Both fires were started at the Flower Estate in Wincobank.
A spokesman for Elm Lane fire station confirmed they were called to the first one at around 10.30pm.
He said: "We sent three fire engines out, but the fire wasn't as big as reported so we sent two back."
Then, at 3am they were called out to another, smaller fire on the estate, to which they sent one fire engine.
The fire service believe both fires were started deliberately.