Iona, ID 83401 Frost Dates
When can you plant in Iona, ID?
The last spring frost here typically falls around 05/09, about 254 days from today. The first fall frost typically arrives around 10/01, about 142 frost-free days later.
Iona sits in USDA Zone 5b (-15 to -10°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.
What to do before the first frost
About 5 weeks of growing season left in Iona before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Iona's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 06/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Iona compares
At roughly 142 frost-free days, Iona places 36,737 of 40,283 ZIP codes in this dataset. Within ID, it ranks 144 of 320.
Learn more
the frost range covers how to read the range around Iona's dates instead of trusting one. local microclimates covers what one yard in Iona can differ from the 83401 normal.