Professional opinion?

Hey guys, it’s my first time wintering my Montezuma cypress saplings that I started this year. I have them in 5 gallon red tractor supply buckets right nowI have them in my garage cus I live in zone 4bThe garage stays at a cool 40~ f and higher and I was wondering if I needed to water them while they’re dormant, especially cus the soil is cold.I’d hate to kill them by not watering them and I’m also worried the water will freeze if I do water em.I would LOVE your guys professional opinion on my situation

Yes you must water. why are they inside now? they will not be dormant in that high temperature. 

Water freezes ar 32F/0C so at >40F it won't freeze.

Check the climate where the trees evolved. If the low temperature there is 40F or close then the garage is fine. If they get colder and that arear routinely freezes then they need a colder place.

Don't let the roots dry out. They don't need as much water but the need to keep the root ball moist.

There are noone in this forum that can give you a professional opinion, we are all hobbyists doing this on our spare time.

My amateur experience is that most trees do well kept cool but frost free in the winter. The only exceptions is pure tropicals which need a little warmer than just frost free, typical 10c whatever that is in F? The only other exception that I know of by experience is the siberian larch. They really need a solid long freeze or they die.

Sorry, do not know about the particular species in question. But I would try just above freezing.