After a dozen years in the YES Network booth, Al Leiter will not return this season, The Post has learned.

The main reason Leiter is choosing to exit is to free up his schedule more so he can be around for his son, Jack, for his high school baseball season and beyond.

Jack, 18, is an All-American right-hander, who may be a top pick in this June’s MLB draft and has already committed to Vanderbilt, which is one of the elite baseball programs in the country.

“I’m grateful for my 12 years,” Leiter told The Post. “It was a family. I know it sounds like BS, but it is true. It is hard to leave. It is more about being able to see Jack and my kids (three daughters) doing their things.”

Leiter, 53, will continue with his studio work with MLB Network. He said he has more enthusiasm for talking about baseball there than he did on games in recent years.

Leiter’s decision came as a surprise to his boss, YES’ president of production and programming, John Filippelli. Filippelli had planned to up Leiter’s game schedule from 20 games to 35 to 40 this year.

“I didn’t see it coming,” Filippelli said.

Filippelli said YES will not add anyone new to replace Leiter. He said the breakdown on analyst games will be David Cone doing 80, John Flaherty 75 (including studio), Paul O’Neill 60 and Ken Singleton 25.

Michael Kay will be the lead play-by-player with Ryan Ruocco doing some series. Bob Lorenz and Jack Curry will be the main studio team.

Filippelli and Leiter have built a strong relationship over the years, dating back to when Leiter, most known for his Mets success, finished his career as a Yankee. Filippelli persuaded Leiter to join YES immediately after he retired from pitching in 2005, spurning the Mets and SNY.

Leiter had planned to take a year off before his next endeavor. The two have grown close, with Leiter describing Filippelli as a “TV genius” and Filippelli saying, “He is one of the nicest people I’ve ever worked with.”

Leiter leaves some other strong ties at YES. He has been close to Kay for a long time and specifically mentioned the family atmosphere created by producer Bill Boland and director John Moore.