While a dangerous bear lurks near Heartland, Amy and Georgie rescue an injured horse from the woods.
Ty prepares to celebrate an important milestone as he and Amy treat an abandoned horse.
After enlisting Amy to help her perfect a trick to perform at an upcoming rodeo, Georgie gets pulled away by Lou and Peter who insist she focus on her schoolwork.
Jack grapples with the impending loss of a loyal and trusted friend. And in a desperate bid to relieve Paint's arthritis and extend his life, Ty focuses on medical treatments while Amy uses every herbal and physical therapy she's learned. Meanwhile, Georgie deals with her new math tutor, a brilliant but arrogant boy from her school.
As Amy and Georgie prepare to compete in a cowboy competition, Georgie guilts Jack into helping her train on a new horse in the hopes he will fall in love with the animal.
Ty and Amy's attempt to rescue an injured eagle in the mountains takes a dangerous turn. Georgie is thrilled to be volunteering at the Reserve for extra credit, until she is forced to pair up with her arrogant math tutor. Finding it difficult to juggle the demands on her time, Lou comes into conflict with Lisa over her busy schedule.
Amy helps a Medieval jouster who was badly injured during a competition regain his confidence so he can compete again. When Georgie aces her written driving test, Tim steps up to give her driving lessons. Meanwhile, Ty and Amy consider breaking up with Caleb and Cass after a disastrous double date. And Lou stresses over Katie's first day of kindergarten and her daughter's decision to "marry" a little kindergarten friend that soon leads to a "divorce.
Amy's attempts to help Georgie deal with an impending departure are complicated by Olivia.
Amy and Ty work together to determine why Caleb's horse becomes ill during his treatment at Heartland. Meanwhile, Georgie pits her parents against each other to get permission to go on an "away" trip with some girls from the Extreme Team. And while Jack and Tim work together to bring the loft up to code as ordered by the insurance inspector, they discover unexpected interlopers.
Georgie begins to second-guess her decision to run away from Heartland, while the family bands together to find her. Meanwhile, Amy and Ty work frantically to save Georgie's horse Phoenix from pesticide poisoning. And Jack, Tim and Caleb team up to trace the pesticide's origins.
Ty gets roped into helping Jack and Tim on a cattle drive but an unforeseen accident jeopardizes their plans. Meanwhile, Georgie must work with an unlikely ally to find a way out of a corn maze. And a girls' night in turns sour when Amy dispenses unwanted relationship advice to Lou.
Tim seeks Amy and Georgie's help to discourage Jade from accepting a shady sponsorship deal. And when one of Georgie's trick riding horses can't perform, Amy works with Cass to treat him using acupuncture. Meanwhile, the world of online dating brings out Lou's worst analytical side.
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.