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Southern United States in North Carolina - we usually see them mid-February.
I'll go out and check our beds and see if they look like they are close.

You are a bit more south than I am (the Netherlands). I would expect them to show up earlier where you are...

It may the varieties you have are slightly more cold-adapted. The first textual reference I can find to daffodils in North Carolina are in 1759 - http://www.southernedition.com/DaffodilsinEarlySouthernGardens.html