Frost Dates for 37865 — Seymour, Tennessee

Half of springs at Sevierville, TN see their last 32°F night by April 6; only one in ten is past it by March 23, and one in ten still has one after April 21. Planting tender crops after April 11 leaves a 30% risk of a frost on them, after April 16 20%, and after April 21 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 78% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 29 in half of years, as early as October 16 one year in ten, and holds off past November 11 one year in ten. A hard freeze of 28°F follows 9 days later, around November 7; in spring the one-in-ten date for 28°F is April 9, 12 days before the 32°F one. The freeze-free season lasts 205 days in a typical year, longer than at 53% of the 144 Tennessee stations; it reaches 223 days one year in ten and falls short of 185 one year in ten. On average 86 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 13 days longer, to about April 19, and return around October 21. Severe cold of 16°F or below comes in 98% of winters, usually between December 25 and February 8.

July is the warmest month at Sevierville, TN, averaging 90°F by day and 67°F at night; January is the coldest at 49°F and 27°F. A freezing night is all but certain in every month from November 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 71% of years.

Warmth for growing adds up to 4,551 growing degree days a year (base 50°F), more than at 61% of the 144 Tennessee stations. 38% of them (1,727) have built up by the end of June, and July adds the most, 879. Precipitation totals 49.0 inches a year, most in December (4.9") and least in October (2.9"); May to September bring 41% of it.

The nearest other station, Knoxville Exp Stn, TN, 12 miles west of Seymour, has a last frost 5 days later (April 11), a first frost 1 day earlier (October 28), a season 7 days shorter.

The first measurable snow (0.1 inch or more) in Seymour usually arrives around December 30, and the last of the season around February 22. Those are the middle dates across the winters of 1991–2020 at Knoxville Mcghee Tyson Airport, TN, 13.7 miles away: half of years saw snow earlier, half later. Snow fell in 96% of those winters. The last 32°F night of spring typically comes 43 days after the last snow.

ZIP 37865 is 10 miles from Sevierville, TN, which stands at 899 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 37876 (Sevierville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37865 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.