Outdoor Frost Issues

I have an op going in the midwest right now and we had a frost last night. Is one frost going to be an issue? It should be the last one of the season. I have 6 blueberry and 3 GDP that have been growing for 3 weeks indoor and this has been their first week outside if that matters. Any help would be appreciated.

If they are seedlings if probably hurt em bad... cover em with a pillowcase or a bucket with holes when theyre that small frost can rlly damage the fragile root system. Howd they do man?