Lebanon, SD 57455 Frost Dates
When can you plant in Lebanon, SD?
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 09/29, about 138 frost-free days later.
Lebanon 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 Lebanon 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
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lebanon compares
At roughly 138 frost-free days, Lebanon places 37,491 of 40,283 ZIP codes in this dataset. Within SD, it ranks 338 of 378.
Learn more
local microclimates covers what one yard in Lebanon can differ from the 57455 normal. zone vs. frost date covers why Zone 4b and Lebanon's frost date answer different questions.