Firefighters will be picketing outside their Hemel Hempstead base on Queensway as part of national strike action this weekend.
The Fire Brigades Union strike is due to run for five hours on Saturday evening, from 6.30pm to 11.30pm.
Dacorum crews say they are taking part in the walk-out, but as yet have not made decisions on whether or not they will be providing emergency cover.
This is the second strike Dacorum firefighters have supported in under a month, and continues the dispute over government attempts to change the rules on service pensions.
Hemel Hempstead White Watch firefighter Rob Holmes said: “People on duty on Saturday evening will walk out and will be picketing outside.
“If there are people who want to come down and support us they are more than welcome.”
During the last national strike on Wednesday. September 25, all Dacorum 999 call-outs had to be attended by the nearest crews available from the rest of the county.
Herts’ chief fire officer Roy Wilsher has urged people to take extra care during the strike action.
He also said: “In the event of a fire you should still get out, stay out and call 999 – you will get an emergency response.”