Is it allergy season in South Carolina?

South Carolina's warm climate and long growing season produce one of the country's most extended allergy seasons, beginning as early as February in the Lowcountry near Charleston. Pine pollen — while not technically allergenic for most people — signals the onset of the true oak and grass season, and the visible yellow coating on cars is a reliable harbinger. Charleston consistently ranks among the Southeast's most challenging allergy cities.

South Carolina's 200-mile span from the Appalachian foothills in the northwest to the Atlantic coast creates meaningful seasonal variation. The Lowcountry near Charleston sees the earliest pollen onset and longest season. The Upstate around Greenville has a compressed but still intense season, with the Blue Ridge Mountains providing some elevation-related delays.

Lowcountry

Charleston and the earliest pollen season in the state

Charleston consistently ranks among the Southeast's most allergy-challenging cities. The warm coastal climate pushes oak pollen onset to February in warm years. The long growing season extends grass pollen into September. High humidity keeps pollen airborne longer.

Oak starts · Feb–MarPine visible · Mar–AprGrass · May–Sep (long)

Midlands

Columbia and the geographic center

Columbia sits in the state's geographic center, experiencing a season slightly shorter than Charleston but still among the Southeast's longest. Pine pollen is highly visible March–April. The city's position in a broad river basin can trap pollen on calm days.

Pine · Mar–AprOak · Mar–MayGrass · May–Aug

Grand Strand

Coastal sea breeze and year-round allergens

Myrtle Beach benefits from Atlantic sea breezes that can temporarily clear pollen during the day. However, the flat Coastal Plain offers no geographic barrier to pollen from inland agricultural areas. Bermuda grass from local golf courses contributes to summer grass counts.

Sea breeze dispersalBermuda grass · Jun–AugRagweed · Aug–Sep

Upstate

Greenville and the Blue Ridge foothills

Greenville and Spartanburg sit at the foot of the Blue Ridge Mountains. The slight elevation delays spring pollen by 1–2 weeks compared to Charleston. Oak is the dominant tree allergen. The Upstate's mixed forest creates diverse tree pollen, with pine, oak, and maple overlapping in spring.

Trees · Mar–MayElevation delays springRagweed · Aug–Sep

Each row shows a full year of pollen for one region — trees in blue, grasses in green, weeds in amber. Look for where all three rows go quiet at the same time — that's your window.

Oral Allergy Syndrome (also called pollen-food allergy syndrome) causes tingling or mild itching in the mouth when you eat certain raw foods during the relevant pollen season. The proteins in the food are similar enough to the pollen protein that your immune system cross-reacts. Cooking usually deactivates the offending protein, so the same food cooked may cause no reaction.

Oak pollen

Stone fruits & apples

Apples, peaches, cherries, plums, pears, almonds, hazelnuts, carrots, celery

Peak risk March–May. South Carolina's early, intense oak season is one of the Southeast's longest. Peeling fruit removes most of the cross-reactive protein.

Grass pollen

Tomatoes, potatoes & melons

Tomatoes, potatoes, kiwi, watermelon, cantaloupe, oranges (in some cases)

Peak risk May–August. Bermuda grass gives South Carolina one of the Southeast's longest grass seasons. The Coastal Plain's warm temperatures keep grass pollen active well into September.

Ragweed

Melons & bananas

Watermelon, cantaloupe, honeydew, banana, zucchini, cucumber, sunflower seeds

Peak risk August–September. Columbia and Charleston see significant ragweed counts. The warm coastal climate can push ragweed production through October.

Not medical advice. If you suspect OAS, speak with an allergist — it can sometimes progress, and symptoms that extend beyond the mouth should be evaluated.