Masonville, IA 50654 Frost Dates
Frost dates for Masonville, IA, ZIP 50654
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 10/04, about 154 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 Masonville, not a forecast for this year.
What to do before the first frost
Zone 5a around Masonville has about 5 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 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Masonville compares
About 154 days separate Masonville's last and first frost, putting it 34,473 of 40,283 ZIP codes nationally. Within IA, it ranks 915 of 1,042.
Learn more
zone vs. frost date explains why Zone 5a and Masonville's frost date answer different questions, and the frost range explains how to read the range around Masonville's dates instead of trusting one.