Irwin, ID 83428 Frost Dates
83428, near Irwin, ID: the frost window
The NOAA station nearest to 83428 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 6a (-10 to -5°F average annual minimum).
Irwin against the rest of the dataset
Irwin's growing season runs about 69 days, ranking 40,133 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 301 of 320.
Learn more
Two guides worth reading on 83428: local microclimates, on what one yard in Irwin can differ from the 83428 normal, and the methodology, on exactly which NOAA and USDA figures feed 83428's numbers.