"This is my first competition for some time so it is nice to start the year off with a win. Last year was good and consistent for me," said the world number sixth ranked rider.
"This gives me some confidence as I move into the international competition ahead."
Auckland's Kate Weatherly defended her elite women's downhill title in emphatic fashion.
She clocked 3min07s to win comfortably from Tauranga's Shania Rawson by 17 seconds with Auckland's Virginia Armstrong in third.
"I am so stoked. The track suited me so well and I've been training really hard," said Weatherly. "I get to train here on a regular basis as well so I am used to the terrain around here.
"For me now I will compete at Crankworx this week and look to head overseas for the World Cup circuit and hopefully the World Championships."
There were some outstanding performances from the top age group riders, none more so than Auckland teenager Blake Ross, who won the under-19 boys title. Ross, a member of Cycling New Zealand's Subway National Mountain Bike Performance Hub, clocked 2:50.537s, the fourth fastest time of the finals across all age groups.
Many of the elite competitors will now turn their attention to the international Crankworx competition in Rotorua starting on Tuesday.
Results:
Male, elite: Brook Macdonald (MS Mondraker, Napier) 2:45.380, 1; Keegan Wright (Unior/Devinci Racing, Rotorua) 2:48.817, 2; Wyn Masters (GT Factory Racing, New Plymouth) 2:50.683, 3.