Frost Dates for 13309 — Boonville, New York

Half of springs at Boonville 4 SSW, NY see their last 32°F night by May 10; only one in ten is past it by April 28, and one in ten still has one after May 28. Planting tender crops after May 18 leaves a 30% risk of a frost on them, after May 22 20%, and after May 28 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 96% of the 173 New York stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 4 in half of years, as early as September 22 one year in ten, and holds off past October 18 one year in ten. A hard freeze of 28°F follows 11 days later, around October 15; in spring the one-in-ten date for 28°F is May 16, 12 days before the 32°F one. The freeze-free season lasts 145 days in a typical year, shorter than at 80% of the 173 New York stations; it reaches 165 days one year in ten and falls short of 126 one year in ten. On average 170 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 May 24, and return around September 25. Severe cold of 16°F or below comes every winter, usually between November 17 and April 3.

July is the warmest month at Boonville 4 SSW, NY, averaging 75°F by day and 56°F at night; January is the coldest at 25°F and 8°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 81% of years.

Warmth for growing adds up to 1,759 growing degree days a year (base 50°F), fewer than at 97% of the 173 New York stations. 30% of them (534) have built up by the end of June, and July adds the most, 482. Precipitation totals 58.2 inches a year, most in October (6.1") and least in February (4.0"); May to September bring 41% of it.

The nearest other station, Trenton Falls, NY, 17 miles southeast of Boonville and 750 feet lower, has a last frost 6 days earlier (May 4), a first frost 9 days later (October 13), a season 16 days longer.

The first measurable snow (0.1 inch or more) in Boonville usually arrives around November 2, and the last of the season around April 20. Those are the middle dates across the winters of 1991–2020 at Boonville 4 SSW, NY, 3.8 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 20 days after the last snow.

ZIP 13309 is 4 miles from Boonville 4 SSW, NY, which stands at 1,550 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 13309 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.