Andover, SD 57422 Frost Dates
When can you plant in Andover, SD?
The last spring frost here typically falls around 05/06, about 251 days from today. The first fall frost typically arrives around 10/04, about 150 frost-free days later.
Zone 4b (-25 to -20°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 Andover, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Andover before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/06 isn't a guarantee
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/22 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 Andover compares
About 150 days separate Andover's last and first frost, putting it 35,459 of 40,283 ZIP codes nationally. Within SD, it ranks 178 of 378.
Learn more
the frost range covers how to read the range around Andover's dates instead of trusting one. local microclimates covers what one yard in Andover can differ from the 57422 normal.