Onaway, ID 83857 Frost Dates
83857, near Onaway, ID: the frost window
The last spring frost here typically falls around 05/15, about 260 days from today. Fall's first freeze usually shows up around 09/21, roughly 126 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Onaway, not a forecast for this year.
Stretching the season past the first frost
Onaway's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Onaway's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/02 and only about 1 year in 10 sees frost after that.
Onaway against the rest of the dataset
Onaway's growing season runs about 126 days, ranking 38,723 of 40,283 US ZIP codes measured here, longest to shortest. Within ID, it ranks 195 of 320.
Learn more
Two guides worth reading on 83857: the frost range, on how to read the range around Onaway's dates instead of trusting one, and local microclimates, on what one yard in Onaway can differ from the 83857 normal.