Oldham, SD 57051 Frost Dates
When can you plant in Oldham, SD?
Typically, the last spring freeze lands around 05/03, roughly 248 days out. The first fall frost typically arrives around 10/02, about 151 frost-free days later.
Oldham sits in USDA Zone 4b (-25 to -20°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
About 5 weeks of growing season left in Oldham before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oldham compares
Oldham's growing season runs about 151 days, ranking 35,194 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 162 of 378.
Learn more
the frost range covers how to read the range around Oldham's dates instead of trusting one. local microclimates covers what one yard in Oldham can differ from the 57051 normal.