Amy and Cassandra work together to save a racehorse with a career-ending condition, while the arrival of a former girlfriend - Janice - forces Tim to see his current relationship with Casey in a new light. Meanwhile, Georgie does a favour for Olivia and it completely backfires, threatening Adam's campaign for class president.
Georgie's school project on Val Stanton inspires her to take a risk with Adam. Meanwhile, a shocking announcement from Caleb makes Ty question why Amy hasn't told him some important news. And Jack hires new help for Heartland after a close call puts several horses in danger.
When Lou returns from New York she is forced to confront two interlopers: Heartland's new ranch hand, and a trendy food truck that is threatening Maggie's business. Meanwhile, Amy struggles to help a challenging client regain her confidence. Then, after Georgie insists that she and Adam are nothing more than "friends," she is devastated when she sees him at a party with another girl. And Tim makes a difficult decision about his future.
Lou finds herself trapped at the Dude Ranch with Mitch, the new ranch hand, and they both reveal the circumstances of their recent pasts. While helping Amy treat a client horse, Ty feels conflicted about opening a mysterious package that has ties to his troubled past. And Jack and Lisa cope with a health scare, while Georgie and Adam deal with the fallout from Adam's kiss with another girl.
While trying to help Cass learn to handle a spirited horse, Amy discovers there is more riding on their success than she initially realized. Meanwhile, Tim insists the entire Heartland family attend a Hudson holiday party where Lou is forced to deal with a series of unexpected events, not the least of which is Peter's sudden appearance. When tragedy strikes at the Wildlife Reserve, Georgie risks her life to save a herd of miniature horses and Ty steps in to offer support when Bob's dream of expanding the Reserve goes up in smoke. Meanwhile, when Remi destroys his new fly- fishing bait supplies, Jack holds onto his grudge against the dog in order to win a bet with Lisa.
When their plans to get away are thwarted, Amy and Ty celebrate their first anniversary closer to home and Amy unveils a special surprise. Meanwhile, Peter lobbies for a reunion forcing Lou to make a difficult decision about her and her family's future. While her parents grapple with their decision, Georgie has to act quickly on a trail ride when she learns a secret about Adam that leaves his life hanging in the balance. And Ty steps up to convince the devastated Bob to reconsider when he decides to throw in the towel at the Wildlife Reserve.
As Amy and Ty prepare for parenthood, they work together to resolve a dangerous pregnancy issue. Meanwhile, Georgie may be forced to give up something she loves when a demanding new Extreme Team coach arrives on the scene. Then, Lou has to decide whether she should tackle a new business venture that may take her away from the Heartland family. When Jack and Mitch work together with the herd, Tim is not ready to be pushed aside. And Georgie and Adam find the perfect way to celebrate an anniversary.
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