State Highway 25 is closed between Wharekaho and Kuaotunu following a serious crash this evening.

A police spokesperson says emergency services are responding to a serious crash involving a motorcycle on Kuaotunu Wharekaho Road between School of Mines Lane and Wharekaho Road.

"Police were alerted to the crash at about 5pm," says the spokesperson.

"One person has serious injuries."

Motorists are asked to avoid the area.