Frost dates / South Carolina / North Charleston

Frost dates in North Charleston, SC

The station on this page is CHARLESTON INTL AP, SC US (USW00013880), 2 miles from the city point. Population in the Census 2024 estimate is 126,005.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 29404 (1.6 miles from the city point used on this page).

Median last 32°F is March 7. Median first 32°F is November 27. The 50% growing-season length is 266 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 12	Earlier date. A last 32°F on or after this day is common.
50%	March 7	Median.
10%	March 27	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 8	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 27	Median.
90%	December 21	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%	266
90%	238

28°F threshold

	10%	50%	90%
Last, on or after	March 14	February 20	January 21
First, on or before	November 21	December 15	January 13
Season at least	334 days	301 days	267 days

36°F threshold

	10%	50%	90%
Last, on or after	April 6	March 21	February 28
First, on or before	November 1	November 13	December 1
Season at least	266 days	239 days	217 days

Station CHARLESTON INTL AP, SC US (USW00013880). Completeness flag S, 30 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 12.2 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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North Charleston, SC

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

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

South Carolina. Nearest qualified station: CHARLESTON INTL AP, SC US (USW00013880), 2 miles. Median last 32°F March 7. Median first 32°F November 27. The 50% growing-season length is 266 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 27	March 7	February 12
First 32°F on or before	November 8	November 27	December 21

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 South Carolina 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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