Natural Bridge, AL 35577 Frost Dates
35577, near Natural Bridge, AL: the frost window
Typically, the last spring freeze lands around 03/29, roughly 213 days out. Fall's first freeze usually shows up around 11/09, roughly 228 days after the last spring frost.
Natural Bridge sits in USDA Zone 7b (5 to 10°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
Natural Bridge'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.
Why 03/29 isn't a guarantee
03/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/16 and only about 1 year in 10 sees frost after that.
Natural Bridge against the rest of the dataset
Natural Bridge's growing season runs about 228 days, ranking 10,936 of 40,283 US ZIP codes measured here, longest to shortest. Within AL, it ranks 579 of 809.
Learn more
Two guides worth reading on 35577: zone vs. frost date, on why Zone 7b and Natural Bridge's frost date answer different questions, and the frost range, on how to read the range around Natural Bridge's dates instead of trusting one.