Officials said the buses had been parked at the facility since June 8 and were awaiting scheduled summer maintenance.
It appeared a bus parked between the others caught fire and the flames spread to other vehicles on either side. Three buses were a total loss, a fourth was heavily damaged while a fifth had smoke damage.
The cause of the fire was unknown. Officials said the SBI had been called in to investigate.
There were no injuries.
The buses were valued at $100,000 each.