Frost Dates for 70456 — Roseland, Louisiana

Half of springs at Amite, LA see their last 32°F night by March 7; only one in ten is past it by February 10, 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 24 days between the even-odds date and the one-in-ten date is wider than at 63% 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 18 in half of years, as early as November 1 one year in ten, and holds off past December 8 one year in ten. A hard freeze of 28°F follows 14 days later, around December 2; 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 257 days in a typical year, shorter than at 64% of the 88 Louisiana stations; it reaches 289 days one year in ten and falls short of 227 one year in ten. On average 35 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 19 days longer, to about March 26, and return around November 5. Nights of 24°F, cold enough to damage hardier plants, come in 88% of winters and 16°F in 18%.

August is the warmest month at Amite, LA, averaging 92°F by day and 71°F at night; January is the coldest at 61°F and 39°F. A freezing night is all but certain in every month from December to 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 88% of years and March still brings one in 59% of years.

Warmth for growing adds up to 6,444 growing degree days a year (base 50°F), fewer than at 61% of the 88 Louisiana stations. 42% of them (2,709) have built up by the end of June, and August adds the most, 972. Precipitation totals 63.8 inches a year, most in August (6.6") and least in September (3.6"); May to September bring 45% of it.

The nearest other station, Hammond 5 E, LA, 20 miles southeast of Roseland, has a last frost 1 day later (March 8), a first frost 1 day later (November 19).

Measurable snow is rare here: only 1 of 19 winters from 1991 to 2020 recorded 0.1 inch or more at Amite, LA, 4.2 miles away, so there is no typical first-snow date to plan around.

ZIP 70456 is 4 miles from Amite, LA, which stands at 170 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 70422 (Amite). The 2023 USDA Plant Hardiness Zone Map lists ZIP 70456 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.