Audubon, IA 50025 Frost Dates
Frost dates for Audubon, IA, ZIP 50025
Around 04/27 is the usual last spring frost, about 242 days away. The first fall frost typically arrives around 10/09, about 165 frost-free days later.
The USDA Plant Hardiness Zone Map puts Audubon 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 Audubon 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.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Audubon compares
At roughly 165 frost-free days, Audubon places 30,606 of 40,283 ZIP codes in this dataset. Within IA, it ranks 506 of 1,042.
Learn more
local microclimates explains what one yard in Audubon can differ from the 50025 normal, and zone vs. frost date explains why Zone 5a and Audubon's frost date answer different questions.