Fig trees are hardy, enduring lots of heat and a fair amount of cold pretty well, hardy to USDA zone 7 and higher, so if you have at least a month or two before your first 'severe' frost, still plenty of time. If you end up having to plant in the summer to meet this time frame, plant early in the morning or late in the evening when the summer heat has lessened, be gentle when handling the root ball, and then water well.