Frost Dates for 05828 — Danville, Vermont

Half of springs at Saint Johnsbury, VT see their last 32°F night by May 13; only one in ten is past it by April 30, and one in ten still has one after May 25. Planting tender crops after May 19 leaves a 30% risk of a frost on them, after May 21 20%, and after May 25 10%. The 12 days between the even-odds date and the one-in-ten date is narrower than at 85% of the 41 Vermont stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 3 in half of years, as early as September 21 one year in ten, and holds off past October 16 one year in ten. A hard freeze of 28°F follows 10 days later, around October 13; in spring the one-in-ten date for 28°F is May 15, 10 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 160 days one year in ten and falls short of 126 one year in ten. On average 162 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 12 days longer, to about May 25, and return around September 24. Severe cold of 16°F or below comes every winter, usually between November 16 and April 2.

July is the warmest month at Saint Johnsbury, VT, averaging 81°F by day and 58°F at night; January is the coldest at 28°F and 9°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 88% of years.

Warmth for growing adds up to 2,343 growing degree days a year (base 50°F), more than at 73% of the 41 Vermont stations. 32% of them (748) have built up by the end of June, and July adds the most, 611. Precipitation totals 40.5 inches a year, most in July (4.5") and least in February (2.2"); May to September bring 49% of it.

The nearest other station, Sutton, VT, 14 miles north of Danville and 800 feet higher, has a last frost 4 days earlier (May 9), a first frost 2 days earlier (October 1).

The first measurable snow (0.1 inch or more) in Danville 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, 5.4 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 26 days after the last snow.

ZIP 05828 is 5 miles from Saint Johnsbury, VT, which stands at 700 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 05819 (St Johnsbury). The 2023 USDA Plant Hardiness Zone Map lists ZIP 05828 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.