Glaucus
Omono
I am not sure how the transport works. Could a trunk carrying your plants be parked outdoors overnight at altitude in Colorado? Probably not, but maybe you can ask Nuccio? They will know how much theis plants have woken up. And maybe on shipping their plants northward very early spring as well. There wouldn't really be a downside to having them hold off shipping until you are fully in spring as well.
Once they arrive at your place in good conditions, yeah you can just put them in a attached garage when frost is expected.
It is just that by moving them from Cali to MI in late March, you also kinda teleport them back into winter by maybe 2 months?
Plants are only winter hardy when they are dormant. If there is some dry windy weather with temperatures below 0C/32F, all new growth can be destroyed. If it is a wet cold and temps only drop below 0C/32F during the night for an hour or so, they are probably ok. But minimum ground temperatures are often different from normal night temperatures. A prediction may say it will be 2C/35.5F and then just as dawn is about the start, the clouds may clear up and your local ground temps may drop to -4C/25F, damaging the new growth.
Once they arrive at your place in good conditions, yeah you can just put them in a attached garage when frost is expected.
It is just that by moving them from Cali to MI in late March, you also kinda teleport them back into winter by maybe 2 months?
Plants are only winter hardy when they are dormant. If there is some dry windy weather with temperatures below 0C/32F, all new growth can be destroyed. If it is a wet cold and temps only drop below 0C/32F during the night for an hour or so, they are probably ok. But minimum ground temperatures are often different from normal night temperatures. A prediction may say it will be 2C/35.5F and then just as dawn is about the start, the clouds may clear up and your local ground temps may drop to -4C/25F, damaging the new growth.