<Li> Elisha Cuthbert as Abigail "Abby" Phillips, a Garrison High School history teacher and Colt's high school and current girlfriend . Abby was in a five - year relationship with Kenny and was briefly engaged to him, but ultimately she broke it off and hooked back up with Colt . (recurring, season 1; main cast, season 2 - present) </Li> <Li> Sam Elliott as Beau Bennett, Maggie's ex-husband, and Colt and Rooster's father . A Vietnam War veteran, he has worked the ranch since returning from the war and taking it over after his father died . Beau is difficult to get along with, perpetually annoyed with everyone and everything . He detests many modern amenities and is easily angered by his sons' antics . Beau appears to be a Republican with a special affinity for Ronald Reagan but at times seems to despise all politicians regardless of affiliation . </Li> <Ul> <Li> Barry Corbin as Dale Rivers, a hearing - impaired veterinarian and close friend of Beau's </Li> <Li> Grady Lee Richmond as Hank, a regular Maggie's patron </Li> <Li> Bret Harrison as Kenneth "Kenny" Ballard, a Courtyard by Marriott manager and Abby's ex-fiancé </Li> <Li> Megyn Price as Mary Roth, a Cracker Barrel waitress and Rooster's older girlfriend </Li> <Li> Kelli Goss as Heather Roth, Mary's younger daughter and Colt's ex-girlfriend, was pregnant with their child . </Li> <Li> Molly McCook as Darlene Roth, Mary's older daughter </Li> <Li> Kathy Baker as Joanne, a Cracker Barrel waitress, Mary's friend, and potential new love interest for Beau </Li> <Li> Ethan Suplee as "Beer Pong Billy" Tompkins, a police officer and high school friend of Colt and Rooster's </Li> <Li> Aimee Teegarden as Nikki, Heather's friend and Billy's fiancée </Li> <Li> Chasty Ballesteros as Tanya Showers, a sexy weather reporter and Kenny's current girlfriend </Li> <Li> Laura Vallejo as Maria, a Maggie's waitress </Li> <Li> Sharon Lawrence as Brenda Sanders, a widowed hairdresser who befriended Beau when he and Maggie separated </Li> <Li> Maggie Lawson as Jen the engineer, who wants to build a pipeline underneath the Bennett Ranch . </Li> </Ul> <Li> Barry Corbin as Dale Rivers, a hearing - impaired veterinarian and close friend of Beau's </Li>

Who plays the pipeline engineer on the ranch