The Rockies optioned Palmquist to Triple-A Albuquerque on Sunday.
Palmquist has made seven starts across his two stints in the majors this season, and he'll head back to Triple-A with a 7.63 ERA and 22:18 K:BB across 30.2 innings with the Rockies. Kyle Freeland (back) is expected to return from the 15-day injured list later this week to replace Palmquist in the rotation, according to Patrick Lyons of JustBaseball.com.