There are 13 planting zones in the U.S., each are divided into two segments, a and b, with 5 degrees separating the two segments. We are now Zone 5a but not Zone 5B.  Zone 5a’s average annual extreme low temperature, between years 1991 and 2020, is -20 to -15 with Zone 5b average low temperatures … Continue reading Are We or Are We Not a Zone 5?