The fire started at around 6.20pm on March 27 at the Rose Grove Caravan Park on Pilling Lane.
Two crews responded to a 999 call and arrived to find a plastic container well alight.
Firefighters stopped the fire from spreading to a nearby caravan using a hose-reel jet.
A spokesman for Preesall fire station said in a post to their Facebook page: "Your local fire crew have just been mobilised to reports of a fridge fire outside a caravan, upon arrival we located a well alight plastic container which was starting to spread to a nearby caravan, quick actions from crews resulted in I being stopped."
There were no casualties and the cause of the fire is under investigation.