Inwood, IA 51240 Frost Dates
Frost dates for Inwood, IA, ZIP 51240
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/02, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts Inwood 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 Inwood 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 Inwood's last frost
05/02 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. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Inwood compares
At roughly 151 frost-free days, Inwood places 35,096 of 40,283 ZIP codes in this dataset. Within IA, it ranks 972 of 1,042.
Learn more
local microclimates explains what one yard in Inwood can differ from the 51240 normal, and zone vs. frost date explains why Zone 5a and Inwood's frost date answer different questions.