Frost Dates for 39470 — Poplarville, Mississippi

Half of springs at Poplarville Exp Stn, MS see their last 32°F night by March 10; only one in ten is past it by February 16, and one in ten still has one after April 1. Planting tender crops after March 18 leaves a 30% risk of a frost on them, after March 23 20%, and after April 1 10%. The 22 days between the even-odds date and the one-in-ten date is wider than at 85% of the 96 Mississippi 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 21 in half of years, as early as November 2 one year in ten, and holds off past December 12 one year in ten. A hard freeze of 28°F follows 12 days later, around December 3; in spring the one-in-ten date for 28°F is March 16, 16 days before the 32°F one. The freeze-free season lasts 257 days in a typical year, longer than at 85% of the 96 Mississippi stations; it reaches 287 days one year in ten and falls short of 227 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 15 days longer, to about March 25, and return around November 8. Nights of 24°F, cold enough to damage hardier plants, come in 93% of winters and 16°F in 30%.

July is the warmest month at Poplarville Exp Stn, MS, averaging 91°F by day and 71°F at night; January is the coldest at 59°F and 39°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to October the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 67% of years and April still brings one in 10% of years.

Warmth for growing adds up to 6,256 growing degree days a year (base 50°F), more than at 75% of the 96 Mississippi stations. 42% of them (2,619) have built up by the end of June, and July adds the most, 953. Precipitation totals 65.0 inches a year, most in July (6.9") and least in October (4.0"); May to September bring 45% of it.

The nearest other station, Bogalusa, LA, 17 miles west of Poplarville and 213 feet lower, has a last frost 8 days earlier (March 2), a first frost 2 days later (November 23), a season 8 days longer.

Measurable snow is rare here: only 1 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Poplarville Exp Stn, MS, 2.4 miles away, so there is no typical first-snow date to plan around.

ZIP 39470 is 2 miles from Poplarville Exp Stn, MS, which stands at 313 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 39470 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.