The A420 was closed for a time and police were diverting traffic after four fire engines were sent to put out the blaze at a farm at the top of Riding Barn Hill.
The cause of the fire is not yet known.
Meanwhile Avon Fire & Rescue Service this week warned people not to let their guard down as temperatures rise. Crews have been called out to deal with disposable barbecues being put into bins before they are cool, people needing rescue from the water and grass and tree fires.
AF&RS Station Manager for Community Safety, John Rides, said: “Over the last few days we have attended a number of incidents where disposable barbecues have been placed in dustbins before they are cool.
“This has led to fires starting, which could have spread to nearby buildings and endangered lives.
“The dry conditions also mean we have been dealing with grass and tree fires either caused accidentally or in some cases deliberately.”
He also said that swimming in lakes and rivers could be dangerous even for a strong swimmer and that attempting to swim after drinking alcohol could prove fatal.