IN · Allergy Season Guide
Indiana Allergy Season Guide
Indiana experiences a humid continental climate with hot, humid summers and cold, snowy winters.
Summary
Indiana 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 Indiana
Statewide allergy overview
Indiana experiences a humid continental climate with hot, humid summers and cold, snowy winters.
Maple, birch, oak, and ash drive the spring tree season. Grass pollen peaks in late May and June, and ragweed dominates from mid-August through the first hard frost.
Heavy leaf litter, agricultural activity, and humid summers produce very high outdoor mold counts from late summer through fall.
Allergy patterns vary by elevation and proximity to coast or mountains within Indiana, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
Indiana 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 | High | V.High | V.High | High | Mod | Low | Low | Low | Low | Low |
| Grass | — | — | Low | Mod | High | V.High | High | Mod | Low | Low | — | — |
| Weed | Low | Low | Low | Mod | Mod | Mod | High | V.High | V.High | High | Mod | Low |
| Mold | Low | Low | Mod | Mod | High | High | V.High | V.High | V.High | High | Mod | Low |
Top weed pollens
Top airborne molds
Major city guides in Indiana
IN
Indianapolis
View Indianapolis allergy season guide →
IN
Fort Wayne
View Fort Wayne allergy season guide →
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Evansville
View Evansville allergy season guide →
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South Bend
View South Bend allergy season guide →
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Carmel
View Carmel allergy season guide →
Latest PollyMap reports for Indiana
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Frequently asked questions
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