The license history for KZCO-LD dates back to 1971, when it was authorized in
Estes Park, Colorado, as K65AA. This was one of five UHF translators authorized to Translator TV, Inc., to rebroadcast Denver stations. In 2003, it moved to channel 27 as K27GF, soon changed to KCIN-LP. In 2005, the
McGraw-Hill Company, owner of KMGH-TV, acquired KZCO-LP and used it as one of several transmitters for a regional
Azteca América service, broadcast from transmitters in Denver (KZCO-LP),
Windsor for
Fort Collins and
Greeley (KZFC-LD), and
Colorado Springs (
KZCS-LD). On October 3, 2011, McGraw-Hill announced that it would exit from broadcasting and sell KMGH-TV, KZCO-LP and its other television stations to the
E. W. Scripps Company. The sale was completed on December 30, 2011. In 2013, KZCO signed on a digital signal on UHF channel 17 to serve as a fill-in translator of KMGH-TV, which has experienced issues with signal reception in portions of the Denver market since the
digital television transition on June 12, 2009, due to that station operating its digital signal on
VHF channel 7, which is prone to signal interference. On August 11, 2014, the FCC canceled the KZCO-LP license, being replaced by KZCO-LD. In early 2021, the simulcast of KMGH-TV's main channel moved to a subchannel of KSBS-CD, a translator of KCDO-TV. ==Subchannels==