Draper, SD 57531 Frost Dates
Frost dates for Draper, SD, ZIP 57531
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/07, about 154 frost-free days later.
The USDA Plant Hardiness Zone Map puts Draper 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 Draper 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.
The actual range around Draper's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/23 and you're betting against frost in roughly 9 years out of 10. 05/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Draper compares
About 154 days separate Draper's last and first frost, putting it 34,481 of 40,283 ZIP codes nationally. Within SD, it ranks 106 of 378.
Learn more
zone vs. frost date explains why Zone 5a and Draper's frost date answer different questions, and the frost range explains how to read the range around Draper's dates instead of trusting one.