Howard will be called up from Triple-A Round Rock to start Tuesday's game against the Orioles, Joseph Hoyt of The Dallas Morning News reports.
Howard hasn't appeared in a big-league game since late April, but he'll get another shot at the top level after posting a 1.59 ERA, 0.53 WHIP and 25:3 K:BB in 17.0 innings over his last three starts with Triple-A Round Rock. He'll be joining the rotation as a replacement for Taylor Hearn, who was sent to Round Rock last week.