mike, i would still leave them in the garage until the outside is at least 40 degrees at night if the tree is much older. if it's new tree that's rather young, i'll wait till it's at least 50 degrees low.
now, having said that, you can do "fig shuffle" if you are interested in moving the containers in and out of the garage everyday. when the temp is high during the day with good sun, leave 'em outside. bring it back in before the temp drops at night.