Lou takes three of her former New York co-workers on the Heartland Equine Retreat trail ride. She ropes in Jack, Amy and Tim to assist. Ty encounters Kit Bailey for the first time. Caleb introduces Kit to Ashley Stanton in order to set her up with a training partner and a horse, as she's taken up barrel racing. Val is terribly upset when she finds out, and decides that Ashley doesn't need her show-jumper, Apollo. Mallory takes Spartan out for a ride, and loses him momentarily. When he becomes ill later on, Ty realizes the horse must have eaten pesticide-sprayed grass. With the help of Kit and Caleb, he gets the remedy down Spartan's throat, saving the horse's life. Lou's friends depart after returning from the trail ride, having each learned a little something about themselves, and each other.

It's rodeo time and the Heartland crew is all involved. Amy decides to try team roping at the rodeo, with Caleb. When Tim's advice gives Caleb second thoughts, Ty is glad to help Amy practice, until Jack convinces Caleb to make good on his commitment and take her back. Meanwhile Lou pulls such a nutty while sponsoring Soroya for the Queen of the Rodeo contest that she loses her contestant. Ty's feeling left out but what a novice cowboy to do?

One night during a late summer heat wave Ty's dad shows up with a truck full of sick and thirsty horses bound for the slaughterhouse. As Scott and the hands at Heartland work to save the horses Lou calls the police but they can do nothing. When Amy recognizes one of the horses as Apollo, Ashley Stanton's old jumping horse, the mystery deepens. Lou looks into buying and rescuing the animals while Ashley confronts her mother and Ty warily spends some time with his disreputable father.

Mallory's dad's got a gold record and a new plan for Mallory... Boarding school. Meanwhile Amy's back in school as well leaving more of the chores to Jack, Caleb and Ty. Ashley's staying at Heartland, much to her mother's dismay, and has promoted herself to VP of guest relations. Ty is still trying to make amends with Amy for his latest relationship snafu, while Caleb likes the way things are working out. Lou's seeing more of Constable Mark because of a recent upsurge in cattle rustling.

Tim recuperates from his shooting injury at Heartland ranch, immediately trying the patience of Jack. Callie is upset when she finds out Tim has not told anybody about their relationship. Amy makes some surprising discoveries about Hank, an elderly ex-owner of a horse she's attempting to re-home. Ty convinces Amy to talk to Caleb, who's shunning his duties at the ranch, and holds himself responsible for what happened to Tim.

Lou's New York friend Mackenzie has asked Lou if she can have a simple wedding at heartland and Lou's in the process of getting everything arranged. Amy has started working with one of Lisa's horses, the animal is moody and is possibly cursed...

Amy and Caleb continue to battle over Ashley's staying at his place. Meanwhile Val may need Ashley but is unable to seal their rift. Ty is upset because his former probation officer brings a couple of troubled kids to the dude ranch. Peter continues to try and charm Lou.

Kit asks Ty to help her re-home a horse that she was given. Amy agrees to help Caleb with team roping but backs out when it means being around Kit and Ty more than she wants. Jack and Tim lock horns about their last competition in the Hudson Derby when Lou resurrects the event as a fund raiser to help Mrs. Bell and others with some county legal problems.

Spartan, that horse that Amy and her mom rescued, is stolen. When Spartan turns up at a horse auction and is bought by Wes, the man who tried to burn down the Fleming's barn, Amy is determined to get him back, despite not having the proper bill of sale. Meanwhile Lou tries to keep it quiet that she's dating the oilman, Peter.

When Spartan starts to refuse jumps, Amy takes him to a first nations horse trainer that used to work with her mom. Meanwhile Ty struggles to gentle Harley, his new horse, on his own. Peter books the entire dude ranch and while Lou is still trying to keep their relationship a secret, she learns something about Peter's past that throws her.

Ty is trying to make a decision about his future. His apprenticeship with Scott Cardinal takes him to the Bailey ranch where Kit's mare is about to deliver. The idea of Ty and Kit spending time together makes Amy a little jealous.

As the second anniversary of Marion's death approaches, Victor comes to the ranch to pay his respects. As Tim begins to suspect that Victor and Marion's relationship was more than he thought, Jack and the girls are caught in the middle. Ty asks Amy to work with Kit's horse who's temperamental after losing a foal. Peter asks Lou to accompany him on a business trip Paris.

Kit Bailey's barrel racing horse Daisy has not been performing well since losing her foal. Ty encourages Kit to bring Daisy to Heartland to be treated by Amy, causing friction among them. When Daisy turns out to have Strangles Heartland is placed under quarantine and Pegasus's health is threatened. Meanwhile Amy is also dealing with a demanding client who is having problems with her dressage horse.

After getting a clean bill of health from her doctor Val Stanton is eager to enjoy life. She renews her interest in show jumping and hires Amy to coach her. Mallory is jealous when it appears Jake has a new girlfriend.

When Caleb needs some cash for a down-payment on his trailer lot he enters a team roping event. Amy is upset when he asks Kit to be his roping partner. Meanwhile Badger is trying to interpret the mixed signals he's getting from Mallory about their relationship status. Tim considers selling Lightning Dexter, his race horse, rather than keeping it through its convalescence period.

Ty is trying to make a decision about his future. His apprenticeship with Scott Cardinal takes him to the Bailey ranch where Kit's mare is about to deliver. The idea of Ty and Kit spending time together makes Amy a little jealous.

Lou takes three of her former New York co-workers on the Heartland Equine Retreat trail ride. She ropes in Jack, Amy and Tim to assist. Ty encounters Kit Bailey for the first time. Caleb introduces Kit to Ashley Stanton in order to set her up with a training partner and a horse, as she's taken up barrel racing. Val is terribly upset when she finds out, and decides that Ashley doesn't need her show-jumper, Apollo. Mallory takes Spartan out for a ride, and loses him momentarily. When he becomes ill later on, Ty realizes the horse must have eaten pesticide-sprayed grass. With the help of Kit and Caleb, he gets the remedy down Spartan's throat, saving the horse's life. Lou's friends depart after returning from the trail ride, having each learned a little something about themselves, and each other.

When Caleb needs some cash for a down-payment on his trailer lot he enters a team roping event. Amy is upset when he asks Kit to be his roping partner. Meanwhile Badger is trying to interpret the mixed signals he's getting from Mallory about their relationship status. Tim considers selling Lightning Dexter, his race horse, rather than keeping it through its convalescence period.

It's rodeo time and the Heartland crew is all involved. Amy decides to try team roping at the rodeo, with Caleb. When Tim's advice gives Caleb second thoughts, Ty is glad to help Amy practice, until Jack convinces Caleb to make good on his commitment and take her back. Meanwhile Lou pulls such a nutty while sponsoring Soroya for the Queen of the Rodeo contest that she loses her contestant. Ty's feeling left out but what a novice cowboy to do?

One night during a late summer heat wave Ty's dad shows up with a truck full of sick and thirsty horses bound for the slaughterhouse. As Scott and the hands at Heartland work to save the horses Lou calls the police but they can do nothing. When Amy recognizes one of the horses as Apollo, Ashley Stanton's old jumping horse, the mystery deepens. Lou looks into buying and rescuing the animals while Ashley confronts her mother and Ty warily spends some time with his disreputable father.

Mallory's dad's got a gold record and a new plan for Mallory... Boarding school. Meanwhile Amy's back in school as well leaving more of the chores to Jack, Caleb and Ty. Ashley's staying at Heartland, much to her mother's dismay, and has promoted herself to VP of guest relations. Ty is still trying to make amends with Amy for his latest relationship snafu, while Caleb likes the way things are working out. Lou's seeing more of Constable Mark because of a recent upsurge in cattle rustling.

Tim recuperates from his shooting injury at Heartland ranch, immediately trying the patience of Jack. Callie is upset when she finds out Tim has not told anybody about their relationship. Amy makes some surprising discoveries about Hank, an elderly ex-owner of a horse she's attempting to re-home. Ty convinces Amy to talk to Caleb, who's shunning his duties at the ranch, and holds himself responsible for what happened to Tim.

Lou's New York friend Mackenzie has asked Lou if she can have a simple wedding at heartland and Lou's in the process of getting everything arranged. Amy has started working with one of Lisa's horses, the animal is moody and is possibly cursed...