Thank you for your advice "Dav4." I did move to and from the detached garage last year as well.
Rockm, I'm weighing my options. I did extensive root pruning to a Japanese Maple 'momiji', Corkbark elm, 2 amurs, and 2 crabapples 'mary potter'. They are all wired into Anderson flats which aren't very conducive to moving as they tend to fold when carried around so my fear is unnecessary disturbance to the roots in that manner as well. Until they do form leaves, is it safe to store in detached garage until leaves do appear or I can clear out our unheated back porch which has windows facing south, east, and west and store them there? Looks like a cold spell this week:
Today: 38/36
Wed: 40/24
Thurs: 32/22
Fri: 31/21
Sat: 32/21
Sun: 34/23