Protivin, IA 52163 Frost Dates
Frost dates for Protivin, IA, ZIP 52163
Typically, the last spring freeze lands around 05/08, roughly 253 days out. The first fall frost typically arrives around 10/01, about 147 frost-free days later.
The USDA Plant Hardiness Zone Map puts Protivin in Zone 4b (-25 to -20°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
Zone 4b around Protivin 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.
The actual range around Protivin's last frost
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 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 Protivin compares
About 147 days separate Protivin's last and first frost, putting it 35,980 of 40,283 ZIP codes nationally. Within IA, it ranks 1,028 of 1,042.
Learn more
zone vs. frost date explains why Zone 4b and Protivin's frost date answer different questions, and the frost range explains how to read the range around Protivin's dates instead of trusting one.