Hilton Head, SC Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Hilton Head, South Carolina.
Gardening in Hilton Head
The resort island's subtropical climate grows food nearly year-round. Behind the gated communities, Gullah-Geechee heritage gardens connect to centuries of coastal food growing.
Zone 9a with 270 frost-free days. Maritime moderation, sandy soil, and salt spray define island gardening. The Lowcountry's longest growing season supports tropical experiments.
Hilton Head's Gullah-Geechee heritage includes food-growing traditions brought from West Africa and adapted to the Sea Islands over centuries.
What This Means for Hilton Head Gardeners
The average last spring frost in Hilton Head is around February 25, and the average first fall frost arrives around November 22. That gives you approximately 270 frost-free days to work with.
270 days is a long, productive season that supports two full rounds of warm-season crops plus continuous cool-season production through your mild winter. Most frost-sensitive crops can be transplanted by February 25, giving them months to produce before fall. Your winter garden is the real advantage — growing fresh vegetables in December and January while northern gardeners browse seed catalogs.
These dates are based on NOAA 30-year Climate Normal data for the Hilton Head area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in Hilton Head
Hilton Head's 270-day growing season is generous — long enough for two full growing windows (spring and fall) with warm-season crops between them. You can grow the full range of vegetables, herbs, and flowers with proper timing. Focus on heat-tolerant varieties for midsummer and cool-season crops for extended fall harvests. Recommended starting points: tomatoes, peppers, beans, cucumbers, squash, garlic, kale, and sunflowers.
See the full South Carolina planting guide for all 40 plants: South Carolina Planting Calendar. Or enter your zip code for exact planting dates personalized to Hilton Head.
More About Zone 9A
Hilton Head is in USDA Hardiness Zone 9A, which means average annual extreme minimum temperatures between 20°F to 25°F. View the full Zone 9A planting guide.
See the complete planting calendar for South Carolina: South Carolina Planting Calendar.
Other Cities in South Carolina
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Hilton Head area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within Hilton Head (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Cool-season crops go in 3-4 weeks before your last frost (February 25). Warm-season crops wait until 2 weeks after. You have time for a fall round too — plant cool-season crops again in late summer for harvest into autumn. Enter your zip code for exact dates.