The man's vehicle was found around 9.30pm down a bank, off Lees Valley Rd in Oxford. The man, aged in his 20s, was found a short distance away. He was the sole occupant of the vehicle, police said.
His name would not be released until his next of kin had been notified, police said.
It was not yet known if the death would be included in the official holiday road toll, as it was not confirmed if the death occurred on a public road. Police were waiting to confirm the status of the road with the New Zealand Transport Agency (NZTA).
The two deaths followed two other fatalities this weekend - Lisa Yieng, 36, a Malaysian-born wife and mother died in a car crash in Te Puke on Saturday morning, while a woman was killed when she was thrown from a motorbike and into the path of oncoming traffic in Canterbury on Sunday.
Ms Yieng, fruit-picking worker, died on her way to work at EastPack. She pulled over on State Highway 2, about 5km from Te Puke, to let cars pass her so she could turn. She made a U-turn into the path of a 40-tonne laden logging truck.
She was described as a well-respected and tireless worker, who had lived in New Zealand for seven years.
In Canterbury, the woman was a pillion passenger of a motorbike, when the bike hit the back of a turning car about 40km north of Christchurch. The woman and the motorbike driver were flung onto the other side of the road. It is believed the woman was then hit by an oncoming car, and flung underneath a van.
The crash also put the motorbike driver in hospital with "nasty" leg injuries. Three other people were treated at the scene.
No-one from the national road policing team was available to speak to today about the road toll, a police spokesman said.
Meanwhile, a series of crashes around the country have left a number of people injured.
Three people were seriously injured following a collision on State Highway 57 in Levin this afternoon.
Two cars were involved in the collision, with occupants of both cars taken to Palmerston North Hospital - one in a critical condition and two stable.
A 41-year-old woman suffered serious multiple injuries in a crash near Wairoa at 4.30am today. She was flown from Wairoa Hospital to Hawke's Bay Regional Hospital for further treatment.
In other incidents, a car became airborne and ploughed through three properties, coming to land in the first floor deck of a house in Auckland's North Shore this afternoon. The driver of black two-door hatchback was taken to hospital in a moderate condition after the crash on Lynn Rd, Glenfield.
And a number of people escaped injury after a four car nose-to-tail incident in Hamilton around 5.30pm.
Two people suffered minor injuries in the incident on Ohaupo Rd, near Normandy Ave, ambulance said, while eight people escaped without injury. All 10 were checked over at the scene, and transported to Waikato Emergency Department.
The official Queen's Birthday holiday road period runs from 4pm on Friday, May 29, to 6am on Tuesday, June 2.
Last year's Queen's Birthday road toll was five, from a total 87 reported injury crashes.
