Frost Dates for 40146 — Irvington, Kentucky

Half of springs at Corners, KY see their last 32°F night by April 25; only one in ten is past it by April 11, 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 17 days between the even-odds date and the one-in-ten date is narrower than at 47% of the 113 Kentucky stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 16 in half of years, as early as October 4 one year in ten, and holds off past October 27 one year in ten. A hard freeze of 28°F follows 9 days later, around October 25; in spring the one-in-ten date for 28°F is April 28, 14 days before the 32°F one. The freeze-free season lasts 172 days in a typical year, shorter than at 95% of the 113 Kentucky stations; it reaches 192 days one year in ten and falls short of 154 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 8 days longer, to about May 3, and return around October 8. Severe cold of 16°F or below comes every winter, usually between November 30 and March 8.

July is the warmest month at Corners, KY, averaging 88°F by day and 63°F at night; January is the coldest at 42°F and 22°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 30% of years.

Warmth for growing adds up to 3,704 growing degree days a year (base 50°F), fewer than at 79% of the 113 Kentucky stations. 37% of them (1,362) have built up by the end of June, and July adds the most, 787. Precipitation totals 51.7 inches a year, most in May (5.9") and least in August (3.3"); May to September bring 42% of it.

The nearest other station, Brandenburg, KY, 12 miles northeast of Irvington, has a last frost 6 days earlier (April 19), a first frost 8 days later (October 24), a season 14 days longer.

The first measurable snow (0.1 inch or more) in Irvington usually arrives around December 26, and the last of the season around February 13. Those are the middle dates across the winters of 1991–2020 at Cannelton, IN, 21.5 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 71 days after the last snow.

ZIP 40146 is 8 miles from Corners, KY, which stands at 615 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 40146 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.