Frost Dates for 05445 — Charlotte, Vermont

Half of springs at Willsboro 1 N, NY see their last 32°F night by May 2; only one in ten is past it by April 20, and one in ten still has one after May 16. Planting tender crops after May 7 leaves a 30% risk of a frost on them, after May 10 20%, and after May 16 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 14 in half of years, as early as October 2 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 14 days later, around October 28; in spring the one-in-ten date for 28°F is May 3, 13 days before the 32°F one. The freeze-free season lasts 165 days in a typical year, longer than at 93% of the 41 Vermont stations; it reaches 185 days one year in ten and falls short of 146 one year in ten. On average 145 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 10 days longer, to about May 12, and return around October 4. Severe cold of 16°F or below comes every winter, usually between November 26 and March 24.

July is the warmest month at Willsboro 1 N, NY, averaging 80°F by day and 61°F at night; January is the coldest at 29°F and 11°F. A freezing night is all but certain in every month from November 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 55% of years.

Warmth for growing adds up to 2,445 growing degree days a year (base 50°F), more than at 83% of the 41 Vermont stations. 31% of them (749) have built up by the end of June, and July adds the most, 646.

The nearest other station, Vergennes, VT, 10 miles south of Charlotte, has a last frost 2 days earlier (April 30), a first frost 3 days later (October 17), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Charlotte usually arrives around November 7, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Burlington International Airport, VT, 11.8 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 19 days after the last snow.

ZIP 05445 is 9 miles from Willsboro 1 N, NY, which stands at 180 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 05445 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.