Frost Dates for 40402 — Annville, Kentucky

Half of springs at Booneville 12SW, KY see their last 32°F night by April 24; only one in ten is past it by April 9, and one in ten still has one after May 12. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 6 20%, and after May 12 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 54% of the 113 Kentucky stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 7 one year in ten, and holds off past October 31 one year in ten. A hard freeze of 28°F follows 9 days later, around October 28; in spring the one-in-ten date for 28°F is April 30, 12 days before the 32°F one. The freeze-free season lasts 178 days in a typical year, shorter than at 87% of the 113 Kentucky stations; it reaches 196 days one year in ten and falls short of 157 one year in ten. On average 124 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 May 5, and return around October 11. Severe cold of 16°F or below comes every winter, usually between December 4 and March 3.

July is the warmest month at Booneville 12SW, KY, averaging 86°F by day and 63°F at night; January is the coldest at 44°F and 23°F. A freezing night is all but certain in every month from October 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 32% of years.

Warmth for growing adds up to 3,649 growing degree days a year (base 50°F), fewer than at 83% of the 113 Kentucky stations. 37% of them (1,338) have built up by the end of June, and July adds the most, 763.

The nearest other station, Manchester 4 W, KY, 13 miles southeast of Annville, has a last frost 5 days later (April 29), a first frost 3 days earlier (October 16), a season 8 days shorter.

The first measurable snow (0.1 inch or more) in Annville usually arrives around December 10, and the last of the season around March 10. Those are the middle dates across the winters of 1991–2020 at Booneville 12SW, KY, 12.1 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 45 days after the last snow.

ZIP 40402 is 12 miles from Booneville 12SW, KY, which stands at 880 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 41314 (Booneville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 40402 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.