Hardening Off Onion Transplants

_I need to make space in our heated greenhouse and planned to move our trays of onion transplants to our unheated caterpillar tunnel. We are supposed to get a couple nights around zero degrees this coming week. Will the trays of onions be OK with this?_Just to be clear, I’m not planting them, just moving the trays. Thanks!

How old are they? I would say so, I typically would start planting them soon anyway and they can take a frost, so I expect zero degrees would be just fine. If you are worried just put a row cover over them and make sure you water them before you finish your day.