A farmer who rolled his vehicle 20-25m down a hill near Puhoi, north of Auckland, this evening has been flown to hospital in a serious condition.

A spokesman from the Auckland Westpac Rescue Helicopter told the Herald they were called to the incident about 7.15pm.

Reports indicated the farmer, a man aged in his 40s, had driven off a farm track and rolled his vehicle down a ravine.

The spokesman said the farmer extricated himself from the vehicle and crawled back up the hill where he called out for help.

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It is unclear who came to the man's aid, but St John was called and notified the rescue helicopter.

The helicopter had to land on a neighbouring property because the original landing zone had too much dust and debris.

The farmer was brought to the rescue helicopter in a scoop placed on the back of a ute accompanied by St John and other members of the public, the spokesman said.

He had multiple injuries and was flown to hospital in a serious condition.