Firefighters from Louth, Market Rasen and Binbrook were called out to a huge fire on a farm at Ludford last night (Thursday).
Lincolnshire Fire and Rescue says a barn and 200 hay bales have been destroyed.
This morning the fire in Redhill Lane is being allowed to burn out under the supervision of the fire service as one fire engine remains at the scene.
Lincolnshire Fire and Rescue says the cause of the blaze is under investigation.
The alarm was raised at 10.10pm.
• Lincolnshire Fire and Rescue said moments ago that all fire engines have now left the scene but the incident will be inspected this afternoon.