Frost Dates for 05851 — Lyndonville, Vermont

Half of springs at Sutton, VT see their last 32°F night by May 9; only one in ten is past it by April 27, and one in ten still has one after May 25. Planting tender crops after May 16 leaves a 30% risk of a frost on them, after May 20 20%, and after May 25 10%. The 16 days between the even-odds date and the one-in-ten date is wider than at 78% 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 14 one year in ten. A hard freeze of 28°F follows 12 days later, around October 13; in spring the one-in-ten date for 28°F is May 11, 14 days before the 32°F one. The freeze-free season lasts 143 days in a typical year, shorter than at 44% of the 41 Vermont stations; it reaches 162 days one year in ten and falls short of 124 one year in ten. On average 177 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 15 days longer, to about May 24, and return around September 21. Severe cold of 16°F or below comes every winter, usually between November 15 and April 3.

July is the warmest month at Sutton, VT, averaging 76°F by day and 56°F at night; January is the coldest at 23°F and 4°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 79% of years.

Warmth for growing adds up to 1,719 growing degree days a year (base 50°F), fewer than at 88% of the 41 Vermont stations. 30% of them (512) have built up by the end of June, and July adds the most, 493. Precipitation totals 47.7 inches a year, most in July (5.0") and least in January (3.0"); May to September bring 47% of it.

The nearest other station, Saint Johnsbury, VT, 8 miles south of Lyndonville and 800 feet lower, has a last frost 4 days later (May 13), a first frost 2 days later (October 3).

The first measurable snow (0.1 inch or more) in Lyndonville usually arrives around November 6, and the last of the season around April 17. Those are the middle dates across the winters of 1991–2020 at Saint Johnsbury, VT, 8.4 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 22 days after the last snow.

ZIP 05851 is 5 miles from Sutton, VT, which stands at 1,500 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 05851 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.