Dallas, SD 57529 Frost Dates
Frost dates for Dallas, SD, ZIP 57529
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/10, about 162 frost-free days later.
The USDA Plant Hardiness Zone Map puts Dallas in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 5a around Dallas has about 6 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.
Why 05/01 isn't a guarantee
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 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 Dallas compares
At roughly 162 frost-free days, Dallas places 31,899 of 40,283 ZIP codes in this dataset. Within SD, it ranks 27 of 378.
Learn more
local microclimates explains what one yard in Dallas can differ from the 57529 normal, and zone vs. frost date explains why Zone 5a and Dallas's frost date answer different questions.