A man is in critical condition after the car he was in collided with a logging truck and trailer north of Auckland in the early hours of this morning.

The head-on crash happened on Kahikatea Flat Road, Waitoki, about 3.10am.

St John Ambulance attended the incident, with four ambulance vehicles treating two patients.

The driver of the car, reportedly 29, is in critical condition and has been taken to Auckland City Hospital.

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Another person has minor injuries.

The road is now closed and a police spokesman said it will not be reopened until well after 7am.

Road diversions are in place but traffic is not affected at this stage, he said.

A scene examination is underway.