Illinois pollen and allergy seasons
August outlookHigh
Illinois has a spring tree season and one of the heavier ragweed seasons in the country in late summer.
Twelve month pollen calendar
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LowModerateHighVery high
Dominant species in August
Ragweed
Typical peak in August
mid-August to late-August
Worst month of the year
September
Best month of the year
January
What is active in August
Ragweed
Mugwort
Cities in Illinois
| City | Today | Worst today | Typical in August |
|---|---|---|---|
| Chicago | Moderateas of Aug 8 | Grass | High |
| Alton | Moderateas of Aug 8 | Grass | High |
| Schaumburg | Moderateas of Aug 8 | Grass | High |
| Evanston | Moderateas of Aug 8 | Grass | High |
| Arlington Heights | Moderateas of Aug 8 | Grass | High |
| Palatine | Moderateas of Aug 8 | Grass | High |
| Skokie | Moderateas of Aug 8 | Grass | High |
| Des Plaines | Moderateas of Aug 8 | Grass | High |
| Oak Lawn | Moderateas of Aug 8 | Grass | High |
| Tinley Park | Moderateas of Aug 8 | Grass | High |
| Oak Park | Moderateas of Aug 8 | Grass | High |
| Belleville | Moderateas of Aug 8 | Grass | High |
| Romeoville | Moderateas of Aug 8 | Grass | High |
| Crystal Lake | Moderateas of Aug 8 | Grass | High |
| Park Ridge | Moderateas of Aug 8 | Grass | High |
| Carpentersville | Moderateas of Aug 8 | Grass | High |
| Glendale Heights | Moderateas of Aug 8 | Grass | High |
| Oak Forest | Moderateas of Aug 8 | Grass | High |
| Vernon Hills | Moderateas of Aug 8 | Grass | High |
| Batavia | Moderateas of Aug 8 | Grass | High |
| Granite City | Moderateas of Aug 8 | Grass | High |
| West Chicago | Moderateas of Aug 8 | Grass | High |
| Westmont | Moderateas of Aug 8 | Grass | High |
| Rolling Meadows | Moderateas of Aug 8 | Grass | High |
| Blue Island | Moderateas of Aug 8 | Grass | High |
| Maywood | Moderateas of Aug 8 | Grass | High |
| Villa Park | Moderateas of Aug 8 | Grass | High |
| Darien | Moderateas of Aug 8 | Grass | High |
| Park Forest | Moderateas of Aug 8 | Grass | High |
| Lake Zurich | Moderateas of Aug 8 | Grass | High |
| Evergreen Park | Moderateas of Aug 8 | Grass | High |
| Lake Forest | Moderateas of Aug 8 | Grass | High |
| Matteson | Moderateas of Aug 8 | Grass | High |
| Bellwood | Moderateas of Aug 8 | Grass | High |
| Godfrey | Moderateas of Aug 8 | Grass | High |
| Bridgeview | Moderateas of Aug 8 | Grass | High |
| Norridge | Moderateas of Aug 8 | Grass | High |
| Antioch | Moderateas of Aug 8 | Grass | High |
| Chicago Ridge | Moderateas of Aug 8 | Grass | High |
| Shiloh | Moderateas of Aug 8 | Grass | High |
| Midlothian | Moderateas of Aug 8 | Grass | High |
| Forest Park | Moderateas of Aug 8 | Grass | High |
| Western Springs | Moderateas of Aug 8 | Grass | High |
| Richton Park | Moderateas of Aug 8 | Grass | High |
| Northlake | Moderateas of Aug 8 | Grass | High |
| Markham | Moderateas of Aug 8 | Grass | High |
| Burr Ridge | Moderateas of Aug 8 | Grass | High |
| East Saint Louis | Moderateas of Aug 8 | Grass | High |
| Cottage Hills | Moderateas of Aug 8 | Grass | High |
| Riverside | Moderateas of Aug 8 | Grass | High |
| Lake Villa | Moderateas of Aug 8 | Grass | High |
| Itasca | Moderateas of Aug 8 | Grass | High |
| Jerseyville | Moderateas of Aug 8 | Grass | High |
| Elwood | Moderateas of Aug 8 | Grass | High |
| Willowbrook | Moderateas of Aug 8 | Grass | High |
| Hometown | Moderateas of Aug 8 | Grass | High |
| Bunker Hill | Moderateas of Aug 8 | Grass | High |
| Freeburg | Moderateas of Aug 8 | Grass | High |
| Baylis | Moderateas of Aug 8 | Grass | High |
| Rosemont | Moderateas of Aug 8 | Grass | High |
| Troy | Moderateas of Aug 8 | Grass | High |
| Moro | Moderateas of Aug 8 | Grass | High |
| Joliet | Lowas of Aug 8 | Grass | High |
| Elgin | Lowas of Aug 8 | Grass | High |
| Waukegan | Lowas of Aug 8 | Grass | High |
| Cicero | Lowas of Aug 8 | Grass | High |
| Bolingbrook | Lowas of Aug 8 | Grass | High |
| Mount Prospect | Lowas of Aug 8 | Grass | High |
| Hoffman Estates | Lowas of Aug 8 | Grass | High |
| Downers Grove | Lowas of Aug 8 | Grass | High |
| Elmhurst | Lowas of Aug 8 | Grass | High |
| Lombard | Lowas of Aug 8 | Grass | High |
| Buffalo Grove | Lowas of Aug 8 | Grass | High |
| Bartlett | Lowas of Aug 8 | Grass | High |
| Carol Stream | Lowas of Aug 8 | Grass | High |
| Streamwood | Lowas of Aug 8 | Grass | High |
| Wheeling | Lowas of Aug 8 | Grass | High |
| Hanover Park | Lowas of Aug 8 | Grass | High |
| Calumet City | Lowas of Aug 8 | Grass | High |
| Northbrook | Lowas of Aug 8 | Grass | High |
| Woodridge | Lowas of Aug 8 | Grass | High |
| St. Charles | Lowas of Aug 8 | Grass | High |
| O'fallon | Lowas of Aug 8 | Grass | High |
| Mundelein | Lowas of Aug 8 | Grass | High |
| North Chicago | Lowas of Aug 8 | Grass | High |
| Gurnee | Lowas of Aug 8 | Grass | High |
| Niles | Lowas of Aug 8 | Grass | High |
| Highland Park | Lowas of Aug 8 | Grass | High |
| Algonquin | Lowas of Aug 8 | Grass | High |
| Glen Ellyn | Lowas of Aug 8 | Grass | High |
| Huntley | Lowas of Aug 8 | Grass | High |
| Mchenry | Lowas of Aug 8 | Grass | High |
| Wilmette | Lowas of Aug 8 | Grass | High |
| New Lenox | Lowas of Aug 8 | Grass | High |
| Edwardsville | Lowas of Aug 8 | Grass | High |
| Homer Glen | Lowas of Aug 8 | Grass | High |
| Zion | Lowas of Aug 8 | Grass | High |
| Elmwood Park | Lowas of Aug 8 | Grass | High |
| Roselle | Lowas of Aug 8 | Grass | High |
| Geneva | Lowas of Aug 8 | Grass | High |
| Montgomery | Lowas of Aug 8 | Grass | High |
| Dolton | Lowas of Aug 8 | Grass | High |
| Frankfort | Lowas of Aug 8 | Grass | High |
| Mokena | Lowas of Aug 8 | Grass | High |
| Harvey | Lowas of Aug 8 | Grass | High |
| Homewood | Lowas of Aug 8 | Grass | High |
| Deerfield | Lowas of Aug 8 | Grass | High |
| Alsip | Lowas of Aug 8 | Grass | High |
| Round Lake | Lowas of Aug 8 | Grass | High |
| Bensenville | Lowas of Aug 8 | Grass | High |
| Palos Hills | Lowas of Aug 8 | Grass | High |
| Cary | Lowas of Aug 8 | Grass | High |
| Lemont | Lowas of Aug 8 | Grass | High |
| Jacksonville | Lowas of Aug 8 | Grass | High |
| Cahokia Heights | Lowas of Aug 8 | Grass | High |
| Westchester | Lowas of Aug 8 | Grass | High |
| Country Club Hills | Lowas of Aug 8 | Grass | High |
| Fairview Heights | Lowas of Aug 8 | Grass | High |
| Prospect Heights | Lowas of Aug 8 | Grass | High |
| Warrenville | Lowas of Aug 8 | Grass | High |
| Wauconda | Lowas of Aug 8 | Grass | High |
| Beach Park | Lowas of Aug 8 | Grass | High |
| Channahon | Lowas of Aug 8 | Grass | High |
| Glen Carbon | Lowas of Aug 8 | Grass | High |
| Hazel Crest | Lowas of Aug 8 | Grass | High |
| La Grange Park | Lowas of Aug 8 | Grass | High |
| River Forest | Lowas of Aug 8 | Grass | High |
| Schiller Park | Lowas of Aug 8 | Grass | High |
| Clarendon Hills | Lowas of Aug 8 | Grass | High |
| Millstadt | Lowas of Aug 8 | Grass | High |
| Spring Grove | Lowas of Aug 8 | Grass | High |
| Long Grove | Lowas of Aug 8 | Grass | High |
| Maryville | Lowas of Aug 8 | Grass | High |
| Barrington | Lowas of Aug 8 | Grass | High |
| Crete | Lowas of Aug 8 | Grass | High |
| Girard | Lowas of Aug 8 | Grass | High |
| Palos Park | Lowas of Aug 8 | Grass | High |
| Steger | Lowas of Aug 8 | Grass | High |
| Lake Bluff | Lowas of Aug 8 | Grass | High |
| Dupo | Lowas of Aug 8 | Grass | High |
| Saint Charles | Lowas of Aug 8 | Grass | High |
| Oak Brook | Lowas of Aug 8 | Grass | High |
| Staunton | Lowas of Aug 8 | Grass | High |
| Long Lake | Lowas of Aug 8 | Grass | High |
| South Chicago | Lowas of Aug 8 | Grass | High |
| Columbia | Lowas of Aug 8 | Grass | High |
| Pittsfield | Lowas of Aug 8 | Grass | High |
| Lincolnshire | Lowas of Aug 8 | Grass | High |
| Rockford | Noneas of Aug 8 | None | High |
| Springfield | Noneas of Aug 8 | None | High |
| Naperville | Noneas of Aug 8 | None | High |
| Champaign | Noneas of Aug 8 | None | High |
| Bloomington | Noneas of Aug 8 | None | High |
| Decatur | Noneas of Aug 8 | None | High |
| Kankakee | Noneas of Aug 8 | None | High |
| Normal | Noneas of Aug 8 | None | High |
| Plainfield | Noneas of Aug 8 | None | High |
| Moline | Noneas of Aug 8 | None | High |
| Dekalb | Noneas of Aug 8 | None | High |
| Quincy | Noneas of Aug 8 | None | High |
| Urbana | Noneas of Aug 8 | None | High |
| Rock Island | Noneas of Aug 8 | None | High |
| Oswego | Noneas of Aug 8 | None | High |
| Galesburg | Noneas of Aug 8 | None | High |
| Danville | Noneas of Aug 8 | None | High |
| Woodstock | Noneas of Aug 8 | None | High |
| Belvidere | Noneas of Aug 8 | None | High |
| Freeport | Noneas of Aug 8 | None | High |
| Loves Park | Noneas of Aug 8 | None | High |
| Machesney Park | Noneas of Aug 8 | None | High |
| East Peoria | Noneas of Aug 8 | None | High |
| Carbondale | Noneas of Aug 8 | None | High |
| East Moline | Noneas of Aug 8 | None | High |
| Ottawa | Noneas of Aug 8 | None | High |
| Bourbonnais | Noneas of Aug 8 | None | High |
| Charleston | Noneas of Aug 8 | None | High |
| Marion | Noneas of Aug 8 | None | High |
| Morton | Noneas of Aug 8 | None | High |
| Mattoon | Noneas of Aug 8 | None | High |
| Washington | Noneas of Aug 8 | None | High |
| Bradley | Noneas of Aug 8 | None | High |
| Dixon | Noneas of Aug 8 | None | High |
| Morris | Noneas of Aug 8 | None | High |
| Chatham | Noneas of Aug 8 | None | High |
| Lincoln | Noneas of Aug 8 | None | High |
| Rantoul | Noneas of Aug 8 | None | High |
| Kewanee | Noneas of Aug 8 | None | High |
| Streator | Noneas of Aug 8 | None | High |
| Herrin | Noneas of Aug 8 | None | High |
| Effingham | Noneas of Aug 8 | None | High |
| Centralia | Noneas of Aug 8 | None | High |
| Pontiac | Noneas of Aug 8 | None | High |
| Taylorville | Noneas of Aug 8 | None | High |
| Ramsey | Noneas of Aug 8 | None | High |
| Niantic | Noneas of Aug 8 | None | High |
| Dalzell | Noneas of Aug 8 | None | High |
| Benton | Noneas of Aug 8 | None | High |
| Harrisburg | Noneas of Aug 8 | None | High |
| Fairfield | Noneas of Aug 8 | None | High |
| Cherry Valley | Noneas of Aug 8 | None | High |
| Marengo | Noneas of Aug 8 | None | High |
| Savoy | Noneas of Aug 8 | None | High |
| New Boston | Noneas of Aug 8 | None | High |
| Monmouth | Noneas of Aug 8 | None | High |
| Orangeville | Noneas of Aug 8 | None | High |
| Waterloo | Noneas of Aug 8 | None | High |
| Coal Valley | Noneas of Aug 8 | None | High |
| Sugar Grove | Noneas of Aug 8 | None | High |
| Villa Grove | Noneas of Aug 8 | None | High |
| Johnston City | Noneas of Aug 8 | None | High |
| Hampshire | Noneas of Aug 8 | None | High |
| West Peoria | Noneas of Aug 8 | None | High |
| Mcleansboro | Noneas of Aug 8 | None | High |
| Martinton | Noneas of Aug 8 | None | High |
| Dakota | Noneas of Aug 8 | None | High |
| Pecatonica | Noneas of Aug 8 | None | High |
| Cobden | Noneas of Aug 8 | None | High |
| Rockton | Noneas of Aug 8 | None | High |
| Galena | Noneas of Aug 8 | None | High |
| Geneseo | Noneas of Aug 8 | None | High |
| Clinton | Noneas of Aug 8 | None | High |
| Harvard | Noneas of Aug 8 | None | High |
| Princeton | Noneas of Aug 8 | None | High |
| Mahomet | Noneas of Aug 8 | None | High |
| Tampico | Noneas of Aug 8 | None | High |
| Golden | Noneas of Aug 8 | None | High |
| Mineral | Noneas of Aug 8 | None | High |
| Brookport | Noneas of Aug 8 | None | High |
| Dawson | Noneas of Aug 8 | None | High |
| Rochester | Noneas of Aug 8 | None | High |
| Kincaid | Noneas of Aug 8 | None | High |
| Elburn | Noneas of Aug 8 | None | High |
| Sublette | Noneas of Aug 8 | None | High |
| Downs | Noneas of Aug 8 | None | High |
| Red Bud | Noneas of Aug 8 | None | High |
| Poplar Grove | Noneas of Aug 8 | None | High |
| Forsyth | Noneas of Aug 8 | None | High |
| West Union | Noneas of Aug 8 | None | High |
| Farmingdale | Noneas of Aug 8 | None | High |
| Kempton | Noneas of Aug 8 | None | High |
| Hoopeston | Noneas of Aug 8 | None | High |
| Paris | Noneas of Aug 8 | None | High |
| Stillman Valley | Noneas of Aug 8 | None | High |
| Sherman | Noneas of Aug 8 | None | High |
| Marshall | Noneas of Aug 8 | None | High |
| Burlington | Noneas of Aug 8 | None | High |
| Monticello | Noneas of Aug 8 | None | High |
| Mount Carmel | Noneas of Aug 8 | None | High |
| Warsaw | Noneas of Aug 8 | None | High |
| Ursa | Noneas of Aug 8 | None | High |
| Tennessee | Noneas of Aug 8 | None | High |
| German Valley | Noneas of Aug 8 | None | High |
| Makanda | Noneas of Aug 8 | None | High |
| Arenzville | Noneas of Aug 8 | None | High |
| Peoria | No live reading | Not available | High |
| Round Lake Beach | No live reading | Not available | High |
| Aurora | No live reading | Not available | High |
| Orland Park | No live reading | Not available | High |
| Berwyn | No live reading | Not available | High |
| Wheaton | No live reading | Not available | High |
| Glenview | No live reading | Not available | High |
| Addison | No live reading | Not available | High |
| Elk Grove Village | No live reading | Not available | High |
| Pekin | No live reading | Not available | High |
| Lake In The Hills | No live reading | Not available | High |
| Burbank | No live reading | Not available | High |
| Lansing | No live reading | Not available | High |
| Chicago Heights | No live reading | Not available | High |
| Lockport | No live reading | Not available | High |
| Morton Grove | No live reading | Not available | High |
| Melrose Park | No live reading | Not available | High |
| Collinsville | No live reading | Not available | High |
| South Elgin | No live reading | Not available | High |
| Lisle | No live reading | Not available | High |
| Bloomingdale | No live reading | Not available | High |
| Yorkville | No live reading | Not available | High |
| South Holland | No live reading | Not available | High |
| Grayslake | No live reading | Not available | High |
| Libertyville | No live reading | Not available | High |
| Crest Hill | No live reading | Not available | High |
| Brookfield | No live reading | Not available | High |
| North Aurora | No live reading | Not available | High |
| East St. Louis | No live reading | Not available | High |
| Sycamore | No live reading | Not available | High |
| Franklin Park | No live reading | Not available | High |
| Shorewood | No live reading | Not available | High |
| Hinsdale | No live reading | Not available | High |
| La Grange | No live reading | Not available | High |
| Macomb | No live reading | Not available | High |
| Hickory Hills | No live reading | Not available | High |
| Sterling | No live reading | Not available | High |
| Swansea | No live reading | Not available | High |
| Mount Vernon | No live reading | Not available | High |
| Lindenhurst | No live reading | Not available | High |
| Wood Dale | No live reading | Not available | High |
| Canton | No live reading | Not available | High |
| Lincolnwood | No live reading | Not available | High |
| Minooka | No live reading | Not available | High |
| Winnetka | No live reading | Not available | High |
| Justice | No live reading | Not available | High |
| Palos Heights | No live reading | Not available | High |
| Plano | No live reading | Not available | High |
| Albers | No live reading | Not available | High |
| Astoria | No live reading | Not available | High |
| Fox River Grove | No live reading | Not available | High |
| Greenville | No live reading | Not available | High |
| Dundee | No live reading | Not available | High |
| Olney | No live reading | Not available | High |
| Aledo | No live reading | Not available | High |
| Auburn | No live reading | Not available | High |
| Roxbury | No live reading | Not available | High |
| Winfield | No live reading | Not available | High |
| La Salle | No live reading | Not available | High |
| Illinois City | No live reading | Not available | High |
| Manteno | No live reading | Not available | High |
| Carbon | No live reading | Not available | High |
| Kinsman | No live reading | Not available | High |
| Clifton | No live reading | Not available | High |
| Dunlap | No live reading | Not available | High |
| Fulton | No live reading | Not available | High |
| Oregon | No live reading | Not available | High |
| Custer | No live reading | Not available | High |
| Mettawa | No live reading | Not available | High |
| Mansfield | No live reading | Not available | High |
| Somonauk | No live reading | Not available | High |
| Milan | No live reading | Not available | High |
| Peotone | No live reading | Not available | High |
| Benson | No live reading | Not available | High |
| Manhattan | No live reading | Not available | High |
| Menard | No live reading | Not available | High |
| Nashville | No live reading | Not available | High |
| Morrison | No live reading | Not available | High |
| Sullivan | No live reading | Not available | High |
| Winnebago | No live reading | Not available | High |
| Highwood | No live reading | Not available | High |
| Wilmington | No live reading | Not available | High |
| Olympia Fields | No live reading | Not available | High |
| Fithian | No live reading | Not available | High |
| Ohio | No live reading | Not available | High |
| Saint Anne | No live reading | Not available | High |
| Lyons | No live reading | Not available | High |
| Gibson City | No live reading | Not available | High |
| White Hall | No live reading | Not available | High |
Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.
Pollen is only half of what's in the air. See today's air quality in Illinois for ozone, dust, and smoke readings by city.
The Illinois allergy season
Allergy levels in Illinois 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 Illinois?
Pollen levels in Illinois usually begin climbing in March and reach their highest point in September.
What is the worst month for allergies in Illinois?
September is typically the worst month in Illinois, driven by ragweed pollen.
When does ragweed season end in Illinois?
Ragweed pollen in Illinois usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Illinois?
January usually brings the lowest pollen levels of the year in Illinois.