Frost Dates for 05091 — Woodstock, Vermont

Half of springs at Woodstock, VT see their last 32°F night by May 13; only one in ten is past it by April 29, and one in ten still has one after May 27. Planting tender crops after May 19 leaves a 30% risk of a frost on them, after May 22 20%, and after May 27 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 54% of the 41 Vermont stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 1 in half of years, as early as September 20 one year in ten, and holds off past October 15 one year in ten. A hard freeze of 28°F follows 11 days later, around October 12; in spring the one-in-ten date for 28°F is May 15, 12 days before the 32°F one. The freeze-free season lasts 141 days in a typical year, shorter than at 61% of the 41 Vermont stations; it reaches 162 days one year in ten and falls short of 123 one year in ten. On average 172 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 24, and return around September 23. Severe cold of 16°F or below comes every winter, usually between November 19 and March 30.

July is the warmest month at Woodstock, VT, averaging 82°F by day and 57°F at night; January is the coldest at 30°F and 7°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 83% of years.

Warmth for growing adds up to 2,230 growing degree days a year (base 50°F), more than at 59% of the 41 Vermont stations. 31% of them (691) have built up by the end of June, and July adds the most, 604. Precipitation totals 42.6 inches a year, most in October (4.6") and least in February (2.7"); May to September bring 44% of it.

The nearest other station, N Hartland Lake, VT, 9 miles east of Woodstock, has a last frost 5 days earlier (May 8), a first frost 5 days later (October 6), a season 9 days longer.

The first measurable snow (0.1 inch or more) in Woodstock usually arrives around November 18, and the last of the season around April 5. Those are the middle dates across the winters of 1991–2020 at Woodstock, VT, 1.5 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 38 days after the last snow.

ZIP 05091 is 2 miles from Woodstock, VT, which stands at 600 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 05091 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.