Concordia Oaks and Swamp / Bur Hybrids

I have had a few Swamp Bur Oaks die in Minnesota. Not sure if it’s the col snap last winter ? Drought ? I don’t know.

Should not be an issue for states like Iowa, Missouri, Illinois, etc…

Just thought I’d let you know. The ones I planted on hills or side hills are alive . These were in a bottom ?
What zone in Minnesota or area?
 
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