SC · Allergy Season Guide
South Carolina Allergy Season Guide
South Carolina experiences a humid subtropical climate with long, hot, humid summers and short, mild winters.
Summary
South Carolina has 0 active PollyMap collection sites, and is seeking partners in 7 additional cities. Tree pollen typically dominates early spring, grass pollen peaks in late spring and early summer, and weed pollen (including ragweed) extends from late summer through fall.
PollyMap collection status across South Carolina
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Test the air at your own home in South Carolina
No allergy clinic is reporting from South Carolina yet. Until one does, you can order your own PollyKit — a simple air sampler you hang outdoors or indoors. Send it back and the PollyKit Lab shows you exactly what's floating in your air.
- Pollen from local trees, grasses and weeds
- Airborne mold spores
- Dust mites and other indoor allergens
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Statewide allergy overview
South Carolina experiences a humid subtropical climate with long, hot, humid summers and short, mild winters.
Oak, pine, cedar, and pecan create an intense, early spring tree season — sometimes coating cars in yellow pine pollen by March. Bermuda and Bahia grass pollinate from late spring through fall, and ragweed dominates the late-summer weed load.
Year-round humidity makes the Southeast one of the highest mold-load regions in the country, with Cladosporium and Alternaria peaking after summer thunderstorms and tropical systems.
Allergy patterns vary by elevation and proximity to coast or mountains within South Carolina, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
South Carolina allergy calendar
Month-by-month intensity for the four major airborne allergen categories.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tree | Mod | High | V.High | V.High | High | Mod | Low | Low | Low | Low | Low | Mod |
| Grass | Low | Low | Mod | High | V.High | V.High | High | Mod | Mod | Low | Low | Low |
| Weed | Low | Low | Mod | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Mod | Mod | Mod | High | High | V.High | V.High | V.High | V.High | High | Mod | Mod |
Seasonal focus · Oct–Dec
October–December in South Carolina
Ragweed is South Carolina's main fall allergen, peaking in September and October from the Upstate to the coast. The state's warm, humid fall keeps mold spores active as well — damp leaf litter in the Midlands and Lowcountry is a reliable mold source through November.
Along the coast around Charleston and Myrtle Beach, the frost-free season runs long, so weed pollen and mold can persist well into November. December finally brings relief, but South Carolina's mild winters mean tree pollen returns early — often by February.
Top airborne molds
Major city guides in South Carolina
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Charleston
View Charleston allergy season guide →
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Columbia
View Columbia allergy season guide →
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North Charleston
View North Charleston allergy season guide →
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Mount Pleasant
View Mount Pleasant allergy season guide →
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Rock Hill
View Rock Hill allergy season guide →
Latest PollyMap reports for South Carolina
Frequently asked questions
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