Timber Lake, SD 57657 Frost Dates
When can you plant in Timber Lake, SD?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. The first fall frost typically arrives around 09/30, about 141 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 Timber Lake, not a forecast for this year.
What to do before the first frost
About 5 weeks of growing season left in Timber Lake before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Timber Lake's last frost
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/29 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Timber Lake compares
About 141 days separate Timber Lake's last and first frost, putting it 36,963 of 40,283 ZIP codes nationally. Within SD, it ranks 296 of 378.
Learn more
zone vs. frost date covers why Zone 4b and Timber Lake's frost date answer different questions. the frost range covers how to read the range around Timber Lake's dates instead of trusting one.