Hamburg, AR 71646 Frost Dates
71646, near Hamburg, AR: the frost window
Typically, the last spring freeze lands around 03/18, roughly 202 days out. Fall's first freeze usually shows up around 11/11, roughly 238 days after the last spring frost.
Hamburg 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.
Stretching the season past the first frost
Hamburg's growing season runs out in roughly 11 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
03/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/06 and only about 1 year in 10 sees frost after that.
Hamburg against the rest of the dataset
Hamburg's growing season runs about 238 days, ranking 8,980 of 40,283 US ZIP codes measured here, longest to shortest. Within AR, it ranks 107 of 687.
Learn more
Two guides worth reading on 71646: the frost range, on how to read the range around Hamburg's dates instead of trusting one, and local microclimates, on what one yard in Hamburg can differ from the 71646 normal.