La Bolt, SD 57246 Frost Dates
Frost dates for La Bolt, SD, ZIP 57246
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/04, about 153 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 La Bolt, not a forecast for this year.
What to do before the first frost
Zone 4b around La Bolt has about 5 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
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 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 La Bolt compares
La Bolt's growing season runs about 153 days, ranking 34,663 of 40,283 US ZIP codes measured here, longest to shortest. Within SD, it ranks 130 of 378.
Learn more
local microclimates explains what one yard in La Bolt can differ from the 57246 normal, and zone vs. frost date explains why Zone 4b and La Bolt's frost date answer different questions.