Frost dates / South Carolina / Mount Pleasant

Frost dates in Mount Pleasant, SC

The station on this page is SULLIVANS IS, SC US (USC00388405), 3.3 miles from the city point. Population in the Census 2024 estimate is 95,604.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 29464 (0.9 miles from the city point used on this page).

Median last 32°F is March 13. Median first 32°F is November 30. The 50% growing-season length is 262 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 19	Earlier date. A last 32°F on or after this day is common.
50%	March 13	Median.
10%	March 30	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 11	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 30	Median.
90%	December 24	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%	291
50%	262
90%	232

28°F threshold

	10%	50%	90%
Last, on or after	March 22	March 1	February 1
First, on or before	November 25	December 16	January 10
Season at least	320 days	288 days	259 days

36°F threshold

	10%	50%	90%
Last, on or after	April 10	March 25	March 6
First, on or before	November 1	November 16	December 5
Season at least	263 days	236 days	212 days

Station SULLIVANS IS, SC US (USC00388405). Completeness flag R, 24 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 1.5 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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Mount Pleasant, 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: SULLIVANS IS, SC US (USC00388405), 3.3 miles. Median last 32°F March 13. Median first 32°F November 30. The 50% growing-season length is 262 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 30	March 13	February 19
First 32°F on or before	November 11	November 30	December 24

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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