Yes — Strong Match
sweet autumn clematis (zones 5-9) covers every zone South Carolina contains (7a-9b), so hardiness is not what limits it anywhere in the state.
Your yard isn't the whole zone.
South Carolina spans zones 7a-9b, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score sweet autumn clematis against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Sweet Autumn Clematis Needs
- USDA Zones: 5-9
- Frost-Free Days: 150+
- Sun: Full Sun
- Mature size: 25 ft tall
- Drought tolerance: Medium
South Carolina Has
- USDA Zones: 7a-9b
- Last Hard Freeze (28°F): Feb 27 - Mar 12
- First Hard Freeze (28°F): Nov 23 - Dec 1
- Annual Rainfall: 45-55 inches
- Common Soils: Red clay (Piedmont), Sandy loam (Coastal), Alluvial
Plant Zone Range (zones 5-9)
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Sweet Autumn Clematis in South Carolina
The frost window
Across South Carolina, the last spring hard freeze (28°F) clears between Feb 27 and Mar 12, and the first fall hard freeze lands between Nov 23 and Dec 1 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 256-day window you can count on — up to 277 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
South Carolina runs as cold as USDA zone 7, and no sourced winter-hardiness floor is on record for sweet autumn clematis, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether sweet autumn clematis is a permanent planting or a replant-every-spring crop for you turns on your own zone within South Carolina; check its hardiness range against that before treating it as long-lived ground.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
The zone check says sweet autumn clematis survives winter here. Whether the season is long enough — and warm enough — is a different question.
Frost-free days
Sweet Autumn Clematis wants 150+ frost-free days; a typical South Carolina site sees ~265 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
Growing degree days
Sweet Autumn Clematis needs ~2000 GDD (base 50°F) to ripen. The state median runs ~5233 GDD (from PRISM 1991-2020 climate normals), so South Carolina's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Sweet Autumn Clematis likes near-neutral soil (pH 5.5-7.5). That's the common-ground band across South Carolina's red clay (piedmont) and sandy loam (coastal) — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 6.5 and 7.5 — worth knowing before you decide whether a South Carolina soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your South Carolina site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. South Carolina soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Sweet Autumn Clematis in South Carolina — Quick Answer
- Verdict: Yes — Strong Match
- Plant Zones: 5-9 (USDA PLANTS Database)
- State Zones: 7a-9b (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Feb 27 - Mar 12 to Nov 23 - Dec 1 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Sweet Autumn Clematis in South Carolina
Zone compatibility tells you about winter cold survival — but South Carolina growers also need to think about:
Red Piedmont clay requires amendment for drainage
High heat and humidity promote diseases
Hurricane risk along the coast
What to actually do about these — and the constraints that apply to every South Carolina grower, not just sweet autumn clematis — is covered on the South Carolina growing guide.
Timing shifts within South Carolina
Sweet Autumn Clematis needs about 150 days of frost-free season to complete its cycle. Even Chester County — South Carolina’s shortest season at 237 frost-free days — clears that by 87 days, so season length isn’t the constraint anywhere in South Carolina. What varies is your own parcel.
Across South Carolina’s 46 counties the frost-free season runs from 237 days in Chester County to 320 days in Charleston County — a spread of 83 days, which is why a single statewide planting date misleads. The median South Carolina county sees 265 frost-free days, leaving sweet autumn clematis about 115 days of slack on a typical parcel — room for a second sowing where the season runs long.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Sweet Autumn Clematis's 150-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Where in South Carolina Fits Best
Even within South Carolina's zones 7a-9b, county microclimates differ enough to change what thrives. These counties carry the closest zone match for sweet autumn clematis (USDA PHZM 2023):
Pollinator + Wildlife Value
Sweet Autumn Clematis draws honeybees and native bees (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, sweet autumn clematis can only work that bloom inside South Carolina's frost window — roughly 265 days, opening after the last 28°F freeze (Feb 27 - Mar 12) and closing at the first (Nov 23 - Dec 1), per NOAA Regional Climate Centers ACIS, 1991-2020.
South Carolina Cooperative Extension
For South Carolina-specific cultivar recommendations, planting calendars, and pest pressure for sweet autumn clematis, the canonical source is Clemson Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Sweet Autumn Clematis native to South Carolina?
No — the USDA PLANTS Database lists Sweet Autumn Clematis as introduced rather than native in the Lower 48, so it is not part of South Carolina's native flora. It grows here as a garden plant; pairing it with a few South Carolina natives keeps local pollinators fed too.
Looking for plants that belong here? The South Carolina growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Sweet Autumn Clematis in South Carolina
When can I plant Sweet Autumn Clematis in South Carolina?
South Carolina's last spring hard freeze (28°F) clears between Feb 27 and Mar 12, and the first fall hard freeze lands between Nov 23 and Dec 1 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Sweet Autumn Clematis, so this page does not state whether it overwinters in South Carolina and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Sweet Autumn Clematis grown in across South Carolina?
South Carolina spans USDA hardiness zones 7a-9b (USDA ARS PHZM 2023). Sweet Autumn Clematis carries a range of zones 5-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical South Carolina site have?
A typical South Carolina site sees ~265 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Sweet Autumn Clematis needs 150+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Sweet Autumn Clematis native to South Carolina?
No — the USDA PLANTS Database lists Sweet Autumn Clematis as introduced rather than native in the Lower 48, so it is not part of South Carolina's native flora. It grows here as a garden plant; pairing it with a few South Carolina natives keeps local pollinators fed too.
How should I amend the soil for Sweet Autumn Clematis in South Carolina?
Sweet Autumn Clematis prefers pH 5.5-7.5 and well (dry spells) drainage (Growable Ground Plant Database). That sits in the common-ground band across South Carolina soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Sweet Autumn Clematis actually grow on my specific land in South Carolina?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores sweet autumn clematis against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in South Carolina
State-level data is a sketch. Your Growable Ground report scores sweet autumn clematis against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that South Carolina sweet autumn clematis averages can't show:
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Growing guides for sweet autumn clematis
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