I think that early September is pushing it a bit but you should be ok. What'll probably happen is that they will get established a bunch sooner and start putting out new growth before the ground freezes. You may be able to mulch this growth once winter sets in and save all of it but I'd expect that a least some of it will die if you really get a stretch of -10 weather. In spring, it might be a little slow since the growth will need to be replaced and you might need a touch more fertilizer to help the plants do this but all in all they are tough plants.

Or, you'll get an early winter with cold early on and the garlic will be just like normal ... either way I'd give it a shot.

Thank you for your info.
OK I will go ahead and plant them right after Labor day and see what happens next spring. -- thanks