Hauraki will continue to broadcast on AM, and both stations will be available in crystal clear digital sound on iHeartRadio.
The Coast line-up will include former Karamu High head boy and New Zealand's Got Talent judge Jason Reeves, who will present Coast Breakfast with co-presenter and former TVNZ presenter Bernadine Oliver-Kerby.
"Our new line-up is Jason Reeves and Bernadine Oliver-Kerby on breakfast, Lorna Subritzky on Days, Jason "JT" Tikao on Drive, and Rick Morin on Nights.
"Listeners will continue to hear the classic hits of the superstars from the 60s, 70s and 80s.
"Monday will also be the first day on air for Jason and Bernadine on breakfast, but we will continue to play the same amount of music with all the latest news, and early morning information along with lots of our listeners sharing their stories with Jason and Bernadine."
NZME entertainment group director Dean Buchanan said the change would only effect listeners in Hawke's Bay.
"Coast as a radio station is already New Zealand's number one station for people aged 40 plus. It's been very popular for years across the country but ever since we introduced Coast on AM in Hawke's Bay, we have had a lot of listener demand from people wanting it on FM. There is a fair proportion of people 40 plus, in the prime of their life in Hawke's Bay so it's the perfect brand to have on FM in Napier and Hastings and surrounding districts.
"It's a no-brainer really, it's something that's been asked for by listeners and by advertisers who are very keen to be part of the brand.
"We see great potential, we know people love the music and of course, listening on FM is better. The other key thing is we have a new breakfast show starting on Monday. That's Jason Reeves who is a Bay local and Bernadine Oliver-Kerby, who many will know from Sky Sport television.
"Jason and Bernadine's show starts Monday, so there will be a real Hawke's Bay flavour."