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â If you are dedicated, though donât have time to run your EMT training in parallel with your fire training, and assuming you are hired by the department on your first attempt, it will take you 3.5 to 4 years to become a firefighter (though you will be a probationary firefighter after 3 â 3.5 years).
In order to become a firefighter with the St. Louis Fire Department, you must do the following: 1  Have a diploma or high school equivalent. 2  Be at least 18 years of age and no more than 33 years of age (Up to 6 additional years for Military Service) 3  Apply for the position through the Department of Personnel.