Frost dates / Mississippi / Hattiesburg

Frost dates in Hattiesburg, MS

The station on this page is HATTIESBURG 5SW, MS US (USC00223887), 3.9 miles from the city point. Population in the Census 2024 estimate is 48,522.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 39406 (1.8 miles from the city point used on this page).

Median last 32°F is March 7. Median first 32°F is November 23. The 50% growing-season length is 261 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	February 14	Earlier date. A last 32°F on or after this day is common.
50%	March 7	Median.
10%	March 26	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	November 5	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 23	Median.
90%	December 14	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	290
50%	261
90%	234

28°F threshold

	10%	50%	90%
Last, on or after	March 16	February 20	January 26
First, on or before	November 14	December 4	January 6
Season at least	325 days	291 days	259 days

36°F threshold

	10%	50%	90%
Last, on or after	April 12	March 23	March 2
First, on or before	October 27	November 11	November 29
Season at least	260 days	233 days	208 days

Station HATTIESBURG 5SW, MS US (USC00223887). Completeness flag S, 27 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 117.3 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Hattiesburg, MS

Zone 8bAverage annual extreme minimum 15°F to 20°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Mississippi. Nearest qualified station: HATTIESBURG 5SW, MS US (USC00223887), 3.9 miles. Median last 32°F March 7. Median first 32°F November 23. The 50% growing-season length is 261 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 26	March 7	February 14
First 32°F on or before	November 5	November 23	December 14

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Mississippi are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

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