Frost dates / South Carolina / Summerville

Frost dates in Summerville, SC

The station on this page is SUMMERVILLE 4W, SC US (USC00388426), 3.7 miles from the city point. Population in the Census 2024 estimate is 52,625.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 29483 (3.6 miles from the city point used on this page).

Median last 32°F is March 22. Median first 32°F is November 12. The 50% growing-season length is 238 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%	March 1	Earlier date. A last 32°F on or after this day is common.
50%	March 22	Median.
10%	April 7	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 29	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 12	Median.
90%	December 3	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%	266
50%	238
90%	213

28°F threshold

	10%	50%	90%
Last, on or after	March 28	March 7	February 10
First, on or before	November 7	November 29	December 28
Season at least	301 days	265 days	235 days

36°F threshold

	10%	50%	90%
Last, on or after	April 19	April 3	March 16
First, on or before	October 19	November 3	November 18
Season at least	238 days	213 days	192 days

Station SUMMERVILLE 4W, SC US (USC00388426). Completeness flag R, 22 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 19.8 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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Summerville, SC

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

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

South Carolina. Nearest qualified station: SUMMERVILLE 4W, SC US (USC00388426), 3.7 miles. Median last 32°F March 22. Median first 32°F November 12. The 50% growing-season length is 238 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 7	March 22	March 1
First 32°F on or before	October 29	November 12	December 3

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.

Date checks use your device’s calendar and appear after the page loads.