I’m not Olpea, but this old thread: Peach bud hardiness? Clear as mud? indicates that its dependent on how dormant the buds are. It sounds like the cutoff is -5F but if the weather has been cold and they’re dormant you can have lower temps and be just fine. Olpea mentioned getting worried around -10F.
Last year I think the bad problem was spring frosts in my area and in KS. We had a mild March then a few serious freezes through May. This thread: 2023 Peach Evaluations gives a more complete story about temp drop and late freeze. =(