Anamosa, IA 52205 Frost Dates
Frost dates for Anamosa, IA, ZIP 52205
Around 04/27 is the usual last spring frost, about 242 days away. 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 Anamosa, not a forecast for this year.
What to do before the first frost
Zone 5a around Anamosa 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 Anamosa compares
Anamosa's growing season runs about 170 days, ranking 28,977 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 297 of 1,042.
Learn more
the frost range explains how to read the range around Anamosa's dates instead of trusting one, and local microclimates explains what one yard in Anamosa can differ from the 52205 normal.