November was the busiest month with 225 arrivals - more than half the total arrivals of 414.
May accounted for the most departures at 144.
In comparison, 93 yachts arrived in Whangarei and 130 departed between April last year and March 2016.
The yacht-arrival season in Northland typically starts mid-October and continues to mid-December.
Arrivals include returning locally registered yachts and a flotilla of foreign craft, from solo sailors to superyachts.
Customs Minister Nicky Wagner said the yachts brought great economic benefits to Northland and to New Zealand in general in exchange for our well-known sights, hospitality, and marine services.
"Customs streamlined its processes and doubled the temporary entry period for yachts to 24 months a couple of years ago, meaning they can stay for longer without paying duty or taxes," the minister said.