It all depends on how long the particular fertilizer you are using lasts. I fertilize my pepper plants once a year because I use 360 day Nutricote.

If I'm using the regular granular that is not timed release, it depends on how much it rains. If it's raining a lot, I fertilize lightly once a week. During dry season, I do it less, just depends on how much rain. If you have a timed sprinkler that waters frequently, I'd say once a week. Same goes for most timed release, except Nutricote. It's formulated to only release nutrents if the soil temperature is above 70 degrees, so it releases more slowly and lasts longer. It goes under the name Dynamite, I think, at some stores.