final transplant

so i know in indoor you want to transplant at least 2 weks before you flip to flower, but for outdoor when is the latest you should be transplanting into a final pot?

i start mine indoor then once they establish a nice rootball and can handle some abuse, usually about 1 ft. in height, its in the backpack and to the grow spot. then they are transplanted into 1-2 gal pots. once they show sex, then the final transplant takes place.