Frost Dates for 37722 — Cosby, Tennessee

Half of springs at Waterville 2, NC see their last 32°F night by April 6; only one in ten is past it by March 20, and one in ten still has one after April 23. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 18 20%, and after April 23 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 November 1 in half of years, as early as October 20 one year in ten, and holds off past November 14 one year in ten. A hard freeze of 28°F follows 12 days later, around November 13; in spring the one-in-ten date for 28°F is April 8, 15 days before the 32°F one. The freeze-free season lasts 210 days in a typical year, longer than at 69% of the 144 Tennessee stations; it reaches 233 days one year in ten and falls short of 191 one year in ten. On average 78 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 20, and return around October 23. Severe cold of 16°F or below comes in 94% of winters, usually between January 3 and February 3.

July is the warmest month at Waterville 2, NC, averaging 86°F by day and 65°F at night; January is the coldest at 49°F and 29°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 65% of years.

Warmth for growing adds up to 4,148 growing degree days a year (base 50°F), fewer than at 73% of the 144 Tennessee stations. 38% of them (1,596) have built up by the end of June, and July adds the most, 795. Precipitation totals 53.9 inches a year, most in July (6.5") and least in October (2.7"); May to September bring 48% of it.

The nearest other station, Newport 1 NW, TN, 12 miles north of Cosby and 394 feet lower, has a last frost 1 day later (April 7), a first frost 3 days earlier (October 29), a season 7 days shorter.

The first measurable snow (0.1 inch or more) in Cosby usually arrives around January 26, and the last of the season around February 11. Those are the middle dates across the winters of 1991–2020 at Waterville 2, NC, 8.7 miles away: half of years saw snow earlier, half later. Snow fell in 77% of those winters. The last 32°F night of spring typically comes 54 days after the last snow.

ZIP 37722 is 9 miles from Waterville 2, NC, which stands at 1,430 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 37722 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.