Osburn, ID 83849 Frost Dates
Frost dates for Osburn, ID, ZIP 83849
The last spring frost here typically falls around 05/05, about 250 days from today. The first fall frost typically arrives around 10/02, about 149 frost-free days later.
Osburn sits in USDA Zone 6b (-5 to 0°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
Zone 6b around Osburn has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/05 isn't a guarantee
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Osburn compares
At roughly 149 frost-free days, Osburn places 35,530 of 40,283 ZIP codes in this dataset. Within ID, it ranks 118 of 320.
Learn more
zone vs. frost date explains why Zone 6b and Osburn's frost date answer different questions, and the frost range explains how to read the range around Osburn's dates instead of trusting one.