South Carolina Nature Guide: September 2026
September is the great turn toward fall in South Carolina — songbird migration peaks in the maritime forests, the Lowcountry sweetgrass plumes silver, the markets shift to muscadines and the fall harvest, and the first cool fronts ease the heat. Hurricane season runs at its peak through the month.
What to look for this week
- Tundra Swans and rafts of ducks crowd the ACE Basin impoundments at their winter peak, while Lowcountry Christmas Bird Counts wrap up across the state.
- The Quadrantid meteor shower peaks in a short, sharp burst around January 3 — best after midnight from a dark Upstate ridge at Caesars Head or the unlit ACE Basin marshes.
- A planning week in the cold Upstate, but Lowcountry cold frames keep collards and kale growing — order seeds early before favorites sell out.
Birds This Month
September is peak fall songbird migration in South Carolina, and the coast is the place to be. The maritime forests and live-oak hammocks of Huntington Beach State Park, Hunting Island, and the barrier islands fill with southbound migrants — American Redstart, Black-and-white, Northern Parula, Cape May, Black-throated Blue, Magnolia, and Prairie Warblers, plus vireos, tanagers, Rose-breasted Grosbeaks, and flycatchers staging before the push south. Ruby-throated Hummingbirds stream through in numbers — keep the feeders full.
Shorebird migration peaks on the coast, with the impoundments and mudflats at the ACE Basin and Huntington Beach crowded with dowitchers, yellowlegs, peeps, plovers, and the chance of rarer species. Swallow-tailed Kites depart for South America early in the month, and Common Nighthawks stream south in evening flights. Hawk migration builds toward the Upstate's Caesars Head watch, where Broad-winged Hawks begin to pass in growing numbers. Bobolinks ripple through the coastal marshes, and the first wintering sparrows arrive late in the month.
What's Blooming
September is the peak of South Carolina's fall wildflower bloom — the great season of goldenrods and asters. The Piedmont and Sandhills old fields, roadsides, and powerline cuts blaze with goldenrod, blazing star (Liatris), ironweed, Joe-Pye weed, mistflower, sneezeweed, partridge pea, and a wealth of native asters in white, blue, and purple — a critical nectar source for migrating monarchs and butterflies.
In wet ground, cardinal flower, swamp sunflower, swamp milkweed, and rose mallow bloom along the swamps and ditches. The longleaf savannas hold their late-season specialties — gentians, pine-barren goldenrods, and orchids. Along the coast, the signature fall sight arrives: the sweetgrass of the dunes and marsh edges plumes silver-pink in the maritime grasslands, the plant of Gullah-Geechee basketry, and the salt marshes flush with the yellow sea oxeye and saltmarsh aster. Gardens hold lantana, salvia, zinnia, and the beautyberry heavy with brilliant purple fruit.
Garden This Month
September is one of the most productive planting months of the South Carolina year, as the heat breaks and the long, mild fall season opens. The fall garden goes in fully now — direct-sow spinach, lettuce, arugula, radishes, turnips, carrots, beets, mustard greens, and kale, and set out transplants of broccoli, cabbage, cauliflower, collards, and Brussels sprouts for a generous fall and winter harvest. The cooling weather makes these crops thrive where the summer heat would have wilted them.
The last summer crops finish — pick the final okra, peppers, eggplant, southern peas, sweet potatoes, and tomatoes — and a second flush from August-planted squash, beans, and cucumbers comes in along the coast. Plant garlic and multiplying onions toward month's end, and put in cool-season flowers like pansies and snapdragons. Water new plantings well, watch for fall armyworms and cabbage loopers on the young greens, and keep beds weeded. This is also a fine month to plant trees, shrubs, and perennials so their roots establish through the mild fall and winter.
Zone 7b (Upstate & foothills): the fall garden grows fast in the cooling weather. Direct-sow spinach, lettuce, radishes, turnips, and a final round of greens, set out remaining cool-season transplants, and plant garlic and spring bulbs toward month's end.
Zone 8a (Midlands & Sandhills): prime fall planting. Sow leafy greens, spinach, lettuce, carrots, beets, and radishes, set out broccoli, cabbage, collards, and kale, and harvest the last summer crops and the first fall greens.
Zone 8b (lower Coastal Plain & Lowcountry): the long fall garden thrives. Keep sowing greens, root crops, and lettuces in succession, set out all cool-season transplants, and enjoy a second flush of squash, beans, and cucumbers from August plantings.
What's at the Farmers Market
September markets in South Carolina turn toward fall flavors. Muscadines and scuppernongs — the native thick-skinned Southern grapes — come into full season, alongside the last peaches, figs, and watermelon, and the first apples from the Upstate. The vegetable tables hold the late summer crops — tomatoes, okra, peppers, eggplant, butterbeans, field peas, sweet potatoes, and winter squash — alongside the first fall greens and lettuces.
On the coast, Lowcountry shrimp runs strong, with the larger fall shrimp coming in. Cut flowers, herbs, local honey, boiled peanuts, and the first pumpkins appear at the markets in Charleston, Columbia, Greenville, Beaufort, and the Pee Dee. Choose muscadines plump, dry, and unbruised and refrigerate them, using within several days. Pick figs soft and fully colored for immediate use, choose sweet potatoes firm and store them cool and dry but never refrigerated, and buy shrimp firm and translucent, keeping it iced.
Night Sky This Month
South Carolina's September skies grow clearer and steadier as the humid summer air gives way to cool fronts. The darkest viewing remains in the Upstate at Caesars Head and Table Rock State Park, over the ACE Basin marshes, and along the unlit beaches at Huntington Beach State Park, where regional clubs hold fall star parties on crisp clear nights. The autumn equinox near September 22 evens day and night.
The sky is in transition. The summer Milky Way and the Summer Triangle still ride high in the early evening, while the autumn constellations climb in the east — the Great Square of Pegasus, and below it the Andromeda Galaxy, the most distant object easily visible to the naked eye from a dark site, a soft glow in Andromeda. September has no major meteor shower, making it a fine month for deep-sky observing of the Milky Way clusters and the Andromeda Galaxy as the cool, transparent autumn air arrives. The printable South Carolina night-sky guide gives this year's planet positions and the best dark-sky sites for fall.
Butterflies & Pollinators
September brings one of South Carolina's great butterfly events — the start of the monarch's fall migration. The migratory generation streams south through the state, building toward the October peak; the coast and the goldenrod-and-aster fields are the best places to watch them nectaring on their way to Mexico. Cloudless sulphurs also stream south in big numbers, a steady yellow procession along roadsides and fields.
Butterfly numbers stay high on the late flowers. Gulf fritillaries are at peak on the passionflower and lantana, joined by common buckeyes, painted and American ladies, sleepy and orange sulphurs, fiery and ocola skippers, and the big swallowtails still on the wing. In the coastal Lowcountry, southern strays like the long-tailed skipper and the occasional little metalmark turn up. Watch the blooming goldenrod, aster, ironweed, and lantana for swarms of nectaring butterflies — these fall flowers are the fuel of the migration. Keep nectar sources blooming and avoid cutting back the goldenrod and asters that the monarchs depend on.
Trees This Month
September begins the slow turn of South Carolina's fall, earliest among the wetland and pioneer species. The black gum (tupelo) leads with brilliant early scarlet, the sumacs flame red along the roadsides, the sweetgum begins to show its mixed purple and gold, and the first red maples in wet ground start to color. The dogwood reddens and hangs its glossy red fruit.
The fruits and mast ripen heavily now. The oaks drop their acorns, the hickories and pecans set their nuts, the native persimmon softens its orange fruit after the first cool nights, the beautyberry hangs heavy with purple, and the cabbage palmetto (the state tree) ripens black drupes that feed migrating songbirds. Along the coast the live oaks, southern magnolia, and wax myrtle hold their evergreen Lowcountry green, and the bald cypress in the swamps just begins to bronze. The Upstate canopy is still mostly green but cooling toward the great October color show on the Blue Ridge escarpment.
Go deeper with the South Carolina guides
The complete South Carolina birding, native-plant, wildflower, and night-sky guides — or the whole year in one bundle.
Same month elsewhere: September in South Dakota · September in Tennessee · September in Texas