Irmo, SC 29002 Frost Dates
When can you plant in Irmo, SC?
The last spring frost here typically falls around 03/25, about 209 days from today. The first fall frost typically arrives around 11/07, about 229 frost-free days later.
The USDA Plant Hardiness Zone Map puts Irmo in Zone 8b (15 to 20°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
About 10 weeks of growing season left in Irmo before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/25 isn't a guarantee
03/25 is the middle of 30 years of NOAA records, not a promise. Plant by 03/04 and you're betting against frost in roughly 9 years out of 10. 04/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Irmo compares
At roughly 229 frost-free days, Irmo places 10,559 of 40,283 ZIP codes in this dataset. Within SC, it ranks 333 of 519.
Learn more
the frost range covers how to read the range around Irmo's dates instead of trusting one. local microclimates covers what one yard in Irmo can differ from the 29002 normal.