It is a station of the ZM network, and is owned and operated by New Zealand Media and Entertainment.

In 1973 3ZM was joined with 1YD Auckland and 2ZM in Wellington to form to youth orientated ZM network, 1YD became 1ZM.

Listener interest was strong at first but later ratings dropped and the station was reverted to 3ZM playing the same music format as that of 1ZM and 2ZM.

Originally when ZM in Christchurch was switching to FM they believed they would be broadcasting on 92.9 MHz and printed stickers with this frequency on it.

The announcer now produced 3 separate voice breaks, programming between the 3 stations was not in-sync with each other due to varied lengths of voice breaks and advertising, often the final song heard each hour was cut short as the 3 stations synced together at the top of the hour.

In 2000 ZM created a nationwide network with all networked ZM stations receiving their content from Auckland, Christchurch remained a local station for the following year using the tagline "Today's Hit Music for Christchurch".

Prior the sale of Radio New Zealand's Commercial stations to The Radio Network in 1996, 91ZM, Newstalk ZB and Classic Hits (along with Radio New Zealand and the NZ Sound Archives) were located at Kent House on the corner of Chester Street West and Durham Street North (51 Chester Street West).

From the 1990s onwards The Radio Network Christchurch stations were housed in the Worcester Street building.

The Radio Network Christchurch never returned to their Worcester Street premises and eventually set up in a new location.