Eagle Butte, SD 57622 Frost Dates
When can you plant in Eagle Butte, SD?
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/04, about 148 frost-free days later.
Eagle Butte 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 Eagle Butte before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Eagle Butte compares
Eagle Butte's growing season runs about 148 days, ranking 35,738 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 198 of 378.
Learn more
zone vs. frost date covers why Zone 4b and Eagle Butte's frost date answer different questions. the frost range covers how to read the range around Eagle Butte's dates instead of trusting one.