It was the first time since the outbreak took hold in mid-March that the country has reported zero new cases.
Director-General of Health Ashley Bloomfield said the figures were clearly encouraging and a cause for celebration but it won't be known until later this week if new cases continue to pop up in the community.
New Zealand closed its borders and imposed a strict monthlong lockdown after the outbreak began.
The lockdown rules were eased a little last week to help reopen the economy, but many restrictions remain in place. Many businesses -including most retail stores and sit-down restaurants - remain closed, most school children are learning from home, and people are required to maintain social distancing.
New Zealand has reported nearly 1,500 cases of the virus and 20 deaths.