A man in his thirties was seriously injured in a logging accident in the Waimarino Forest on Thursday morning, St John Ruapehu manager Mark Fredericks says.

"As far as I am aware a tree has landed on our patient. The tree had been removed before our arrival."

St John got the call just after 10am. The accident happened during a commercial logging operation in forest 18km west of Raetihi.

A road ambulance was able to get close to the site by 11.10am, and the Palmerston North Rescue Helicopter arrived about the same time.

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The man was stabilised by an intensive care paramedic, before being flown to Waikato Hospital. He was still in a serious condition yesterday, Mr Fredericks believed.