Frost dates / Louisiana / Baton Rouge

Frost dates in Baton Rouge, LA

The station on this page is LSU BEN-HUR FARM, LA US (USC00165620), 5.6 miles from the city point. Population in the Census 2024 estimate is 220,907.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 70806 (0.8 miles from the city point used on this page).

Median last 32°F is February 28. Median first 32°F is November 26. The 50% growing-season length is 272 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 31	Earlier date. A last 32°F on or after this day is common.
50%	February 28	Median.
10%	March 21	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 6	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 26	Median.
90%	December 22	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%	309
50%	272
90%	240

28°F threshold

	10%	50%	90%
Last, on or after	March 10	February 7	January 7
First, on or before	November 20	December 16	January 16
Season at least	347 days	309 days	273 days

36°F threshold

	10%	50%	90%
Last, on or after	April 5	March 16	February 21
First, on or before	October 29	November 12	December 1
Season at least	272 days	242 days	212 days

Station LSU BEN-HUR FARM, LA US (USC00165620). 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 99.8%. Freeze dates are conditional on that threshold occurring. Elevation 6.4 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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Baton Rouge, LA

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

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

Louisiana. Nearest qualified station: LSU BEN-HUR FARM, LA US (USC00165620), 5.6 miles. Median last 32°F February 28. Median first 32°F November 26. The 50% growing-season length is 272 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 21	February 28	January 31
First 32°F on or before	November 6	November 26	December 22

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 Louisiana 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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