Silverton, CO 81433 Frost Dates
Silverton, CO: when does the frost end?
The NOAA station nearest to 81433 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).
Silverton against the rest of the dataset
About 40 days separate Silverton's last and first frost, putting it 40,251 of 40,283 ZIP codes nationally. Within CO, it ranks 614 of 624.
Learn more
Before leaning on 81433's figures: local microclimates explains what one yard in Silverton can differ from the 81433 normal, while the methodology explains exactly which NOAA and USDA figures feed 81433's numbers.