When is the last frost in Mount Pleasant, SC?

The average last spring frost (50% probability of 32°F) in Mount Pleasant is around March 13, based on NOAA/NCEI 1991–2020 normals at the Sullivans Is, SC station (4 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Mount Pleasant?

The average first fall frost in Mount Pleasant, SC is around November 30, giving roughly a 262-day frost-free growing season.

What planting zone is Mount Pleasant, SC?

Mount Pleasant is in USDA plant hardiness zone 9a (average annual extreme minimum temperature 20 to 25°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Mount Pleasant?

In Mount Pleasant, SC the warmest month is July (avg high 91.1°F) and the coldest is January (avg low 36.5°F). It averages about 51.6″ of precipitation a year.

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Mount Pleasant, SC Planting Calendar & Frost Dates

USDA hardiness zone 9a · ZIP 29464 · elevation 2′ · NOAA & USDA data

Mount Pleasant is in USDA hardiness zone 9a (winters can dip to 20 to 25°F), with a growing season of about 262 days between the average last spring frost (March 13) and first fall frost (November 30). The warmest month is July (avg high 91.1°F); the coldest is January (avg low 36.5°F). It averages 51.6″ of precipitation a year. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 20 to 25°F

Last spring frost

March 13

avg (50% prob, 32°F)

First fall frost

November 30

avg (50% prob, 32°F)

Growing season

262 days

frost-free window

Warmest month

July

avg high 91.1°F

Month-by-month typical weather in Mount Pleasant

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Sullivans Is, SC (4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	59.2	36.5	47.8	3.8	–
February	61.4	39	50.2	3.3	–
March	67.1	44.7	55.9	3.5	–
April	74.8	53.5	64.1	3.6	–
May	82.2	63.2	72.7	3.3	–
June	87.9	69.9	78.9	5.4	–
July	91.1	73	82	6	–
August	90	72	81	6.7	–
September	85.9	67.7	76.8	5.5	–
October	78.3	57.5	67.9	3.9	–
November	69.2	47	58.1	3	–
December	62.1	39.8	51	3.6	–

What to plant when in Mount Pleasant

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 30 · Transplant out: March 20
Peppers	warm	Start seeds indoors: January 16 · Transplant out: March 27
Cucumbers	warm	Direct sow: March 20
Zucchini / squash	warm	Direct sow: March 20
Bush beans	warm	Direct sow: March 20
Sweet corn	warm	Direct sow: March 20
Basil	warm	Transplant out: March 20
Peas	cool	Sow (spring): February 6 · Sow (fall): October 5
Spinach	cool	Sow (spring): January 30 · Sow (fall): October 5
Lettuce	cool	Sow (spring): February 13 · Sow (fall): October 5
Kale	cool	Transplant (spring): February 20 · Sow (fall): September 21
Broccoli	cool	Transplant (spring): February 27
Carrots	cool	Sow (spring): February 20 · Sow (fall): September 21
Onions	cool	Transplant (spring): February 13
Potatoes	cool	Plant seed potatoes: February 27
Radishes	cool	Sow (spring): February 13 · Sow (fall): October 19

Dates are computed from Mount Pleasant's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in South Carolina

Charleston, SC Goose Creek, SC North Charleston, SC Summerville, SC Hilton Head Island, SC Sumter, SC Florence, SC Columbia, SC

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Sullivans Is, SC, 4 mi (confidence: high). Monthly weather normals: Sullivans Is, SC, 4 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.