Lancashire firefighters will strike from 7pm tonight, Christmas Eve - the first of three dates over the festive period.
Members of the Fire Brigades Union (FBU) are embroiled in a row over pensions with the Government.
Tonight’s stike will last until midnight.
The second date is New Year’s Eve between 6.30pm and 12.30am and a strike is also set for January 3 between 6.30am and 8.30am.
Lancashire’s chief fire officer, Chris Kenny, said: “This is a national dispute between the FBU and Government and is not a dispute between Lancashire Fire and Rescue Service (LFRS) and our firefighters.
“We do have a significant number of our staff who have given a commitment to maintain emergency cover and as a result the public can be reassured that the service plan to keep the majority of fire engines in Lancashire operational during the dispute period.
“We would urge all members of the public to be extra vigilant however and be aware that for minor fires in particular, there may be a longer wait for a fire engine.
“I ask the public to take extra care to prevent a fire happening.