Frost Dates for 71378 — Wisner, Louisiana

Half of springs at Winnsboro 5 SSE, LA see their last 32°F night by March 10; only one in ten is past it by February 17, and one in ten still has one after March 31. Planting tender crops after March 18 leaves a 30% risk of a frost on them, after March 24 20%, and after March 31 10%. The 21 days between the even-odds date and the one-in-ten date is narrower than at 60% of the 88 Louisiana stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.

In fall the first 32°F night comes by November 16 in half of years, as early as November 1 one year in ten, and holds off past December 5 one year in ten. A hard freeze of 28°F follows 15 days later, around December 1; in spring the one-in-ten date for 28°F is March 16, 15 days before the 32°F one. The freeze-free season lasts 250 days in a typical year, shorter than at 78% of the 88 Louisiana stations; it reaches 279 days one year in ten and falls short of 224 one year in ten. On average 36 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 March 25, and return around November 4. Nights of 24°F, cold enough to damage hardier plants, come in 94% of winters and 16°F in 22%.

July is the warmest month at Winnsboro 5 SSE, LA, averaging 93°F by day and 73°F at night; January is the coldest at 57°F and 37°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 69% of years.

Warmth for growing adds up to 6,400 growing degree days a year (base 50°F), fewer than at 63% of the 88 Louisiana stations. 41% of them (2,642) have built up by the end of June, and July adds the most, 1,026. Precipitation totals 58.4 inches a year, most in April (6.3") and least in September (3.6"); May to September bring 36% of it.

The nearest other station, Winnsboro 2 SE, LA, 14 miles north of Wisner, has a last frost 3 days earlier (March 7), a first frost 3 days earlier (November 13), a season 2 days longer.

Measurable snow is rare here: only 3 of 28 winters from 1991 to 2020 recorded 0.1 inch or more at Winnsboro 5 SSE, LA, 11.2 miles away, so there is no typical first-snow date to plan around.

ZIP 71378 is 11 miles from Winnsboro 5 SSE, LA, which stands at 80 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 71378 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°C) over 1991–2020; a zone describes winter lows, not frost dates.