Frost dates for Hattiesburg, Mississippi
In Hattiesburg, half of springs have had their last frost by March 8 (and 1 spring in 10 still has one after March 28), and half of falls have had their first frost by November 15, leaving about 252 frost-free days in a typical year. Here is how sure those dates are, what they mean for planting, and where they come from.
Frost dates for
Hattiesburg, Mississippi
Last spring frost
March 8
Half of springs have their last frost by this date. For a safer bet, wait until March 28: only 1 spring in 10 has a frost after that.
First fall frost
November 15
Half of falls have their first frost by this date. In 1 fall in 10 it comes by November 1.
Growing season
252 days
Frost-free days in a typical year. 9 years in 10 get at least 225.
Hardiness zone
8b
2023 USDA map: the coldest night of winter averages 15°F to 20°F. It was 8b on the 2012 map too. All 3 ZIP codes within about 6 miles of the city's center are in zone 8b.
Print a year planner for Hattiesburg
Frost risk through the year
How sure are these dates?
A frost date is a probability, not a promise. NOAA worked out, from 30 years of nightly lows, how often the last spring frost and the first fall frost fall on each date. The middle column is the typical year. The outer columns are the early and late years that come about once a decade.
| Early year 1 in 10 | Typical year 1 in 2 | Late year 1 in 10 | |
|---|---|---|---|
| Last frost in spring | February 16 | March 8 | March 28 |
| First frost in fall | November 1 | November 15 | December 4 |
The frost-free season between them runs 252 days in a typical year. In 1 year in 10 it is 283 days or longer, and in 1 year in 10 it is 225 days or shorter.
- Hard freeze (28°F): typically last on February 22 and first on November 30. It is a harder freeze than the 32°F frost line, cold enough to damage many garden plants; how hardy a crop is decides whether it comes through. (The National Weather Service's own hard-freeze threshold varies from office to office.)
- Frost possible (36°F at the station): typically last on March 24 and first on November 4. On clear, still nights the ground can be several degrees colder than the thermometer, so frost can form on plants when the official reading is in the mid-30s.
In 8 springs out of 10, the last frost in Hattiesburg comes between February 16 and March 28, a window of 40 days. That is wider than at most NOAA stations (the typical window is 31 days), so spring here is less predictable than average: lean toward the later date.
Among Mississippi's 91 NOAA stations with a frost every year, 84 percent have their typical last frost later than Hattiesburg does.
Planting calendar for Hattiesburg
These dates count from the typical last and first frosts, using the planting rules published by Colorado State University Extension (spring), Virginia Cooperative Extension (fall crops) and University of Minnesota Extension (garlic, where winters are hard). Weather in any one year can run early or late, so check the forecast before you plant tender crops.
| When | What to do | Why then |
|---|---|---|
| January | ||
| January 4 to February 1 | Cauliflower Start seeds indoors | 5 to 7 weeks before planting out |
| January 18 to February 8 | Eggplant Start seeds indoors | 6 to 9 weeks before planting out |
| January 25 to February 8 | Peppers Start seeds indoors | 6 to 8 weeks before planting out |
| February | ||
| February 1 to 15 | Tomatoes Start seeds indoors | 5 to 7 weeks before planting out |
| February 8 to 22 | Peas, spinach, lettuce, radishes, onion sets, turnips Sow outdoors, as early as | hardy crops: 2 to 4 weeks before the typical last frost |
| February 8 to 22 | Broccoli and cabbage Plant out, as early as | hardy crops: 2 to 4 weeks before the typical last frost |
| February 22 to March 8 | Beets, carrots, potatoes, Swiss chard Plant outdoors, as early as | semi-hardy crops: up to 2 weeks before the typical last frost |
| February 22 to March 8 | Cauliflower Plant out, as early as | semi-hardy: up to 2 weeks before the typical last frost |
| March | ||
| March 8 | Snap beans, sweet corn, cucumbers, summer squash Sow outdoors around | tender crops: around the typical last frost date |
| March 22 | Tomatoes, peppers, eggplant Plant out from | very tender: 2 weeks or more after the typical last frost |
| March 22 | Melons, winter squash, pumpkins, lima beans Sow outdoors from | very tender: 2 weeks or more after the typical last frost |
| June | ||
| June 20 to July 4 | Cabbage for fall Start seeds | set the plants out by August 8 |
| July | ||
| July 10 to 24 | Broccoli for fall Start seeds | set the plants out by August 28 |
| August | ||
| August 19 | Snap beans for fall Last date to sow | 60 days to harvest, plus 2 weeks for slower fall growth, plus 2 weeks because frost kills it |
| August 23 | Carrots for fall Last date to sow | 70 days to harvest, plus 2 weeks for slower fall growth |
| August 24 | Cucumbers for fall Last date to sow | 55 days to harvest, plus 2 weeks for slower fall growth, plus 2 weeks because frost kills it |
| August 28 | Peas for fall Last date to sow | 65 days to harvest, plus 2 weeks for slower fall growth |
| August 29 | Summer squash for fall Last date to sow | 50 days to harvest, plus 2 weeks for slower fall growth, plus 2 weeks because frost kills it |
| September | ||
| September 2 | Leaf lettuce and beets for fall Last date to sow | 60 days to harvest, plus 2 weeks for slower fall growth |
| September 12 | Turnips and kohlrabi for fall Last date to sow | 50 days to harvest, plus 2 weeks for slower fall growth |
| September 22 | Spinach for fall Last date to sow | 40 days to harvest, plus 2 weeks for slower fall growth |
| October | ||
| October 2 | Radishes for fall Last date to sow | 30 days to harvest, plus 2 weeks for slower fall growth |
| November | ||
| November 1 | Tomatoes, peppers, squash, melons, cucumbers Watch the forecast from | in 1 fall in 10 the first frost comes by this date; pick tender crops before a frost |
| December | ||
| December 7 to 14 | Garlic Plant cloves | one or two weeks after the typical first hard freeze (28°F), our reading of the first killing frost |
| December 21 to January 18 | Broccoli and cabbage Start seeds indoors | 5 to 7 weeks before planting them out |
Want more insurance? Shift every spring date 20 days later. That plans around March 28, the date after which only 1 spring in 10 has a frost.
For spring bulbs such as tulips and daffodils, plant once the soil has cooled to about 50 to 55°F and keep going until a couple of weeks before the ground freezes. Our guide to fall planting explains how to tell.
Where these numbers come from
These dates come from NOAA's weather station Hattiesburg Chain Municipal Airport (station USW00013833), 4 miles from the center of Hattiesburg. It sits at about the same elevation, 150 feet above sea level. NOAA rates this station's record as representative: at least 10 of the 30 years, with the gaps filled from nearby stations.
The same station also gives the frost dates for Petal.
Our ZIP code lookup matches these 4 ZIP codes to the same station, so they get the same dates: 39401, 39406, 39459, 39465. Hardiness zones are worked out separately for each ZIP code.
The nearest other places with pages
- Gulfport, Mississippi: last frost around February 23, first frost around December 3 (65 miles away)
- Mobile, Alabama: last frost around February 21, first frost around December 6 (85 miles away)
- Jackson, Mississippi: last frost around March 6, first frost around November 19 (85 miles away)
See frost dates across Mississippi, or look up your own ZIP code for the station nearest you. Want the background? Read what a last frost date really means.