Biwabik, MN 55815 Frost Dates
Frost dates for Biwabik, MN, ZIP 55815
The NOAA station nearest to 55815 does not report a usable frost-date normal for either event, so no last-frost or first-frost figure is shown here. The USDA hardiness zone below is still real: Zone 4b (-25 to -20°F average annual minimum).
How Biwabik compares
About 83 days separate Biwabik's last and first frost, putting it 40,025 of 40,283 ZIP codes nationally. Within MN, it ranks 942 of 943.
Learn more
local microclimates explains what one yard in Biwabik can differ from the 55815 normal, and the methodology explains exactly which NOAA and USDA figures feed 55815's numbers.