When is the last frost in Hattiesburg, MS?

The average last spring frost (50% probability of 32°F) in Hattiesburg is around March 8, based on NOAA/NCEI 1991–2020 normals at the Hattiesburg Chain Muni Ap, MS station (3.4 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Hattiesburg?

The average first fall frost in Hattiesburg, MS is around November 15, giving roughly a 252-day frost-free growing season.

What planting zone is Hattiesburg, MS?

Hattiesburg is in USDA plant hardiness zone 8b (average annual extreme minimum temperature 15 to 20°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Hattiesburg?

In Hattiesburg, MS the warmest month is August (avg high 91.4°F) and the coldest is January (avg low 37.8°F). It averages about 64.4″ of precipitation a year and 0.9″ of snow.

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Hattiesburg, MS Planting Calendar & Frost Dates

USDA hardiness zone 8b · ZIP 39401 · elevation 117′ · NOAA & USDA data

Hattiesburg is in USDA hardiness zone 8b (winters can dip to 15 to 20°F), with a growing season of about 252 days between the average last spring frost (March 8) and first fall frost (November 15). The warmest month is August (avg high 91.4°F); the coldest is January (avg low 37.8°F). It averages 64.4″ of precipitation a year and 0.9″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 15 to 20°F

Last spring frost

March 8

avg (50% prob, 32°F)

First fall frost

November 15

avg (50% prob, 32°F)

Growing season

252 days

frost-free window

Warmest month

August

avg high 91.4°F

Month-by-month typical weather in Hattiesburg

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Hattiesburg 5sw, MS (4.6 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	59.7	37.8	48.8	6.5	0.2
February	64	41.2	52.6	5.7	0.1
March	71.1	47.9	59.5	5.9	0.1
April	77.5	54.1	65.8	5.7	0
May	84.2	62.4	73.3	4.5	0
June	89.7	69.5	79.6	5.3	0
July	91.2	71.8	81.5	6.4	0
August	91.4	71.5	81.4	6.3	0
September	87.9	66.9	77.4	4.8	0
October	79.4	56	67.7	3.5	0
November	69.3	45.7	57.5	3.9	0
December	61.8	40.3	51.1	6	0.5

What to plant when in Hattiesburg

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 25 · Transplant out: March 15
Peppers	warm	Start seeds indoors: January 11 · Transplant out: March 22
Cucumbers	warm	Direct sow: March 15
Zucchini / squash	warm	Direct sow: March 15
Bush beans	warm	Direct sow: March 15
Sweet corn	warm	Direct sow: March 15
Basil	warm	Transplant out: March 15
Peas	cool	Sow (spring): February 1 · Sow (fall): September 20
Spinach	cool	Sow (spring): January 25 · Sow (fall): September 20
Lettuce	cool	Sow (spring): February 8 · Sow (fall): September 20
Kale	cool	Transplant (spring): February 15 · Sow (fall): September 6
Broccoli	cool	Transplant (spring): February 22
Carrots	cool	Sow (spring): February 15 · Sow (fall): September 6
Onions	cool	Transplant (spring): February 8
Potatoes	cool	Plant seed potatoes: February 22
Radishes	cool	Sow (spring): February 8 · Sow (fall): October 4

Dates are computed from Hattiesburg's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Mississippi

Gulfport, MS Biloxi, MS Meridian, MS Jackson, MS Southaven, MS

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Hattiesburg Chain Muni Ap, MS, 3.4 mi (confidence: high). Monthly weather normals: Hattiesburg 5sw, MS, 4.6 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.