Ulm, AR 72170 Frost Dates
When can you plant in Ulm, AR?
Around 03/11 is the usual last spring frost, about 195 days away. The first fall frost typically arrives around 11/17, about 250 frost-free days later.
Ulm sits in USDA Zone 8b (15 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 12 weeks of growing season left in Ulm before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/11 isn't a guarantee
03/11 is the middle of 30 years of NOAA records, not a promise. Plant by 02/21 and you're betting against frost in roughly 9 years out of 10. 03/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ulm compares
At roughly 250 frost-free days, Ulm places 7,600 of 40,283 ZIP codes in this dataset. Within AR, it ranks 9 of 687.
Learn more
zone vs. frost date covers why Zone 8b and Ulm's frost date answer different questions. the frost range covers how to read the range around Ulm's dates instead of trusting one.