Sunbright, TN 37872 Frost Dates
Sunbright, TN: when does the frost end?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/17, roughly 177 days after the last spring frost.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Sunbright, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Sunbright's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Sunbright against the rest of the dataset
Sunbright's growing season runs about 177 days, ranking 26,222 of 40,283 US ZIP codes measured here, longest to shortest. Within TN, it ranks 752 of 770.
Learn more
Before leaning on 37872's figures: zone vs. frost date explains why Zone 7a and Sunbright's frost date answer different questions, while the frost range explains how to read the range around Sunbright's dates instead of trusting one.