Sumpter, OR 97877 Frost Dates
97877, near Sumpter, OR: the frost window
The NOAA station nearest to 97877 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 6b (-5 to 0°F average annual minimum).
Sumpter against the rest of the dataset
Sumpter's growing season runs about 74 days, ranking 40,099 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 443 of 463.
Learn more
Two guides worth reading on 97877: the methodology, on exactly which NOAA and USDA figures feed 97877's numbers, and zone vs. frost date, on why Zone 6b and Sumpter's frost date answer different questions.