Frost Dates for 37658 — Hampton, Tennessee

Half of springs at Elizabethton, TN see their last 32°F night by April 19; only one in ten is past it by April 2, and one in ten still has one after May 7. Planting tender crops after April 27 leaves a 30% risk of a frost on them, after May 1 20%, and after May 7 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 October 24 in half of years, as early as October 10 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 8 days later, around November 1; in spring the one-in-ten date for 28°F is April 23, 14 days before the 32°F one. The freeze-free season lasts 187 days in a typical year, shorter than at 87% of the 144 Tennessee stations; it reaches 208 days one year in ten and falls short of 164 one year in ten. On average 94 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 11 days longer, to about April 30, and return around October 16. Severe cold of 16°F or below comes every winter, usually between December 7 and February 23.

July is the warmest month at Elizabethton, TN, averaging 86°F by day and 64°F at night; January is the coldest at 46°F and 26°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 21% of years.

Warmth for growing adds up to 3,772 growing degree days a year (base 50°F), fewer than at 88% of the 144 Tennessee stations. 37% of them (1,404) have built up by the end of June, and July adds the most, 759. Precipitation totals 48.2 inches a year, most in July (5.9") and least in October (2.8"); May to September bring 47% of it.

The nearest other station, Roan Mountain 3SW, TN, 9 miles southeast of Hampton and 1,436 feet higher, has a last frost 11 days later (April 30), a first frost 12 days earlier (October 12), a season 22 days shorter.

The first measurable snow (0.1 inch or more) in Hampton usually arrives around December 14, and the last of the season around February 22. Those are the middle dates across the winters of 1991–2020 at Elizabethton, TN, 7.1 miles away: half of years saw snow earlier, half later. Snow fell in 84% of those winters. The last 32°F night of spring typically comes 56 days after the last snow.

ZIP 37658 is 7 miles from Elizabethton, TN, which stands at 1,487 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 37601 (Johnson City). The 2023 USDA Plant Hardiness Zone Map lists ZIP 37658 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.