Two motocross riders were airlifted to hospital from events in Waikato today.

The first incident involved a nine-year-old boy who came off his motorcycle at a southern Waikato motocross event.

He fell while trying to avoid being hit by another bike but was then hit by a third bike.

The Waikato Westpac Rescue Helicopter flew the boy from the event at Aria, Waitomo, to Waikato Hospital in Hamilton.

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Early this evening the helicopter was dispatched to Glen Murray west of Te Kauwhata after a teenage girl fractured her leg during a separate event.

The 16-year-old sustained a fracture to her right leg in a crash. The Auckland resident was transported to Middlemore hospital.