Crooks, SD 57109 Frost Dates
Frost dates for Crooks, SD, ZIP 57109
The last spring frost here typically falls around 05/01, about 246 days from today. The first fall frost typically arrives around 10/06, about 157 frost-free days later.
Zone 5a (-20 to -15°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 Crooks, not a forecast for this year.
What to do before the first frost
Zone 5a around Crooks 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.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Crooks compares
At roughly 157 frost-free days, Crooks places 33,359 of 40,283 ZIP codes in this dataset. Within SD, it ranks 71 of 378.
Learn more
zone vs. frost date explains why Zone 5a and Crooks's frost date answer different questions, and the frost range explains how to read the range around Crooks's dates instead of trusting one.