Donnelly, ID 83635 Frost Dates
Donnelly, ID: when does the frost end?
The last spring frost here typically falls around 05/21, about 266 days from today. Fall's first freeze usually shows up around 09/18, roughly 115 days after the last spring frost.
Donnelly sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 3 weeks until Donnelly's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/13 and only about 1 year in 10 sees frost after that.
Donnelly against the rest of the dataset
About 115 days separate Donnelly's last and first frost, putting it 39,337 of 40,283 ZIP codes nationally. Within ID, it ranks 229 of 320.
Learn more
Before leaning on 83635's figures: local microclimates explains what one yard in Donnelly can differ from the 83635 normal, while zone vs. frost date explains why Zone 5a and Donnelly's frost date answer different questions.