A 21-year-old Tokoroa woman has suffered serious head injuries in a crash near Rotorua.

A police spokeswoman said the single-vehicle crash happened about 7.30am on State Highway 30 near Whirinaki Valley Rd.

An ambulance media spokeswoman said a woman had been taken to Rotorua Hospital with serious injuries.

A Rotorua spokeswoman said she had since been transferred to Waikato Hospital.

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A BayTrust Rescue Helicopter spokesperson said they flew the woman to Waikato at 1.30pm.