Spillville, IA 52168 Frost Dates
Frost dates for Spillville, IA, ZIP 52168
Around 05/03 is the usual last spring frost, about 248 days away. The first fall frost typically arrives around 10/07, about 157 frost-free days later.
Spillville sits in USDA Zone 4b (-25 to -20°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 4b around Spillville 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 Spillville's last frost
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 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 Spillville compares
Spillville's growing season runs about 157 days, ranking 33,442 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 849 of 1,042.
Learn more
local microclimates explains what one yard in Spillville can differ from the 52168 normal, and zone vs. frost date explains why Zone 4b and Spillville's frost date answer different questions.