Frost dates / Alabama / Birmingham

Frost dates in Birmingham, AL

The station on this page is BIRMINGHAM AP, AL US (USW00013876), 4 miles from the city point. Population in the Census 2024 estimate is 196,357.

Zone 8aUSDA average annual extreme minimum 10°F to 15°F, from ZIP 35203 (1 miles from the city point used on this page).

Median last 32°F is March 21. Median first 32°F is November 11. The 50% growing-season length is 236 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 28	Earlier date. A last 32°F on or after this day is common.
50%	March 21	Median.
10%	April 8	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%	October 30	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 11	Median.
90%	December 1	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%	262
50%	236
90%	211

28°F threshold

	10%	50%	90%
Last, on or after	March 26	March 7	February 14
First, on or before	November 6	November 24	December 15
Season at least	293 days	262 days	235 days

36°F threshold

	10%	50%	90%
Last, on or after	April 20	April 3	March 16
First, on or before	October 21	November 2	November 17
Season at least	234 days	212 days	192 days

Station BIRMINGHAM AP, AL US (USW00013876). Completeness flag S, 28 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 187.5 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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Birmingham, AL

Zone 8aAverage annual extreme minimum 10°F to 15°F

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

Alabama. Nearest qualified station: BIRMINGHAM AP, AL US (USW00013876), 4 miles. Median last 32°F March 21. Median first 32°F November 11. The 50% growing-season length is 236 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 8	March 21	February 28
First 32°F on or before	October 30	November 11	December 1

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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