Southern most sightings in the lower forty eight states of hemiboreal or subarctic trees and shrubs? (growing, subtropical)

[Isleofpalms85]

What has been the furthest south in the lower forty eight states that you have seen hemiboreal or subarctic species of trees, shrubs, or flowers?

I personally have noted that there are few, if any spruce or fir trees growing in Fort Worth Texas. I have noted recently that certain types of spruce and fir trees are starting to decline in central Indiana, but whether that is due to climate change or soil type is unknown to me. So are there say, red spruce or balsam fir trees growing in what many people would consider subtropical or at the very least warm temperate climates? Please discuss