Leon, IA 50144 Frost Dates
Frost dates for Leon, IA, ZIP 50144
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/08, about 161 frost-free days later.
Leon 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 Leon 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 Leon's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 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 Leon compares
Leon's growing season runs about 161 days, ranking 32,074 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 748 of 1,042.
Learn more
the frost range explains how to read the range around Leon's dates instead of trusting one, and local microclimates explains what one yard in Leon can differ from the 50144 normal.