Opal, WY 83101 Frost Dates
Opal, WY: when does the frost end?
The NOAA station nearest to 83101 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 5a (-20 to -15°F average annual minimum).
Opal against the rest of the dataset
About 69 days separate Opal's last and first frost, putting it 40,135 of 40,283 ZIP codes nationally. Within WY, it ranks 173 of 192.
Learn more
Before leaning on 83101's figures: zone vs. frost date explains why Zone 5a and Opal's frost date answer different questions, while local microclimates explains what one yard in Opal can differ from the 83101 normal.