Frost Dates for 70757 — Maringouin, Louisiana

Half of springs at Brusly 2 W, LA see their last 32°F night by February 28; only one in ten is past it by January 31, and one in ten still has one after March 21. Planting tender crops after March 8 leaves a 30% risk of a frost on them, after March 14 20%, and after March 21 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 24 in half of years, as early as November 6 one year in ten, and holds off past December 17 one year in ten. A hard freeze of 28°F follows 15 days later, around December 9; in spring the one-in-ten date for 28°F is March 8, 13 days before the 32°F one. The freeze-free season lasts 268 days in a typical year, longer than at 50% of the 88 Louisiana stations; it reaches 305 days one year in ten and falls short of 240 one year in ten. On average 26 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 17 days longer, to about March 17, and return around November 10. Nights of 24°F, cold enough to damage hardier plants, come in 73% of winters and 16°F in 6%.

July is the warmest month at Brusly 2 W, LA, averaging 91°F by day and 72°F at night; January is the coldest at 62°F and 40°F. A freezing night is all but certain in January (a 90% chance or more). From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 82% of years and March still brings one in 45% of years.

Warmth for growing adds up to 6,634 growing degree days a year (base 50°F), more than at 55% of the 88 Louisiana stations. 43% of them (2,828) have built up by the end of June, and July adds the most, 986. Precipitation totals 64.6 inches a year, most in June (6.7") and least in November (4.0"); May to September bring 45% of it.

The nearest other station, New Roads 5 NE, LA, 19 miles northeast of Maringouin, has a last frost 9 days earlier (February 19), a first frost 11 days later (December 5), a season 24 days longer.

Measurable snow is rare here: only 0 of 19 winters from 1991 to 2020 recorded 0.1 inch or more at Brusly 2 W, LA, 15.9 miles away, so there is no typical first-snow date to plan around.

ZIP 70757 is 16 miles from Brusly 2 W, LA, which stands at 20 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 70767 (Port Allen). The 2023 USDA Plant Hardiness Zone Map lists ZIP 70757 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°C) over 1991–2020; a zone describes winter lows, not frost dates.