I can't really answer this question to your satisfaction.
It doesn't snow here, but it does get very cold sometimes. There can be light frost in the early morning that melts away during the course of the day in the winter here, but that's not the same as snow.
If it snows where you live, you just might have to find someone who lives in an area like yours and see how they grow their Bletilla striata during the winter.
All I know is that they're frost hardy. How frost hardy is a totally different subject.
I grow mine on my porch, potted without mulch.
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Philip
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