Keswick, IA 50136 Frost Dates
Frost dates for Keswick, IA, ZIP 50136
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/09, about 164 frost-free days later.
Keswick sits in USDA Zone 5b (-15 to -10°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 5b around Keswick 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 Keswick's last frost
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/14 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Keswick compares
At roughly 164 frost-free days, Keswick places 31,204 of 40,283 ZIP codes in this dataset. Within IA, it ranks 630 of 1,042.
Learn more
local microclimates explains what one yard in Keswick can differ from the 50136 normal, and zone vs. frost date explains why Zone 5b and Keswick's frost date answer different questions.