The biggest problem are the roots, which will suffer near those temperatures. Putting the pots on the ground, covered with mulch helps (Or, if it snows, a nice snow blanket will raise the temperature to near freezing). If you do this in a garage / shed you win another few degrees. If you still do get temps that far down in the rootzone, a frost-protection cable burried in sand on top of which you place the pot could help. Add a time for the coldest hours of the night? And/or build a coldframe for your trees, which is what I hear many people in true cold climates do.
The following user(s) said Thank You: Si Guy
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