Frost Dates for 39211 — Jackson, Mississippi

Half of springs at Jackson International Airport, MS see their last 32°F night by March 14; only one in ten is past it by February 22, and one in ten still has one after April 2. Planting tender crops after March 22 leaves a 30% risk of a frost on them, after March 27 20%, and after April 2 10%. The 19 days between the even-odds date and the one-in-ten date is narrower than at 38% of the 96 Mississippi stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 14 in half of years, as early as October 31 one year in ten, and holds off past December 4 one year in ten. A hard freeze of 28°F follows 14 days later, around November 28; in spring the one-in-ten date for 28°F is March 17, 16 days before the 32°F one. The freeze-free season lasts 245 days in a typical year, longer than at 64% of the 96 Mississippi stations; it reaches 275 days one year in ten and falls short of 219 one year in ten. On average 40 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 29, and return around November 3. Nights of 24°F, cold enough to damage hardier plants, come in 96% of winters and 16°F in 33%.

July is the warmest month at Jackson International Airport, MS, averaging 92°F by day and 72°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 May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 77% of years and April still brings one in 12% of years.

Warmth for growing adds up to 6,162 growing degree days a year (base 50°F), more than at 66% of the 96 Mississippi stations. 41% of them (2,540) have built up by the end of June, and July adds the most, 997. Precipitation totals 57.3 inches a year, most in April (5.8") and least in September (3.5"); May to September bring 38% of it.

The nearest other station, Jackson Hawkins Field, MS, 6 miles southwest of Jackson, has a last frost 8 days earlier (March 6), a first frost 5 days later (November 19), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Jackson usually arrives around January 13, and the last of the season around January 23. Those are the middle dates across the winters of 1991–2020 at Jackson International Airport, MS, 4.6 miles away: half of years saw snow earlier, half later. Snow fell in 53% of those winters. The last 32°F night of spring typically comes 50 days after the last snow.

ZIP 39211 is 5 miles from Jackson International Airport, MS, which stands at 296 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 8 other ZIP codes share the station; its figures are presented in full for 39110 (Madison). The 2023 USDA Plant Hardiness Zone Map lists ZIP 39211 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.