DeWitt, IA 52736 Frost Dates
When can you plant in DeWitt, IA?
The last spring frost here typically falls around 04/22, about 237 days from today. The first fall frost typically arrives around 10/16, about 175 frost-free days later.
Zone 5b (-15 to -10°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 DeWitt, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in DeWitt before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around DeWitt's last frost
04/22 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How DeWitt compares
DeWitt's growing season runs about 175 days, ranking 26,874 of 40,283 US ZIP codes measured here, longest to shortest. Within IA, it ranks 172 of 1,042.
Learn more
the frost range covers how to read the range around DeWitt's dates instead of trusting one. local microclimates covers what one yard in DeWitt can differ from the 52736 normal.