New Zealand used to have one of the strictest COVID policies out there when measured against all other countries, however their tune has changed as the COVID situation continues to be dynamic. New Zealand no longer requires proof of COVID vaccination to obtain a travel visa or to enter the country for US based travelers.
For the latest policy, please refer to the How to Prepare to Fly to New Zealand site provided by the New Zealand government.
American travelers need to secure their NZeTA before flying to New Zealand.