Sullivans Is, SC Frost Dates & Growing Season

The two dates every Sullivans Is garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 13
~50% chance of frost after
First fall frost
Nov 30
~50% chance of frost before
Growing season
262 days
frost-free stretch
USDA zone
≈ 9a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Feb 19 Mar 13 Mar 30
First fall frost Dec 24 Nov 30 Nov 11
Hard freeze (28°F), median last Mar 1 · first Dec 16

Computed from NOAA 1991–2020 climate normals at the SULLIVANS IS station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Sullivans Is

Computed from Sullivans Is's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Jan 16 – Jan 30 Mar 20 – Mar 27
🫑 Peppers Jan 2 – Jan 16 Mar 27 – Apr 3
🥬 Lettuce Jan 30 – Feb 13 Feb 13 – Feb 27 Feb 13 – Mar 13
🫛 Peas Jan 30 – Feb 13
🥕 Carrots Feb 20 – Mar 13
🥦 Broccoli Jan 23 – Feb 6 Feb 20 – Mar 6
🥬 Kale Jan 30 – Feb 13 Feb 13 – Feb 27 Feb 13 – Feb 27
🥒 Cucumbers Feb 13 – Feb 20 Mar 20 – Mar 27 Mar 20 – Mar 27
🥒 Zucchini Feb 13 – Feb 20 Mar 20 – Mar 27 Mar 20 – Mar 27
🫘 Green Beans (Bush) Mar 20 – Mar 27
🌽 Sweet Corn Mar 20 – Mar 27
🌿 Basil Jan 30 – Feb 13 Mar 20 – Mar 27 Mar 27 – Apr 3
🧄 Garlic Fall: Oct 19 – Nov 16

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Sullivans Is's dates automatically after a lookup.

Reading the season in Sullivans Is

With roughly 262 frost-free days, Sullivans Is gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 30 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Sullivans Is, SC?

The average last spring frost in Sullivans Is is around Mar 13, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Sullivans Is, SC?

The average first fall frost in Sullivans Is arrives around Nov 30. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Sullivans Is?

About 262 frost-free days on average, from Mar 13 to Nov 30. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Sullivans Is in?

USDA zone 9a on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.