Downtoearthdigs
Answered on April 21, 2017
If temperatures were below freezing, the fronds will freeze, as you found, though they generally can take brief dips in temperatures.
The plants themselves should be ok as they are hardy down to zone 3.
Just allow them some more time to see if they will send up new growth.
https://www.gardeningknowhow.com/ornamental/foliage/ferns/taking-care-of-outdoor-ferns.htm
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