Erwin, TN 37657 Frost Dates
37657, near Erwin, TN: the frost window
Typically, the last spring freeze lands around 04/28, roughly 243 days out. Fall's first freeze usually shows up around 10/18, roughly 173 days after the last spring frost.
Erwin sits in USDA Zone 7a (0 to 5°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
Erwin's growing season runs out in roughly 7 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
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Erwin against the rest of the dataset
Erwin's growing season runs about 173 days, ranking 27,854 of 40,283 US ZIP codes measured here, longest to shortest. Within TN, it ranks 763 of 770.
Learn more
Two guides worth reading on 37657: the frost range, on how to read the range around Erwin's dates instead of trusting one, and local microclimates, on what one yard in Erwin can differ from the 37657 normal.