I have 8 kits now that are 4 weeks old and earlier this week here in ohio it got down right cold one day the warmest it got was 9 degrees. I left mine out in the cage and they did just fine I left the nest box in to give them a little more warmth but every morning when I went out to feed and thaw water bottles before work at 4 am all 8 were out of the box anyways.
But I also have mine in a enclosed shed attached to the garage with some drains cut in at floor level for vents and for cleaning in the summer when I take the hose in to spray down and clean the concrete floor. So drafts and wind chill is not a problem for me.
thank you everyone for the advice! i did not feel comfortable removing the kits from the hutch so i decided to leave them out there. it got down to 7 degrees and they all survived.
Thats great!!! Without wind chill or dampness, rabbits can survive temperatures down to -35 F. I usually play it safe with the little ones. Your rabbits are adorable, btw.
What I do for my bunnies is set up heat lamps, it also drops very low here. I have raised the kits in the low temperatures before and they did fine as long as they had a good heat lamp.