MO · Allergy Season Guide
Missouri Allergy Season Guide
Missouri experiences a humid continental climate with hot, humid summers and cold, snowy winters.
Summary
Missouri has 0 active PollyMap collection sites, and is seeking partners in 6 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 Missouri
Statewide allergy overview
Missouri 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 Missouri, but most of the state shares a common seasonal rhythm of spring tree pollen, summer grass pollen, and late-summer to fall weed pollen.
Missouri 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 Missouri
MO
Kansas City
View Kansas City allergy season guide →
MO
St. Louis
View St. Louis allergy season guide →
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Springfield
View Springfield allergy season guide →
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Columbia
View Columbia allergy season guide →
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Independence
View Independence allergy season guide →
Latest PollyMap reports for Missouri
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Frequently asked questions
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