Frost Dates for 38456 — Ethridge, Tennessee

Half of springs at Lawrenceburg Filt Plt, TN see their last 32°F night by April 8; only one in ten is past it by March 19, and one in ten still has one after April 26. Planting tender crops after April 15 leaves a 30% risk of a frost on them, after April 20 20%, and after April 26 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 31 in half of years, as early as October 18 one year in ten, and holds off past November 13 one year in ten. A hard freeze of 28°F follows 7 days later, around November 7; in spring the one-in-ten date for 28°F is April 13, 13 days before the 32°F one. The freeze-free season lasts 204 days in a typical year, shorter than at 47% of the 144 Tennessee stations; it reaches 228 days one year in ten and falls short of 182 one year in ten. On average 81 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 22, and return around October 21. Severe cold of 16°F or below comes in 98% of winters, usually between December 24 and February 10.

July is the warmest month at Lawrenceburg Filt Plt, TN, averaging 88°F by day and 68°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 67% of years.

Warmth for growing adds up to 4,476 growing degree days a year (base 50°F), more than at 53% of the 144 Tennessee stations. 38% of them (1,715) have built up by the end of June, and July adds the most, 860.

The nearest other station, Mt Pleasant 1N, TN, 16 miles north of Ethridge, has a last frost 3 days earlier (April 5), a first frost 3 days earlier (October 28).

The first measurable snow (0.1 inch or more) in Ethridge usually arrives around January 16, and the last of the season around February 14. Those are the middle dates across the winters of 1991–2020 at Lawrenceburg Filt Plt, TN, 8 miles away: half of years saw snow earlier, half later. Snow fell in 71% of those winters. The last 32°F night of spring typically comes 53 days after the last snow.

ZIP 38456 is 8 miles from Lawrenceburg Filt Plt, TN, which stands at 870 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 38464 (Lawrenceburg). The 2023 USDA Plant Hardiness Zone Map lists ZIP 38456 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.