Cushing, IA 51018 Frost Dates
Frost dates for Cushing, IA, ZIP 51018
Typically, the last spring freeze lands around 04/30, roughly 245 days out. The first fall frost typically arrives around 10/09, about 162 frost-free days later.
Zone 5a (-20 to -15°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 Cushing, not a forecast for this year.
What to do before the first frost
Zone 5a around Cushing 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.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cushing compares
At roughly 162 frost-free days, Cushing places 31,869 of 40,283 ZIP codes in this dataset. Within IA, it ranks 730 of 1,042.
Learn more
local microclimates explains what one yard in Cushing can differ from the 51018 normal, and zone vs. frost date explains why Zone 5a and Cushing's frost date answer different questions.