Frost Dates for 70085 — Saint Bernard, Louisiana

Half of springs at St Bernard, LA see their last 32°F night by February 4; only one in ten is past it by December 31, and one in ten still has one after March 6. Planting tender crops after February 18 leaves a 30% risk of a frost on them, after February 27 20%, and after March 6 10%. The 30 days between the even-odds date and the one-in-ten date is wider than at 91% 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 December 15 in half of years, as early as November 23 one year in ten, and holds off past January 10 one year in ten. A hard freeze of 28°F follows 15 days later, around December 30; in spring the one-in-ten date for 28°F is February 23, 11 days before the 32°F one. The freeze-free season lasts 312 days in a typical year, longer than at 91% of the 88 Louisiana stations; it reaches 348 days one year in ten and falls short of 275 one year in ten. On average 8 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 22 days longer, to about February 26, and return around November 30. A 24°F night is unusual: 41% of winters had one.

August is the warmest month at St Bernard, LA, averaging 89°F by day and 75°F at night; January is the coldest at 62°F and 44°F. From April to October the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 46% of years and March still brings one in 17% of years.

Warmth for growing adds up to 6,979 growing degree days a year (base 50°F), more than at 76% of the 88 Louisiana stations. 43% of them (2,995) have built up by the end of June, and August adds the most, 987.

The nearest other station, Chalmette, LA, 12 miles northwest of Saint Bernard, has a last frost 6 days later (February 10), a first frost 2 days later (December 17), a season 3 days shorter.

Measurable snow is rare here: only 1 of 15 winters from 1991 to 2020 recorded 0.1 inch or more at St Bernard, LA, 0.9 miles away, so there is no typical first-snow date to plan around.

ZIP 70085 is under a mile from St Bernard, LA, which stands at 5 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 70092 (Violet). The 2023 USDA Plant Hardiness Zone Map lists ZIP 70085 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°C) over 1991–2020; a zone describes winter lows, not frost dates.