Lisbon, IA 52253 Frost Dates
Frost dates for Lisbon, IA, ZIP 52253
Typically, the last spring freeze lands around 04/27, roughly 242 days out. The first fall frost typically arrives around 10/13, about 170 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 Lisbon, not a forecast for this year.
What to do before the first frost
Zone 5a around Lisbon has about 7 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. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lisbon compares
At roughly 170 frost-free days, Lisbon places 29,046 of 40,283 ZIP codes in this dataset. Within IA, it ranks 300 of 1,042.
Learn more
zone vs. frost date explains why Zone 5a and Lisbon's frost date answer different questions, and the frost range explains how to read the range around Lisbon's dates instead of trusting one.