The answer of course, is it depends. On the source of the genetics, and how much different your zone is.

Sometimes I had a LOT of problems with perennials just melting if they came from NY at their proper planting time, when it's like 90 here and sweltering.

Only you can determine this, I'd say. Ideally get plants grown in (and genetically from) your local area. I know this is impossible in some cases.

im not to clear.. on the premise ...

first.. i wonder what the zone of a nursery.. matters to a tree ... are we just talking about transport stresses ...

or.. second ... are we actually talking about min winter temps.. which is what zone basically is????

there are many more variables than min winter temp .. when moving south.. warmer zones ... that would be much bigger variables ... all things considered ...

and finally.. you speak of natives .. and i wonder native to where?? .... where the nursery is.. or where you are ... or both???

properly shipped dormant.. and native to your area ... i dont see that there is any real problem.. subject to the above ??? ..

ken

ps: how far.. miles.. are we talking ...2 zones could be 50 miles.. of a thousand ... how about two city names.. or some such

Southern Quebec to just south of Windsor Detroit. Trees are native to both. I assumed zone pushing was more south to north with winter survivability. But if the trees are found in both places then they aare bracketed in happy conditions I hope

Summer daytime & nighttime temperatures, precipitation, humidity aren't so dissimilar between those two locations that a species native to both areas would have any issues.

I don't see the difference in winter conditions being a factor in this case.

Shouldn't be a problem...unless we are dealing with a species borderline tolerant of your summer heat and droughts and the seeds are locally sourced.

A bigger problem occurs when you are ordering from a nursery south of you at the edges of the season...the trees may be leafed out at a time they should be dormant where you are.