Ririe, ID 83443 Frost Dates
When can you plant in Ririe, ID?
The last spring frost here typically falls around 05/09, about 254 days from today. The first fall frost typically arrives around 10/05, about 148 frost-free days later.
The USDA Plant Hardiness Zone Map puts Ririe in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 5 weeks of growing season left in Ririe before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
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. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ririe compares
At roughly 148 frost-free days, Ririe places 35,768 of 40,283 ZIP codes in this dataset. Within ID, it ranks 126 of 320.
Learn more
the frost range covers how to read the range around Ririe's dates instead of trusting one. local microclimates covers what one yard in Ririe can differ from the 83443 normal.