Orofino, ID 83520 Frost Dates
83520, near Orofino, ID: the frost window
The last spring frost here typically falls around 04/20, about 235 days from today. Fall's first freeze usually shows up around 10/20, roughly 182 days after the last spring frost.
Zone 7a (0 to 5°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 Orofino, not a forecast for this year.
Stretching the season past the first frost
Orofino's growing season runs out in roughly 8 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 Orofino's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
Orofino against the rest of the dataset
About 182 days separate Orofino's last and first frost, putting it 24,161 of 40,283 ZIP codes nationally. Within ID, it ranks 6 of 320.
Learn more
Two guides worth reading on 83520: local microclimates, on what one yard in Orofino can differ from the 83520 normal, and zone vs. frost date, on why Zone 7a and Orofino's frost date answer different questions.