Middleton, ID 83644 Frost Dates
Frost dates for Middleton, ID, ZIP 83644
Around 04/29 is the usual last spring frost, about 244 days away. The first fall frost typically arrives around 10/13, about 164 frost-free days later.
Middleton sits in USDA Zone 7a (0 to 5°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 7a around Middleton has about 7 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 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Middleton compares
About 164 days separate Middleton's last and first frost, putting it 30,878 of 40,283 ZIP codes nationally. Within ID, it ranks 76 of 320.
Learn more
zone vs. frost date explains why Zone 7a and Middleton's frost date answer different questions, and the frost range explains how to read the range around Middleton's dates instead of trusting one.