The black, white and blue alternative Silver Fern flag will soon start flying over 250 sites across the country, including the Auckland Harbour Bridge.
The flag, designed by Kyle Lockwood, was named the winning design in the first referendum on changing New Zealand's flag late last year.
Deputy prime minister Bill English said having it side by side with the current flag would help people make a decision in the final flag referendum.
The flag will fly from the selected sites from this Friday.
Transport minister Simon Bridges said the alternative flag would be up on the Harbour Bridge every day from the end of this week except for Waitangi Day, when the Tino Rangatiratanga flag will be flown.
People can start voting in the final flag referendum from 3 March.
Voter turnout for the first referendum was 48.78 percent.
The government is estimated to have spent $26 million on the flag change project,