Webthe cdc recommends that individuals get their flu vaccination early in the fall, before flu season begins, and ideally no later than the end of october. Webthe cdc recommends you get vaccinated early in the fall, before flu season begins, and if possible, by the end of october. It’s important to not wait until flu season is in full swing or when there is an outbreak in your area to get a flu shot since it takes about two weeks.