Aberdeen, SD 57401 Frost Dates
Frost dates for Aberdeen, SD, ZIP 57401
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 09/29, about 144 frost-free days later.
Zone 4a (-30 to -25°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 Aberdeen, not a forecast for this year.
What to do before the first frost
Zone 4a around Aberdeen 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.
How much risk comes with planting early here
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Aberdeen compares
At roughly 144 frost-free days, Aberdeen places 36,339 of 40,283 ZIP codes in this dataset. Within SD, it ranks 255 of 378.
Learn more
the frost range explains how to read the range around Aberdeen's dates instead of trusting one, and local microclimates explains what one yard in Aberdeen can differ from the 57401 normal.