is 36F to cold to hibernate ants?

[MichiganAnts]

I've been trying to use a natural hibernation by leaving the nests on a cold basement floor in a closet we dont use. however mother nature is screwing me over and we are having a heatwave (its 71F outside, this time last year we had snow) so the floor is only about 50-60F. now i know it will get colder out and the floor will cool. but that could be a month away, and i plan on waking my colonies up January 14th (i put them on the floor October 14th).

But now i just want them to hibernate so i will leave them be. but my fridge is at 36F, is that too cold to hibernate? This is my first hibernation so everything is new.

[Batspiderfish]

I would keep it closer to 40F. You want to avoid 32F, even though some ants can survive lower.