He split the next year between the Single-A Burlington Bees and Vancouver, accumulating a 6–4 record and 3.60 ERA in 19 appearances.

[5][6] He split the 2015 season between Midland and the Triple-A Nashville Sounds, pitching to a 3.71 ERA with 57 strikeouts in 47 games.

[7] On April 5, 2016, Frankoff signed a minor league contract with the Los Angeles Dodgers organization.

[8] He split the year between the Triple–A Oklahoma City Dodgers and the Double–A Tulsa Drillers, accumulating a 4–4 record and 3.89 ERA in 28 total games.

One source said, "he checks most of the boxes ... he rarely walks hitters, which is a standard draw for the Cubs brass," in explaining why Chicago signed him.

[13] Frankoff was granted his release by the Mariners on December 10, in order to pursue pitching opportunities in South Korea.

On February 14, 2020, Frankoff signed a minor league contract with the San Diego Padres organization.

On October 19, Frankoff was outrighted off of the 40-man roster and assigned to the Triple-A Tacoma Rainiers[20] He became a free agent on November 2.

[5] On September 1, 2022, Frankoff signed with the High Point Rockers of the Atlantic League of Professional Baseball.