College Springs, IA 51637 Frost Dates
When can you plant in College Springs, IA?
Around 04/25 is the usual last spring frost, about 240 days away. The first fall frost typically arrives around 10/11, about 168 frost-free days later.
The USDA Plant Hardiness Zone Map puts College Springs in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 6 weeks of growing season left in College Springs before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/11 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How College Springs compares
At roughly 168 frost-free days, College Springs places 29,798 of 40,283 ZIP codes in this dataset. Within IA, it ranks 398 of 1,042.
Learn more
zone vs. frost date covers why Zone 5b and College Springs's frost date answer different questions. the frost range covers how to read the range around College Springs's dates instead of trusting one.