Colorado drafted Butler, 26, in the supplemental round (46th overall) of the 2012 First-Year Player Draft. The 6-foot-2, 180-pound Butler was 4-4 with a 2.49 ERA in 11 starts for the Drillers this season.
In 52 minor league games (51 starts) with four teams Butler is 20-10 with a 2.38 ERA and 238 strikeouts.
To make room for Butler on the roster, the Rockies placed LHP Boone Logan on the 15-day disabled list on Thursday with left elbow inflammation.
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