Iowa pollen and allergy seasons
July outlookModerate
Iowa has a spring tree season and a very heavy ragweed season across its farmland in late summer.
Twelve month pollen calendar
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F
M
A
M
J
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A
S
O
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D
LowModerateHighVery high
Dominant species in July
Grass
Typical peak in July
No clear peak this month
Worst month of the year
September
Best month of the year
January
What is active in July
Grass
Cities in Iowa
| City | Today | Worst today | Typical in July |
|---|---|---|---|
| Sioux City | Very Highas of Jul 15 | Grass | Moderate |
| Council Bluffs | Very Highas of Jul 15 | Grass | Moderate |
| Le Mars | Very Highas of Jul 15 | Grass | Moderate |
| Hull | Very Highas of Jul 15 | Grass | Moderate |
| Missouri Valley | Very Highas of Jul 15 | Grass | Moderate |
| Orange City | Highas of Jul 15 | Grass | Moderate |
| Honey Creek | Highas of Jul 15 | Grass | Moderate |
| Underwood | Highas of Jul 15 | Grass | Moderate |
| Logan | Moderateas of Jul 15 | Grass | Moderate |
| Dunlap | Moderateas of Jul 15 | Grass | Moderate |
| Tabor | Moderateas of Jul 15 | Grass | Moderate |
| Avoca | Moderateas of Jul 15 | Grass | Moderate |
| Des Moines | Noneas of Jul 15 | None | Moderate |
| Cedar Rapids | Noneas of Jul 15 | None | Moderate |
| Iowa City | Noneas of Jul 15 | None | Moderate |
| Waterloo | Noneas of Jul 15 | None | Moderate |
| Ankeny | Noneas of Jul 15 | None | Moderate |
| West Des Moines | Noneas of Jul 15 | None | Moderate |
| Dubuque | Noneas of Jul 15 | None | Moderate |
| Ames | Noneas of Jul 15 | None | Moderate |
| Marion | Noneas of Jul 15 | None | Moderate |
| Bettendorf | Noneas of Jul 15 | None | Moderate |
| Marshalltown | Noneas of Jul 15 | None | Moderate |
| Mason City | Noneas of Jul 15 | None | Moderate |
| Waukee | Noneas of Jul 15 | None | Moderate |
| Fort Dodge | Noneas of Jul 15 | None | Moderate |
| Clinton | Noneas of Jul 15 | None | Moderate |
| Johnston | Noneas of Jul 15 | None | Moderate |
| Burlington | Noneas of Jul 15 | None | Moderate |
| Muscatine | Noneas of Jul 15 | None | Moderate |
| Coralville | Noneas of Jul 15 | None | Moderate |
| North Liberty | Noneas of Jul 15 | None | Moderate |
| Altoona | Noneas of Jul 15 | None | Moderate |
| Clive | Noneas of Jul 15 | None | Moderate |
| Indianola | Noneas of Jul 15 | None | Moderate |
| Grimes | Noneas of Jul 15 | None | Moderate |
| Norwalk | Noneas of Jul 15 | None | Moderate |
| Boone | Noneas of Jul 15 | None | Moderate |
| Oskaloosa | Noneas of Jul 15 | None | Moderate |
| Spencer | Noneas of Jul 15 | None | Moderate |
| Storm Lake | Noneas of Jul 15 | None | Moderate |
| Fayette | Noneas of Jul 15 | None | Moderate |
| Center Point | Noneas of Jul 15 | None | Moderate |
| Forest City | Noneas of Jul 15 | None | Moderate |
| Hiawatha | Noneas of Jul 15 | None | Moderate |
| Polk City | Noneas of Jul 15 | None | Moderate |
| Battle Creek | Noneas of Jul 15 | None | Moderate |
| Rolfe | Noneas of Jul 15 | None | Moderate |
| Dyersville | Noneas of Jul 15 | None | Moderate |
| Sanborn | Noneas of Jul 15 | None | Moderate |
| Rockford | Noneas of Jul 15 | None | Moderate |
| Colo | Noneas of Jul 15 | None | Moderate |
| Tiffin | Noneas of Jul 15 | None | Moderate |
| Clear Lake | Noneas of Jul 15 | None | Moderate |
| Brooklyn | Noneas of Jul 15 | None | Moderate |
| Jesup | Noneas of Jul 15 | None | Moderate |
| Monona | Noneas of Jul 15 | None | Moderate |
| Perry | Noneas of Jul 15 | None | Moderate |
| Story City | Noneas of Jul 15 | None | Moderate |
| Fairfield | Noneas of Jul 15 | None | Moderate |
| Ridgeway | Noneas of Jul 15 | None | Moderate |
| Decorah | Noneas of Jul 15 | None | Moderate |
| Anamosa | Noneas of Jul 15 | None | Moderate |
| Humboldt | Noneas of Jul 15 | None | Moderate |
| Deep River | Noneas of Jul 15 | None | Moderate |
| What Cheer | Noneas of Jul 15 | None | Moderate |
| Cherokee | Noneas of Jul 15 | None | Moderate |
| Clarence | Noneas of Jul 15 | None | Moderate |
| Martelle | Noneas of Jul 15 | None | Moderate |
| Winterset | Noneas of Jul 15 | None | Moderate |
| Waverly | Noneas of Jul 15 | None | Moderate |
| Runnells | Noneas of Jul 15 | None | Moderate |
| Nevada | Noneas of Jul 15 | None | Moderate |
| Monticello | Noneas of Jul 15 | None | Moderate |
| Grand Junction | Noneas of Jul 15 | None | Moderate |
| Peosta | Noneas of Jul 15 | None | Moderate |
| Eldridge | Noneas of Jul 15 | None | Moderate |
| Long Grove | Noneas of Jul 15 | None | Moderate |
| Clarinda | Noneas of Jul 15 | None | Moderate |
| Cumming | Noneas of Jul 15 | None | Moderate |
| Dahlonega | Noneas of Jul 15 | None | Moderate |
| Ollie | Noneas of Jul 15 | None | Moderate |
| West Liberty | Noneas of Jul 15 | None | Moderate |
| Pella | Noneas of Jul 15 | None | Moderate |
| Ackworth | Noneas of Jul 15 | None | Moderate |
| Hazleton | Noneas of Jul 15 | None | Moderate |
| New Hampton | Noneas of Jul 15 | None | Moderate |
| Cascade | Noneas of Jul 15 | None | Moderate |
| Gilbert | Noneas of Jul 15 | None | Moderate |
| Vail | Noneas of Jul 15 | None | Moderate |
| Grinnell | Noneas of Jul 15 | None | Moderate |
| Carroll | Noneas of Jul 15 | None | Moderate |
| Remsen | Noneas of Jul 15 | None | Moderate |
| Kalona | Noneas of Jul 15 | None | Moderate |
| Kanawha | Noneas of Jul 15 | None | Moderate |
| Ogden | Noneas of Jul 15 | None | Moderate |
| Dysart | Noneas of Jul 15 | None | Moderate |
| Davenport | No live reading | Not available | Moderate |
| Urbandale | No live reading | Not available | Moderate |
| Cedar Falls | No live reading | Not available | Moderate |
| Ottumwa | No live reading | Not available | Moderate |
| Newton | No live reading | Not available | Moderate |
| Harlan | No live reading | Not available | Moderate |
| Nora Springs | No live reading | Not available | Moderate |
| Stratford | No live reading | Not available | Moderate |
| Reinbeck | No live reading | Not available | Moderate |
| Charles City | No live reading | Not available | Moderate |
| Villisca | No live reading | Not available | Moderate |
| Nichols | No live reading | Not available | Moderate |
| Eddyville | No live reading | Not available | Moderate |
| Belmond | No live reading | Not available | Moderate |
| Homestead | No live reading | Not available | Moderate |
Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.
The Iowa allergy season
Allergy levels in Iowa peak in September, when ragweed pollen runs highest. The season moves through tree pollen around April, grass in June, weed pollen such as ragweed in September. Levels start to climb around March. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in Iowa?
Pollen levels in Iowa usually begin climbing in March and reach their highest point in September.
What is the worst month for allergies in Iowa?
September is typically the worst month in Iowa, driven by ragweed pollen.
When does ragweed season end in Iowa?
Ragweed pollen in Iowa usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Iowa?
January usually brings the lowest pollen levels of the year in Iowa.