Frost dates / Alabama / Mobile

Frost dates in Mobile, AL

The station on this page is MOBILE DWTN AP, AL US (USW00013838), 3.7 miles from the city point. Population in the Census 2024 estimate is 201,367.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 36606 (0.1 miles from the city point used on this page).

Median last 32°F is February 21. Median first 32°F is December 6. The 50% growing-season length is 292 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%	January 25	Earlier date. A last 32°F on or after this day is common.
50%	February 21	Median.
10%	March 15	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 15	Earlier date. A first 32°F on or before this day is uncommon.
50%	December 6	Median.
90%	January 5	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%	326
50%	292
90%	257

28°F threshold

	10%	50%	90%
Last, on or after	March 6	February 2	January 2
First, on or before	November 30	December 30	January 30
Season at least	361 days	326 days	288 days

36°F threshold

	10%	50%	90%
Last, on or after	March 25	March 6	February 12
First, on or before	November 5	November 22	December 13
Season at least	294 days	264 days	236 days

Station MOBILE DWTN AP, AL US (USW00013838). Completeness flag S, 24 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 99.7%. Freeze dates are conditional on that threshold occurring. Elevation 7.9 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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Mobile, AL

Zone 9aAverage annual extreme minimum 20°F to 25°F

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

Alabama. Nearest qualified station: MOBILE DWTN AP, AL US (USW00013838), 3.7 miles. Median last 32°F February 21. Median first 32°F December 6. The 50% growing-season length is 292 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 15	February 21	January 25
First 32°F on or before	November 15	December 6	January 5

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 Alabama 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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