Philadelphia, TN 37846 Frost Dates
37846, near Philadelphia, TN: the frost window
The last spring frost here typically falls around 04/03, about 218 days from today. Fall's first freeze usually shows up around 11/04, roughly 215 days after the last spring frost.
Philadelphia 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
Philadelphia'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.
The actual range around Philadelphia's last frost
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Philadelphia against the rest of the dataset
At roughly 215 frost-free days, Philadelphia places 14,164 of 40,283 ZIP codes in this dataset. Within TN, it ranks 237 of 770.
Learn more
Two guides worth reading on 37846: local microclimates, on what one yard in Philadelphia can differ from the 37846 normal, and zone vs. frost date, on why Zone 7b and Philadelphia's frost date answer different questions.