you can extract now, if you remove the super. Do not break up the brood boxes though. they have been working on sealing those puppies for awhile now and that will help them through winter staying sealed is how I think of it. like the others mentioned I think. the worse thing is you are going to have cooler temps when extracting and therefor it won't flow easier for you, may have to use a bit of a heater or warm area when extracting, but everything should be fine. Now is the time to be letting them bee though and letting them finish up and prepare for winter as best they can though imo. langstroth hives look like they fit ok to me, but truth is, they do not, fit that well to keep out bitter cold or hold in heat, prevent moisture from seeping in, and widening the gaps even when it freezes and expands thus letting in even more cold and moisture.