Frost Dates for 37807 — Maynardville, Tennessee

Half of springs at Norris, TN see their last 32°F night by April 22; only one in ten is past it by April 6, and one in ten still has one after May 9. Planting tender crops after April 30 leaves a 30% risk of a frost on them, after May 2 20%, and after May 9 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 34% of the 144 Tennessee stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 25 in half of years, as early as October 11 one year in ten, and holds off past November 6 one year in ten. A hard freeze of 28°F follows 9 days later, around November 3; in spring the one-in-ten date for 28°F is April 30, 9 days before the 32°F one. The freeze-free season lasts 184 days in a typical year, shorter than at 91% of the 144 Tennessee stations; it reaches 205 days one year in ten and falls short of 161 one year in ten. On average 101 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 10 days longer, to about May 2, and return around October 16. Severe cold of 16°F or below comes in 99% of winters, usually between December 21 and February 21.

July is the warmest month at Norris, TN, averaging 85°F by day and 63°F at night; January is the coldest at 44°F and 25°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 26% of years.

Warmth for growing adds up to 3,691 growing degree days a year (base 50°F), fewer than at 90% of the 144 Tennessee stations. 37% of them (1,370) have built up by the end of June, and July adds the most, 752. Precipitation totals 57.9 inches a year, most in April (5.8") and least in October (3.4"); May to September bring 40% of it.

The nearest other station, Tazewell, TN, 21 miles northeast of Maynardville and 255 feet higher, has a last frost 1 day later (April 23), a first frost 6 days earlier (October 19), a season 7 days shorter.

The first measurable snow (0.1 inch or more) in Maynardville usually arrives around December 26, and the last of the season around March 4. Those are the middle dates across the winters of 1991–2020 at Tazewell, TN, 20.9 miles away: half of years saw snow earlier, half later. Snow fell in 97% of those winters. The last 32°F night of spring typically comes 49 days after the last snow.

ZIP 37807 is 13 miles from Norris, TN, which stands at 1,110 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 9 other ZIP codes share the station; its figures are presented in full for 37766 (La Follette). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37807 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.