Your hives should be fine as long as they have food available near the cluster, don't know if you installed the bees on foundation, foundationless, or drawn comb. I just installed 10 packages of bees this week also, put them into a medium depth box with foundationless frames, except for one drawn comb of honey or syrup in each hive. I put an inverted feeder jar of syrup over the inner cover hole today and reduced the hive entrance down to 1 inch wide. We are expecting lows in the mid-30's tonight and tommorow night. They should be snug as a bug in a rug.
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