On January 26, 2020, Rash won his 15th PBA Tour title at the PBA Oklahoma Open. He qualified as the #5 seed for the stepladder finals and won all four matches to win the title, defeating Packy Hanrahan, Jesper Svensson, Brad Miller, and top seed Ryan Ciminelli. On June 13, 2020, Rash won the PBA Summer Clash, a non-title made-for-TV event held in Jupiter, Florida. Rash outlasted nine other competitors in the one-ball elimination tournament, surviving two sudden-death tie-breakers on his way to defeating Bill O'Neill in the ninth and final round. On October 4, 2020, Rash won the PBA World Series of Bowling XI Cheetah Championship held in Centreville, Virginia. (Qualifying rounds were held in Las Vegas in March, after which the event was postponed due to the COVID-19 pandemic.) As the #3 seed for the finals, he defeated Darren Tang, Packy Hanrahan, and top seed E. J. Tackett to claim his 16th PBA Tour title. This was Rash's first title in a World Series of Bowling event after 15 final round appearances, which included four runner-up finishes.
Rash now resides in Montgomery, Illinois with his wife Sara and their daughters Kaylee and Olivia. The couple is expecting their third daughter in July, 2020.