The station signed on the air on February 25, 1981 as KQEZ "Easy Country 103" in Coolidge, Arizona. It was powered at only 3,000 watts, a fraction of its current output, so the station primarily focused on the Casa Grande Valley. In 1991, original owner Larry E. Salsburey sold the station to Scott Christianson's Chriscom. KQEZ, however, fell on financial hard times in the early 1990s. In September 1992, KQEZ's disc jockeys informed listeners that they had not been paid in a month; at that time, owner Christianson said he could not pay workers because of $200,000 in debt. In April 1993, the station went off the air altogether. Two months later, the station was sold to J.M. Wolz, the first of three license transfers in a year. Wolz put the station back on the air with a classic rock format as KAZR. A signal upgrade followed providing the southern sections of the Phoenix, Arizona, area with a clear signal. On March 20, 1995, the format was flipped to a modern rock/top 40 hybrid branded as “The Blaze.” A change of call letters to KBZR followed the change of format. In the spring of 1996, the station began moving its transmitter closer to Phoenix. At the same time, the station began a 6-month stunt of an automatedRhythmic Oldies format, only going by the moniker "S.T.E.V.E." The name was an acronym standing for "Songs That Everyone Vociferously Enjoys." On October 30, 1996, at 3:30 p.m., the station completed its upgrade, and flipped to a hip hop-emphasizing rhythmic top 40 format as "103.9, Arizona's Party Station." The call letters were changed in the spring of 1997 to KPTY to reflect the station branding. Despite the station's signal limitations, KPTY did well in the ratings. In fact, rival KKFR, which was airing a broad-based Mainstream Top 40 format at the time, began to move towards hip hop-emphasizing rhythmic top 40 format as well, and took away much of KPTY's audience. In 1998, KPTY evolved to a hybrid hip-hop/modern rock format shortly followed by a change of branding to "Party Radio @ 103.9." During the last week of 1999, KPTY stunted with a supposed broadcast hijacking with buzzing sounds and audio glitches in the songs, legal IDs and sweepers, while the DJs were talking. On December 31, 1999, KPTY began stunting with a 24-hour loop of "We Like To Party" by The Vengaboys. On January 1, 2000, KPTY returned to a rhythmic top 40 format as "103.9 The Party". In October 2001, the station's owners were persuaded by the staff of the original KEDJ "The Edge" on 106.3 FM and 100.3 FM to drop the Rhythmic Top 40 format and bring the KEDJ call letters and its alternative rock format over to 103.9 FM. KPTY flipped to "The Edge" exactly 5 years after the station began: October 30, 2001 at Noon. The 106.3 and 100.3 frequencies originally used by "The Edge" were sold to Hispanic Broadcasting Corporation and switched to a Regional Mexican format. In April 2008, the morning show "The Morning Ritual" was dropped in place of the syndicatedAdam Carolla Show from Los Angeles. The Adam Carolla Show was cancelled on February 20, 2009, due to Carolla's flagship stationKLSX-FM flipping formats. It was quickly replaced by another Los Angeles-based morning show, Kevin and Bean. In July 2009, the station relaunched as "FM/1039...Where Music Matters." FM/1039 Launched under then-Program Director Tim Virgin. That same month, Virgin left to do Afternoons at Q101 in Chicago. Former program director Marc Young returned to the station and took over afternoon duties as well. On January 8, 2010, the "FM 103-9" branding was changed to "X 103-9...Alternative Rock Now." On February 2, 2010, under the direction of Program Director Marc Young, the station's call letters were changed from KEDJ to KEXX to align with the "X 103.9" branding. On January 12, 2012, the station dropped alternative rock for classic rock under the name "My 103.9." "Personal Jesus" by Depeche Mode was the last song under their alternative rock format. As of June 2012, the station turned to a Hot AC format, still under the name "My 103.9." On December 27, 2013, Trumper Communications and Riviera Broadcasting Group announced that they would merge their Adult Top 40 outlets into one simulcast, with KMVA and KEXX becoming "Hot 97.5/103.9 Trending Radio." The combined signals made their launch on December 31, 2013. On April 9, 2015, its HD2 digital subchannel became the high definition simulcast of KOAI 95.1 FM in Sun City West. On June 20, 2016, KEXX changed its call letters to KZON.
