A woman will be flown to hospital in a critical condition after her truck rolled 100m on a farm near Queenstown.

Police were called to an incident at Halfway Bay Station, which borders Lake Wakatipu, at 2.30pm.

They said a vehicle had rolled from a farm track with the woman inside. A rescue helicopter was called to assist. A winch was required to get the patient into the chopper.

She will be taken to Dunedin hospital.

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In another serious accident, police and St John ambulance attended an incident on a farm in the central Hawke's Bay town of Omakere at around 4.45pm today.

Police said the incident reportedly involved a man operating a bulldozer.

Work Safe will be investigating the accident but the health status of the male driver is not known.