Sulphur Rock, AR 72503 Frost Dates
72503, near Sulphur Rock, AR: the frost window
Typically, the last spring freeze lands around 03/30, roughly 214 days out. Fall's first freeze usually shows up around 11/05, roughly 221 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Sulphur Rock in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Sulphur Rock's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
03/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/14 and only about 1 year in 10 sees frost after that.
Sulphur Rock against the rest of the dataset
At roughly 221 frost-free days, Sulphur Rock places 12,554 of 40,283 ZIP codes in this dataset. Within AR, it ranks 407 of 687.
Learn more
Two guides worth reading on 72503: local microclimates, on what one yard in Sulphur Rock can differ from the 72503 normal, and zone vs. frost date, on why Zone 7b and Sulphur Rock's frost date answer different questions.