The White Ferns have held off the West Indies to prevail in a T20 thriller at Pukekura Park.
Spinner Anna Peterson stepped up to deny the visitors the five runs they needed for victory with a masterful final over, taking two wickets and effecting a run-out.
The win clinches the five-match series for the New Zealanders with two games to spare.
Captain Suzie Bates lead the way for her side with an unbeaten 52 on the spinner-friendly pitch as they set the Windies a target of 134.
Leigh Kasperek (3-31) then spearheaded the bowling attack to set up a scintillating finish in front of a healthy crowd in New Plymouth.
The sides return to Pukekura Park on Thursday before closing out the series in Hamilton on Sunday.