Frost Dates for 23168 — Toano, Virginia

Half of springs at Williamsburg 2 N, VA see their last 32°F night by March 31; only one in ten is past it by March 15, and one in ten still has one after April 14. Planting tender crops after April 5 leaves a 30% risk of a frost on them, after April 9 20%, and after April 14 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 128 Virginia stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 10 in half of years, as early as October 29 one year in ten, and holds off past November 26 one year in ten. A hard freeze of 28°F follows 13 days later, around November 23; in spring the one-in-ten date for 28°F is April 4, 10 days before the 32°F one. The freeze-free season lasts 225 days in a typical year, longer than at 91% of the 128 Virginia stations; it reaches 248 days one year in ten and falls short of 205 one year in ten. On average 68 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 April 12, and return around November 1. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 84%.

July is the warmest month at Williamsburg 2 N, VA, averaging 89°F by day and 70°F at night; January is the coldest at 49°F and 31°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 47% of years.

Warmth for growing adds up to 4,664 growing degree days a year (base 50°F), more than at 94% of the 128 Virginia stations. 37% of them (1,727) have built up by the end of June, and July adds the most, 910. Precipitation totals 51.4 inches a year, most in July (5.9") and least in February (3.1"); May to September bring 49% of it.

The nearest other station, W Pt 2 NW, VA, 11 miles north of Toano, has a last frost 6 days later (April 6), a first frost 9 days earlier (November 1), a season 17 days shorter.

The first measurable snow (0.1 inch or more) in Toano usually arrives around December 28, and the last of the season around March 3. Those are the middle dates across the winters of 1991–2020 at W Pt 2 NW, VA, 11.2 miles away: half of years saw snow earlier, half later. Snow fell in 97% of those winters. The last 32°F night of spring typically comes 28 days after the last snow.

ZIP 23168 is 9 miles from Williamsburg 2 N, VA, which stands at 70 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 23185 (Williamsburg). The 2023 USDA Plant Hardiness Zone Map lists ZIP 23168 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.