The man sustained a suspected spinal injury.
The Toowoomba RACQ CareFlight Rescue helicopter was tasked on a hospital transfer to airlift the injured rider at 10.45pm last night.
The crew transferred the patient from Toowoomba to the Princess Alexandra Hospital.
He travelled in a stable condition.
This was the second quad bike accident the Toowoomba crew responded to yesterday.
A 13-year-old boy from Brisbane was airlifted from Boondooma Dam after he lost control of the quad bike he was riding.
The teenager suffered a suspected broken right arm and was flown to Toowoomba Hospital in a stable condition.