If those are the temps in the coop and the hen is not yet setting then they can freeze. Before mine were setting and we were going to have a freeze (not anywhere near as cold as you) I was gathering the eggs in the evening and bringing them inside for the night. I then put them back out after the temps warmed.Ya, what about that??!! 18'F overnight here, 7' tomorrow (yuck!)... Will all those eggs freeze?