Summit, MS 39666 Frost Dates
39666, near Summit, MS: the frost window
Around 03/11 is the usual last spring frost, about 195 days away. Fall's first freeze usually shows up around 11/18, roughly 253 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Summit in Zone 8b (15 to 20°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Summit's growing season runs out in roughly 12 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 Summit's last frost
03/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/02 and only about 1 year in 10 sees frost after that.
Summit against the rest of the dataset
Summit's growing season runs about 253 days, ranking 7,163 of 40,283 US ZIP codes measured here, longest to shortest. Within MS, it ranks 115 of 523.
Learn more
Two guides worth reading on 39666: local microclimates, on what one yard in Summit can differ from the 39666 normal, and zone vs. frost date, on why Zone 8b and Summit's frost date answer different questions.