Delhi, IA 52223 Frost Dates
Frost dates for Delhi, IA, ZIP 52223
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/04, about 154 frost-free days later.
The USDA Plant Hardiness Zone Map puts Delhi in Zone 5a (-20 to -15°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 5a around Delhi 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.
How much risk comes with planting early here
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Delhi compares
About 154 days separate Delhi's last and first frost, putting it 34,421 of 40,283 ZIP codes nationally. Within IA, it ranks 905 of 1,042.
Learn more
zone vs. frost date explains why Zone 5a and Delhi's frost date answer different questions, and the frost range explains how to read the range around Delhi's dates instead of trusting one.