Springbrook, IA 52074 Frost Dates
Frost dates for Springbrook, IA, ZIP 52074
Typically, the last spring freeze lands around 04/25, roughly 240 days out. The first fall frost typically arrives around 10/16, about 172 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 Springbrook, not a forecast for this year.
What to do before the first frost
Zone 5a around Springbrook 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.
The actual range around Springbrook's last frost
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/10 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Springbrook compares
At roughly 172 frost-free days, Springbrook places 28,530 of 40,283 ZIP codes in this dataset. Within IA, it ranks 278 of 1,042.
Learn more
local microclimates explains what one yard in Springbrook can differ from the 52074 normal, and zone vs. frost date explains why Zone 5a and Springbrook's frost date answer different questions.