Frost Dates for 37843 — Parrottsville, Tennessee

Half of springs at Newport 1 NW, TN see their last 32°F night by April 7; only one in ten is past it by March 23, and one in ten still has one after April 23. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 18 20%, and after April 23 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 53% 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 17 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 8 days later, around November 6; in spring the one-in-ten date for 28°F is April 12, 11 days before the 32°F one. The freeze-free season lasts 203 days in a typical year, shorter than at 52% of the 144 Tennessee stations; it reaches 222 days one year in ten and falls short of 184 one year in ten. On average 85 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 21, and return around October 21. Severe cold of 16°F or below comes in 98% of winters, usually between December 26 and February 5.

July is the warmest month at Newport 1 NW, TN, averaging 88°F by day and 67°F at night; January is the coldest at 49°F and 28°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 73% of years.

Warmth for growing adds up to 4,413 growing degree days a year (base 50°F), fewer than at 56% of the 144 Tennessee stations. 38% of them (1,682) have built up by the end of June, and July adds the most, 856. Precipitation totals 46.7 inches a year, most in July (4.9") and least in October (2.4"); May to September bring 43% of it.

The nearest other station, Greeneville Exp Stn, TN, 13 miles northeast of Parrottsville and 284 feet higher, has a last frost 13 days later (April 20), a first frost 7 days earlier (October 22), a season 18 days shorter.

The first measurable snow (0.1 inch or more) in Parrottsville usually arrives around December 25, and the last of the season around February 27. Those are the middle dates across the winters of 1991–2020 at Greeneville Exp Stn, TN, 13.3 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 39 days after the last snow.

ZIP 37843 is 9 miles from Newport 1 NW, TN, which stands at 1,036 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 37821 (Newport). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37843 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.