Frost dates / Louisiana / Bossier City

Frost dates in Bossier City, LA

The station on this page is SHREVEPORT DWTN AP, LA US (USW00053905), 5.4 miles from the city point. Population in the Census 2024 estimate is 63,218.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 71110 (2.2 miles from the city point used on this page).

Median last 32°F is February 28. Median first 32°F is November 24. The 50% growing-season length is 268 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 4	Earlier date. A last 32°F on or after this day is common.
50%	February 28	Median.
10%	March 19	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 7	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 24	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%	298
50%	268
90%	241

28°F threshold

	10%	50%	90%
Last, on or after	March 7	February 11	January 16
First, on or before	November 17	December 10	January 7
Season at least	337 days	304 days	269 days

36°F threshold

	10%	50%	90%
Last, on or after	April 3	March 14	February 24
First, on or before	October 31	November 12	November 29
Season at least	267 days	243 days	217 days

Station SHREVEPORT DWTN AP, LA US (USW00053905). Completeness flag R, 23 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 54.6 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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Bossier City, LA

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

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

Louisiana. Nearest qualified station: SHREVEPORT DWTN AP, LA US (USW00053905), 5.4 miles. Median last 32°F February 28. Median first 32°F November 24. The 50% growing-season length is 268 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 19	February 28	February 4
First 32°F on or before	November 7	November 24	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 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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