More than 132,000 people attended the four-day event at Mystery Creek, near Hamilton, which ran from Wednesday to Saturday.
The highest attendance number ever was 133,000 visitors in 2017.
Organisers said attendance was up 20% on last year, and exhibitor sites were sold out ahead of the event.
"Fieldays isn't just an event, as this year has proved, it is a national strategic asset that brings together the best of our primary industries in one place," New Zealand National Fieldays Society Chief Executive Richard Lindroos said.
"Fieldays has proven it is a mega event."
"Beyond the numbers, success isn't just reflected in attendance figures, it's seen in the energy on site, the conversations happening, and the genuine connections being made," Lindroos said.
