Kutcher confirmed the news on Tuesday via Twitter, revealing the final 20 episodes will take the show well into 2020.
"@theranchnetflix is coming to an end, but not just yet," he wrote. "We're excited to bring you the final 20 episodes - 10 streaming later this year (2019) on @netflix, and then 10 more in 2020. Stay tuned!"
In the programme, the actor plays a football star who returns home to his family's Colorado ranch after his sports career stalls.
Danny Masterson was also an original cast member, but he was written off the show amid ongoing rape allegations made by four women against the actor.