Frost Dates for North Charleston, SC 29420

North Charleston has 3 ZIP codes. The North Charleston, SC frost page lists all of them with their dates.

Last spring frost March 9 · First fall frost November 25 · 261 frost-free days · USDA Zone 9a

Frost probability for 29420

Frost10%50%90%
Spring (last frost)April 3March 9February 13
Fall (first frost)November 6November 25December 4

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (6.6 km away); the 50% date is the median year.

Month by month in North Charleston

MonthWhat to do
JanuaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around March 9). Start tomatoes about two weeks later, 6–8 weeks before last frost.
FebruaryStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
MarchLast frost around March 9. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
AprilFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
MaySuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JuneHarvest regularly to encourage production. Monitor for pests and disease.
JulyMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
AugustDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
SeptemberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
OctoberFirst fall frost approaching (around November 25). Transplant fall brassicas. Sow spinach, arugula, and radishes.
NovemberFirst frost around November 25. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
DecemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.

What grows in a 261-day season

Frequently Asked Questions

What is the last frost date for North Charleston, SC (ZIP 29420)?

The median last spring frost date for North Charleston, SC (ZIP code 29420) is around March 9. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in North Charleston, SC?

The median first fall frost date for North Charleston, SC is around November 25. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in North Charleston, SC?

The frost-free growing season in North Charleston is about 261 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is North Charleston, SC?

Based on frost date patterns, North Charleston falls approximately in 9a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in North Charleston, SC?

Start tomato seeds indoors 6–8 weeks before your last frost date (around March 9). For North Charleston, that's roughly January 13 to January 27. Transplant outdoors 1–2 weeks after your last frost.

Nearby and related