Do what Martin says. It's very good advice. I will just reinforce the need to keep your fig tree as cold as possible without it getting dangerously damaging cold. The cold will keep your tree in a dormant state, no growing until spring.

If it's too warm, growth will commence, and it will most likely be weak and spindly.

Moses

Well, I only have outside, and inside. I have the floor of an old enclosed garage that's now part of the central heat system, so I took a guess that below the windows might be 50.

I can also leave it inside my actual garage, but I doubt it would be any warmer there than just leaving it outside.

Maybe it would be best in light of this, to just plant it in the ground in September or October, mulch heavily and pray to the fig gods?

Or, I saw someone allude to keeping cuttings in the refrigerator...I could do that possibly...it won't freeze..but darn close.

An enclosed garage even without heat, if the floor is flush with the ground, will be significantly warmer than the outside in the winter. Warmth from the ground will keep it warmer than the outside. Keeping the wind out, sealing cracks or window air leaks, could help. Put a thermometer in there this early winter and confirm this. My garage is not heated, has a cement slab floor, is attached on one side to the house, and stays MUCH warmer than the outside unless I leave my garage door open for long

I would absolutely NOT plant a fig tree in the north in the fall - the roots would never get established to grow back from in case of die back

My garage is unattached and typically has the door open at all times. However, I could put the pot there and bury it under some blankets or some such.

I could probably wrap it at least a foot thick with blankets (moving blankets), and then one or two over top of it.

I bet your above plan will work. Put it in the warmest part of your detached garage, heavily insulated. Keep an eye on the soil in the pot. Do not let it get saturated wet, nor completely dry out. Usually a monthly check is all that's needed. Keep an eye on the branches for fungus.

Do not wrap it with anything plastic or tarps. Old quilts, blankets, woven throw rugs, etc, should work fine. You're probably wintering it in the equivalent of zone 8 with your garage location with all that protection. It will definitely be warmer for the fig tree in there than zone 7 outside, with that heavy protection. Zone 8 is good, in ground, fig country with no winter protection. It should come through winter very well.

Why have you chosen LSU Purple? My tissue cultured LSU Purple, pot grown, is not my most vigorous fig tree. I may have a dud....healthy looking, but smallish leaves, more slender stems than most, and no figs yet. It is old enough to give young-tree type figs, but NADA! It may need more time to kick in, or it is not adaptable to pot culture. Every fig variety is different, and specimens of the same variety do not all grow the same either.

Moses