Frost Dates for 37397 — Whitwell, Tennessee

Half of springs at Whitwell-Sequatchie Vly, TN see their last 32°F night by March 26; only one in ten is past it by March 6, and one in ten still has one after April 13. Planting tender crops after April 3 leaves a 30% risk of a frost on them, after April 7 20%, and after April 13 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 67% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 8 in half of years, as early as October 25 one year in ten, and holds off past November 29 one year in ten. A hard freeze of 28°F follows 16 days later, around November 24; in spring the one-in-ten date for 28°F is April 2, 11 days before the 32°F one. The freeze-free season lasts 228 days in a typical year, longer than at 97% of the 144 Tennessee stations; it reaches 254 days one year in ten and falls short of 203 one year in ten. On average 63 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 14 days longer, to about April 9, and return around October 28. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 85%.

July is the warmest month at Whitwell-Sequatchie Vly, TN, averaging 88°F by day and 68°F at night; January is the coldest at 49°F and 32°F. A freezing night is all but certain in every month from December to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 37% of years.

Warmth for growing adds up to 4,762 growing degree days a year (base 50°F), more than at 81% of the 144 Tennessee stations. 39% of them (1,845) have built up by the end of June, and July adds the most, 860. Precipitation totals 63.8 inches a year, most in December (6.8") and least in October (3.9"); May to September bring 38% of it.

The nearest other station, Soddy Daisy-Mowbray Mountain, TN, 15 miles east of Whitwell and 680 feet higher, has a last frost 12 days later (April 7), a first frost 10 days earlier (October 29), a season 25 days shorter.

The first measurable snow (0.1 inch or more) in Whitwell usually arrives around January 16, and the last of the season around February 8. Those are the middle dates across the winters of 1991–2020 at Whitwell-Sequatchie Vly, TN, 6.1 miles away: half of years saw snow earlier, half later. Snow fell in 76% of those winters. The last 32°F night of spring typically comes 46 days after the last snow.

ZIP 37397 is 6 miles from Whitwell-Sequatchie Vly, TN, which stands at 1,020 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 37327 (Dunlap). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37397 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.