ty and Kit are having fun while working on schoolwork in the back of his truck, and they kiss. Meanwhile, a leaky roof causes Ty to make a big decision that he thinks will help them grow as a couple by moving into Ashley and Caleb's trailer. Stuart then decides to sue Heartland for negligence. Both sign up for this derby to settle their score. She discovers that a horse named Spartan is being abused at Mallen's farm and convinces her mother, Marion, to rescue him. Ashley and Caleb become roommates, as Ashley leaves Briar Ridge again after fighting with her mother.
They are not legally married. Lou and Peter form a united front against trumped-up child endangerment charges. Then, when Amy helps Caleb source a horse for Tim's rodeo school, she learns just how precarious Caleb's business partnership is with Jesse. Lisa buys a digital picture frame with all of her and Jack's pictures from France. They haggle over price, and Jack plans to take the hay. Mrs Bell and Sugarfoot are run off the road by Chase and Ty comes to their aid.
Amy is angry that he spent the money he'd been saving for a motorcycle on a horse, but he says that he's almost a motorcycle, due to the name. Peter has problems of his own as he tries to conduct his company's business from Heartland. Jack wants to buy out Tim, and their cattle are fine. Amy steps in to help Georgie with the course. Peter comes home to spend time with the girls and Lou reveals her new business venture with Maggie's to him.
Later, Val is driving along, and pulls over to answer her phone and discover that she needs further tests. Bell from her beloved pony Sugarfoot, Lou revives the Hudson Charity Derby to raise money for a legal defense fund. Lou starts stressing about how Peter and the rest of the family won't make it back in time for Christmas, while she is stuck looking after Christmas-obsessed-Mallory. Amy and Caleb compete in and he also competes in , earning him the buckle at the rodeo. For no clear reason, Spartan is acting a bit uneasy. Kramer also helps Amy with Duke, because the two horses become fast friends.
All of the polo horses get sick, so it is up to Ty and Scott to find the problem. Amy and Ty head out to their dance, but Ty's truck breaks down. Lou returns home from Dubai, in no mood to answer questions about her marriage or why she isn't with her husband. Mitch makes a tough decision about his relationship with Lou. Callie and Tim get in a fight, but get back together, and she takes him back to Big River, and finally out of Jack's hair.
Ty is eventually fired when Val discovers he has a record. Scott wins the race and Tim and Jack tie for second although Tim's horse was ahead by a little bit, if you watch closely. Ashley mopes around because Caleb hasn't spoken to her since leaving for the rodeo circuit. With the house being overcrowded, Jack builds an outhouse to accommodate. Amy and Ty try to help him settle in while they work on rehoming him, by bringing Hank Adams to visit his horse.