I've never had them NOT winter over, unless there was either severe frost heaving or the squirrels dug them up and exposed the roots. This info is based on gardens in Rochester NY, Cincinnati, Pittsburgh, and zone 7 Northern VA.
FWIW, my alpine strawberries frequently sprout in early fall from the current year's dropped berries (the ones which got mostly hollowed out by slugs), so freezing does not seem to be necessary. They ARE slow to germinate, however.
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