NC · Allergy Season Guide
North Carolina Allergy Season Guide
North Carolina experiences a humid subtropical to humid continental climate with warm, humid summers and mild to cold winters.
Summary
North Carolina has 0 active PollyMap collection sites, and is seeking partners in 5 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 North Carolina
Statewide allergy overview
North Carolina experiences a humid subtropical to humid continental climate with warm, humid summers and mild to cold winters.
Oak, birch, cedar, maple, and pine drive a long March-through-May tree season. Grass pollen is heaviest in May and June, and ragweed extends through October.
High summer humidity and dense forest cover produce sustained high mold counts from June through frost.
Allergy patterns vary by elevation and proximity to coast or mountains within North 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.
North 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 | Low | Mod | V.High | V.High | High | Mod | Low | Low | Low | Low | Low | Low |
| Grass | — | Low | Mod | High | V.High | High | Mod | Low | Low | Low | — | — |
| Weed | Low | Low | Low | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Low | Mod | Mod | Mod | High | High | V.High | V.High | V.High | High | Mod | Low |
Top airborne molds
Major city guides in North Carolina
NC
Charlotte
View Charlotte allergy season guide →
NC
Raleigh
View Raleigh allergy season guide →
NC
Greensboro
View Greensboro allergy season guide →
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Durham
View Durham allergy season guide →
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Winston-Salem
View Winston-Salem allergy season guide →
Latest PollyMap reports for North Carolina
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Frequently asked questions
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