For my area in NW FL the recommendation is to stop fertilizer applications by the start of September. We would normally get our first frost in late Nov or early Dec, so that gives 2-3 months for the plants to slow down and harden off. You also need to stop any oil sprays about the same time as that somehow inhibits cold conditioning.
I don't know when you get your first frost there, but you should probably stop fertilizing 2-3 months before. Of course, you should not use controlled release fertilizer either.
-- Skeet