When is the last frost in Summerville, SC?

The average last spring frost (50% probability of 32°F) in Summerville is around March 22, based on NOAA/NCEI 1991–2020 normals at the Summerville 4w, SC station (0.5 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 Summerville?

The average first fall frost in Summerville, SC is around November 12, giving roughly a 238-day frost-free growing season.

What planting zone is Summerville, SC?

Summerville is in USDA plant hardiness zone 8b (average annual extreme minimum temperature 15 to 20°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Summerville?

In Summerville, SC the warmest month is July (avg high 90.1°F) and the coldest is January (avg low 34.5°F). It averages about 52.7″ of precipitation a year.

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Summerville, SC Planting Calendar & Frost Dates

USDA hardiness zone 8b · ZIP 29483 · elevation 20′ · NOAA & USDA data

Summerville is in USDA hardiness zone 8b (winters can dip to 15 to 20°F), with a growing season of about 238 days between the average last spring frost (March 22) and first fall frost (November 12). The warmest month is July (avg high 90.1°F); the coldest is January (avg low 34.5°F). It averages 52.7″ 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 15 to 20°F

Last spring frost

March 22

avg (50% prob, 32°F)

First fall frost

November 12

avg (50% prob, 32°F)

Growing season

238 days

frost-free window

Warmest month

July

avg high 90.1°F

Month-by-month typical weather in Summerville

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Summerville 4w, SC (0.5 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	58.2	34.5	46.4	3.6	–
February	61.9	37	49.4	3.3	–
March	68.5	42.2	55.4	3.9	–
April	75.6	49.5	62.6	3.5	–
May	82.3	59.1	70.7	3.5	–
June	87.2	67.2	77.2	5.6	–
July	90.1	70.9	80.5	6.8	–
August	89.7	70.4	80.1	6.2	–
September	84.7	64.8	74.8	5.9	–
October	76.6	53	64.8	4.1	–
November	67.7	42.2	54.9	3	–
December	61.3	37.4	49.3	3.4	–

What to plant when in Summerville

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 8 · Transplant out: March 29
Peppers	warm	Start seeds indoors: January 25 · Transplant out: April 5
Cucumbers	warm	Direct sow: March 29
Zucchini / squash	warm	Direct sow: March 29
Bush beans	warm	Direct sow: March 29
Sweet corn	warm	Direct sow: March 29
Basil	warm	Transplant out: March 29
Peas	cool	Sow (spring): February 15 · Sow (fall): September 17
Spinach	cool	Sow (spring): February 8 · Sow (fall): September 17
Lettuce	cool	Sow (spring): February 22 · Sow (fall): September 17
Kale	cool	Transplant (spring): March 1 · Sow (fall): September 3
Broccoli	cool	Transplant (spring): March 8
Carrots	cool	Sow (spring): March 1 · Sow (fall): September 3
Onions	cool	Transplant (spring): February 22
Potatoes	cool	Plant seed potatoes: March 8
Radishes	cool	Sow (spring): February 22 · Sow (fall): October 1

Dates are computed from Summerville'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

North Charleston, SC Goose Creek, SC Charleston, SC Mount Pleasant, SC Sumter, SC Hilton Head Island, SC Columbia, SC Florence, 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 — Summerville 4w, SC, 0.5 mi (confidence: high). Monthly weather normals: Summerville 4w, SC, 0.5 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.