Peach trees tend to be very hardy and shrug off winter effects. I have peach trees that are showing more life right now that it's cold and raining so hard I can't hear myself think versus earlier in the year when it was warm and optimally humid.
I have not had them bloom or fruit this late but I did have an apple tree that I transplanted late, bloom in december. It was an unusually warm period during december followed by a sharp drop in temps during the final following months of the winter season.
My peach/nectarine group is still maturing to the point where it can fruit.