Humeston, IA 50123 Frost Dates
Frost dates for Humeston, IA, ZIP 50123
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/08, about 161 frost-free days later.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Humeston, not a forecast for this year.
What to do before the first frost
Zone 5b around Humeston has about 6 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 Humeston's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Humeston compares
Humeston's growing season runs about 161 days, ranking 32,139 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 750 of 1,042.
Learn more
zone vs. frost date explains why Zone 5b and Humeston's frost date answer different questions, and the frost range explains how to read the range around Humeston's dates instead of trusting one.