Some of the leaves on my miniature roses are turning a dark red color. Should I be concerned or is this normal

I'm in zone 7b and we have had a freak frost for the past couple nights. I didn't know if this had anything to do with them doing this. They are still producing flowers, so I can just assume that they are fine, but I want to make sure.

Some of the leaves on my miniature roses are turning a dark red color. Should I be concerned or is this normal
dark red should be on the newer growth to be normal... unless the color of the rose is a deep dark red... then a red leaf is okay, too....

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