Allerton, IA 50008 Frost Dates
When can you plant in Allerton, IA?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. The first fall frost typically arrives around 10/19, about 178 frost-free days later.
Zone 5b (-15 to -10°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 Allerton, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Allerton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Allerton's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Allerton compares
Allerton's growing season runs about 178 days, ranking 25,884 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 117 of 1,042.
Learn more
the frost range covers how to read the range around Allerton's dates instead of trusting one. local microclimates covers what one yard in Allerton can differ from the 50008 normal.