After Heather drops a bombshell, a visit from Abby's parents is the last thing Colt needs -- and they all end up at church together on Christmas Eve.

Heather makes a decision about the pregnancy. Mary reads Rooster the riot act for keeping it a secret, and Colt struggles with how to tell Abby.

After a heart-to-heart with Maggie, Colt steps up and supports Heather. Meanwhile, the tension between Rooster and Beau takes a toll on Maggie.

Abby agrees to give Colt a chance, but her father isn't as forgiving. Beau and Rooster go to a cattle auction. Maggie thinks about selling the bar.

The guys wind up in hot water after an ice fishing trip. Beau takes Brenda out to dinner, but Maggie's not far from his mind.

Emotions run high when Abby and Heather fight, leaving Colt caught in the middle. Rooster faces the consequences of blowing off work.

During a snowstorm, Colt and Abby head out of town, Beau and Joanne get cozy at the ranch, and Maggie meets a charming stranger.

Colt gets possessive when Heather starts dating a teacher. Abby gives Beau relationship advice. Maggie has a business proposition for Rooster

As Heather's medical bills roll in, Colt realizes how expensive it is having a baby. A surprise visitor at the bar sweeps Maggie off her feet.

Colt's new responsibilities keep him away from Abby. After a memorable night, Maggie ponders what she wants for her future.

Colt wants to buy Sam Peterson's ranch -- with or without his family's blessing. Colt and Heather have a heart-to-heart about their loss.

Wondering if he's ready to marry Abby, Colt seeks romantic advice from an unlikely source: Beau. Rooster hires a flaky new waitress.

Beau ponders a lucrative business offer. Rooster runs afoul of the liquor board. Colt tries to make peace with Abby's dad.

Colt and Abby start planning their wedding, but they don't see eye to eye. Joanne confesses she still has feelings for Beau.

Abby moves in with Colt and Beau when she learns she’s losing her job. Rooster and Jen the engineer bond over getting dumped.

Back in town, Maggie frets about how Rooster's been running the bar. Abby considers a career change.

A job opportunity in Denver threatens to drive a wedge between Colt and Abby. Maggie pushes back about the pipeline.

Maggie takes a stand that lands her in hot water. Colt and Rooster come up with a plan to buy the Peterson ranch, but they need Beau's buy-in.

Beau shrugs off the doctor's orders and resists the family's efforts to help him. Meanwhile, Colt lashes out at Maggie.

Beau leaves the boys hanging about the Peterson ranch. Rooster takes Jen on a date. Colt and Abby fight about their future.

In the wake of his heart attack, Beau vows to stop sweating the small stuff -- but Colt and Rooster's latest blunder makes him lose his cool.

Maggie fights to keep the ranch afloat as she reaches a breaking point with the boys. Easter dinner with Abby's parents takes a surprising turn.

Torn between the ranch and a job opportunity, Colt wonders what's best for his family's future. Mary offers to work at Maggie's bar.

Four months later, wildfires rage in Colorado. Abby wants to postpone the wedding, but her parents don't approve. Joanne stands up to a stubborn Beau.

Fires force the town to evacuate. While Maggie takes charge, Beau feels hopeless. Colt runs into Heather, and Rooster meets Mary's boyfriend, Nick.

Colt and Mr. Phillips search for Abby. Heather warns Rooster about Nick. An unexpected celebration brings everyone together.

The Bennetts return to the ranch. Beau gets a business proposition from Neumann's Hill. A face from Maggie's past arrives with news.

When Colt lands in trouble covering for Rooster, he tries to cash in a favor. Beau invites Joanne to stay at the ranch. Colt plans a surprise for Abby.

Beau's at the end of his rope and decides to teach Colt and Rooster a lesson. Mary realizes she needs to choose between Rooster and Nick.

Nick confronts Rooster. Running out of options, Colt reaches out to Lisa Neumann. Joanne urges Beau to make peace with Colt.

While Abby's in Denver teaching, Colt works to rebuild the Peterson ranch. Rooster misses his first day of work.

After a fight with Nick lands Colt in hot water, Mary presses her ex for the truth. Beau delivers troubling news.

Beau intervenes to keep Colt out of trouble. Abby and Colt follow a lead. Maggie returns to Garrison, and Mary wrestles with guilt.

One month later, tensions run high as Colt and Abby scramble to get ready for the baby. Lisa Neumann makes Beau an offer.

Colt tries to keep his cool as he worries about Abby -- and wonders if he's ready to be a dad. Maggie catches Mary in a lie.

While Abby and Colt struggle with parenting an infant, another new arrival shakes things up at the ranch. Maggie confronts Mary.

Beau's softer side emerges when he takes Luke under his wing, but Colt doesn't trust his cousin. Maggie comforts an exhausted Abby.

Money troubles put a strain on Colt and Abby's relationship. Beau tries to get Luke help for his PTSD but refuses to bail Colt out of a jam.

Colt hides the truth from Abby as their financial woes go from bad to worse. A drunken night leads to an awkward morning after for Mary.

Beau issues Luke an ultimatum. As Colt tries to prove himself to Abby, Luke makes him an offer -- but Mary drives a wedge between them.

Abby asks Colt for space, but he finds every excuse in the book to drop by. Luke and Mary tie the knot in Vegas. Lisa Neumann accuses Colt of theft.

Back in Colorado, Luke works to win back Colt and Beau's trust. Abby invites Colt to a teachers' mixer. Mary struggles to stay clean.

Beau gives Colt a taste of his own medicine. Mary asks Luke for help paying the mortgage. Colt confronts Abby about not getting to see Peyton.

Joanne shares difficult news with Beau. Abby helps Colt with a business idea. When Mary goes missing, Heather takes drastic measures.

Out on bail, Mary breaks into her old house to grab her stash. After a talk with Dale, Joanne has a change of heart. Colt and Beau confront Lisa.

At Colt and Luke's encouragement, Beau and Joanne plan a celebration. Abby asks Colt to go to counseling. Mary's downward spiral continues.

Colt asks Abby to lie to the police. Joanne and Beau have a heart-wrenching talk about the future. Mary tells Luke she wants to go to rehab.

Abby and Beau pressure Colt to take Lisa's deal, but support from the local ranchers leads him to waver. Stress causes Luke to lash out.

Colt tries to round up the other ranchers to give Neumann's Hill some competition. After another argument with Abby, Colt signs the divorce papers.

Colt, Beau and Luke bond during a road trip to New Mexico. Back home, Abby runs into Mary and Nick.

Luke, Colt and Beau find Mary in bad shape in Nick's trailer. While Luke brings Mary back to the ranch, Colt and Beau wait for Nick.

To celebrate their last Thanksgiving on the ranch, Colt and the guys go on a turkey hunt. Mary checks into rehab.

Abby invites Colt out for a birthday dinner ... which might be a date. But the plan goes off the rails after Colt has an argument with Luke.

As Colt battles the elements, he leaves Abby a poignant message. Armed with a new perspective, Beau surprises Joanne.

Colt finally wins back Abby's trust -- but he's afraid to tell her he knows who killed Nick. Beau and Joanne look for a house together.

Maggie returns from Florida with news. When Dale uncovers a problem with the herd, Colt weighs whether to tell Lisa Neumann.

Luke urges Mary to go back to rehab. The police find a gun near the trailer and make an arrest, leaving Colt struggling with his conscience.

Luke's friend from the service offers him a job. Meanwhile, trouble brews with the co-op. Maggie tells Beau that she's met someone new.

Jerry warns Colt that Lisa Neumann has a good case against him. And when Luke bails on work, Colt has to miss Peyton's baptism.

In the series finale, Luke opens up about his struggles, Maggie throws one last Christmas party at the bar, and Colt gives Beau a heartwarming gift.