Firefighters were called after a suspected arson attack in the Blyton area.
One crew from Kirton in Lindsey and two from Gainsborough were called to a barn on fire at 10.49pm last night (Thursday Sept 20).
The cause of the fire is thought by Lincolnshire Fire and Rescue Service to be deliberate.
The fire caused severe damage to a portable framed barn and a large quantity of hay bales.
One crew remained at the scene overnight to allow the fire to burn out.