A man with serious head injuries walked "for a long time" to get help after a quad bike crash on a farm in the Coromandel.

The man, aged in his 60s, was injured after a quake bike rolled on a farm in Colville before 2pm yesterday, the Auckland Westpac Rescue Helicopter Trust said.

He walked "for a long time to get help", it said, and was eventually taken to a medical centre.

The rescue chopper was called out at around 2pm to airlift the man.

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He had serious head injuries, the trust said.

He was flown to Waikato Hospital.