On April 6, 2017, Howard signed with the Atlanta Braves in a minor-league contract. Howard started with Braves extended spring training in Florida before he was assigned to the Gwinnett Braves of the International League. If he was added to the 40-man roster, he would have received a $120,000 minor-league salary or a $750,000 major-league salary, plus potential bonuses based on plate appearances. Braves general manager John Coppolella explained that Howard's signing was "just a no-risk proposition for a player with good makeup who was excellent in the second half last season, he's in good shape and has been training and waiting for an opportunity." However, he hit just .184 with one home run and 11 strikeouts in 42 plate appearances for Gwinnett, and was released on May 8.
On August 12, 2017, Howard agreed to a minor league contract with the Colorado Rockies and was assigned to the Triple-A Albuquerque Isotopes. He elected free agency on November 6, 2017. On September 4, 2018, Howard announced his retirement by publishing an article on The Players' Tribune.
In May 2017, Howard announced his new role as Partner at SeventySix Capital, a Philadelphia-based venture capital firm led by Wayne Kimmel and Jon Powell.