LA · Allergy Season Guide
Louisiana Allergy Season Guide
Louisiana experiences a humid subtropical climate with long, hot, humid summers and short, mild winters.
Summary
Louisiana 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 Louisiana
While we find a local clinic
Test the air at your own home in Louisiana
No allergy clinic is reporting from Louisiana 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
Louisiana 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 Louisiana, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
Louisiana 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 Louisiana
Louisiana's warm, humid climate makes fall an active allergy season. Ragweed peaks from late summer through October, and the state's abundant moisture keeps outdoor mold spores — Alternaria and Cladosporium — elevated well into the cooler months. Fall rain and decaying vegetation add to mold counts.
Even in December, Louisiana rarely gets a full pollen break. The Gulf climate keeps mold active year-round, and tree pollen season begins early — often by January — so the gap between seasons is one of the shortest in the country.
Top airborne molds
Major city guides in Louisiana
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New Orleans
View New Orleans allergy season guide →
LA
Baton Rouge
View Baton Rouge allergy season guide →
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Shreveport
View Shreveport allergy season guide →
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Lafayette
View Lafayette allergy season guide →
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Lake Charles
View Lake Charles allergy season guide →
Latest PollyMap reports for Louisiana
Frequently asked questions
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