Illinois pollen and allergy seasons
October outlookModerate
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 October
Ragweed
Typical peak in October
No clear peak this month
Worst month of the year
September
Best month of the year
January
What is active in October
Ragweed
Cities in Illinois
| City | Today | Worst today | Typical in October |
|---|---|---|---|
| Chicago | Lowas of Oct 16 | Ragweed | Moderate |
| Round Lake Beach | Lowas of Oct 16 | Ragweed | Moderate |
| Aurora | Lowas of Oct 16 | Ragweed | Moderate |
| Cicero | Lowas of Oct 16 | Ragweed | Moderate |
| Alton | Lowas of Oct 16 | Ragweed | Moderate |
| Evanston | Lowas of Oct 16 | Ragweed | Moderate |
| Palatine | Lowas of Oct 16 | Ragweed | Moderate |
| Skokie | Lowas of Oct 16 | Ragweed | Moderate |
| Oak Lawn | Lowas of Oct 16 | Ragweed | Moderate |
| Mount Prospect | Lowas of Oct 16 | Ragweed | Moderate |
| Oak Park | Lowas of Oct 16 | Ragweed | Moderate |
| Hoffman Estates | Lowas of Oct 16 | Ragweed | Moderate |
| Lombard | Lowas of Oct 16 | Ragweed | Moderate |
| Buffalo Grove | Lowas of Oct 16 | Ragweed | Moderate |
| Belleville | Lowas of Oct 16 | Ragweed | Moderate |
| Bartlett | Lowas of Oct 16 | Ragweed | Moderate |
| Crystal Lake | Lowas of Oct 16 | Ragweed | Moderate |
| Park Ridge | Lowas of Oct 16 | Ragweed | Moderate |
| Carpentersville | Lowas of Oct 16 | Ragweed | Moderate |
| Addison | Lowas of Oct 16 | Ragweed | Moderate |
| Glendale Heights | Lowas of Oct 16 | Ragweed | Moderate |
| Niles | Lowas of Oct 16 | Ragweed | Moderate |
| Highland Park | Lowas of Oct 16 | Ragweed | Moderate |
| Algonquin | Lowas of Oct 16 | Ragweed | Moderate |
| Lake In The Hills | Lowas of Oct 16 | Ragweed | Moderate |
| Lansing | Lowas of Oct 16 | Ragweed | Moderate |
| Glen Ellyn | Lowas of Oct 16 | Ragweed | Moderate |
| Mchenry | Lowas of Oct 16 | Ragweed | Moderate |
| Wilmette | Lowas of Oct 16 | Ragweed | Moderate |
| New Lenox | Lowas of Oct 16 | Ragweed | Moderate |
| Oak Forest | Lowas of Oct 16 | Ragweed | Moderate |
| Vernon Hills | Lowas of Oct 16 | Ragweed | Moderate |
| Batavia | Lowas of Oct 16 | Ragweed | Moderate |
| Lockport | Lowas of Oct 16 | Ragweed | Moderate |
| West Chicago | Lowas of Oct 16 | Ragweed | Moderate |
| Homer Glen | Lowas of Oct 16 | Ragweed | Moderate |
| Collinsville | Lowas of Oct 16 | Ragweed | Moderate |
| Rolling Meadows | Lowas of Oct 16 | Ragweed | Moderate |
| Lisle | Lowas of Oct 16 | Ragweed | Moderate |
| Villa Park | Lowas of Oct 16 | Ragweed | Moderate |
| Dolton | Lowas of Oct 16 | Ragweed | Moderate |
| Libertyville | Lowas of Oct 16 | Ragweed | Moderate |
| Crest Hill | Lowas of Oct 16 | Ragweed | Moderate |
| Lake Zurich | Lowas of Oct 16 | Ragweed | Moderate |
| Evergreen Park | Lowas of Oct 16 | Ragweed | Moderate |
| Matteson | Lowas of Oct 16 | Ragweed | Moderate |
| East St. Louis | Lowas of Oct 16 | Ragweed | Moderate |
| Shorewood | Lowas of Oct 16 | Ragweed | Moderate |
| Cary | Lowas of Oct 16 | Ragweed | Moderate |
| Jacksonville | Lowas of Oct 16 | Ragweed | Moderate |
| Cahokia Heights | Lowas of Oct 16 | Ragweed | Moderate |
| Hinsdale | Lowas of Oct 16 | Ragweed | Moderate |
| Bridgeview | Lowas of Oct 16 | Ragweed | Moderate |
| Fairview Heights | Lowas of Oct 16 | Ragweed | Moderate |
| La Grange | Lowas of Oct 16 | Ragweed | Moderate |
| Antioch | Lowas of Oct 16 | Ragweed | Moderate |
| Lindenhurst | Lowas of Oct 16 | Ragweed | Moderate |
| Shiloh | Lowas of Oct 16 | Ragweed | Moderate |
| Midlothian | Lowas of Oct 16 | Ragweed | Moderate |
| Wauconda | Lowas of Oct 16 | Ragweed | Moderate |
| Forest Park | Lowas of Oct 16 | Ragweed | Moderate |
| Wood Dale | Lowas of Oct 16 | Ragweed | Moderate |
| Channahon | Lowas of Oct 16 | Ragweed | Moderate |
| Hazel Crest | Lowas of Oct 16 | Ragweed | Moderate |
| Winnetka | Lowas of Oct 16 | Ragweed | Moderate |
| Palos Heights | Lowas of Oct 16 | Ragweed | Moderate |
| Schiller Park | Lowas of Oct 16 | Ragweed | Moderate |
| Markham | Lowas of Oct 16 | Ragweed | Moderate |
| Millstadt | Lowas of Oct 16 | Ragweed | Moderate |
| Spring Grove | Lowas of Oct 16 | Ragweed | Moderate |
| Long Grove | Lowas of Oct 16 | Ragweed | Moderate |
| Cottage Hills | Lowas of Oct 16 | Ragweed | Moderate |
| Fox River Grove | Lowas of Oct 16 | Ragweed | Moderate |
| Winfield | Lowas of Oct 16 | Ragweed | Moderate |
| Dundee | Lowas of Oct 16 | Ragweed | Moderate |
| Elwood | Lowas of Oct 16 | Ragweed | Moderate |
| Steger | Lowas of Oct 16 | Ragweed | Moderate |
| Peotone | Lowas of Oct 16 | Ragweed | Moderate |
| Hometown | Lowas of Oct 16 | Ragweed | Moderate |
| Manhattan | Lowas of Oct 16 | Ragweed | Moderate |
| South Chicago | Lowas of Oct 16 | Ragweed | Moderate |
| Long Lake | Lowas of Oct 16 | Ragweed | Moderate |
| Wilmington | Lowas of Oct 16 | Ragweed | Moderate |
| Rosemont | Lowas of Oct 16 | Ragweed | Moderate |
| Moro | Lowas of Oct 16 | Ragweed | Moderate |
| Springfield | Noneas of Oct 16 | None | Moderate |
| Champaign | Noneas of Oct 16 | None | Moderate |
| Moline | Noneas of Oct 16 | None | Moderate |
| Dekalb | Noneas of Oct 16 | None | Moderate |
| Quincy | Noneas of Oct 16 | None | Moderate |
| Pekin | Noneas of Oct 16 | None | Moderate |
| Galesburg | Noneas of Oct 16 | None | Moderate |
| Danville | Noneas of Oct 16 | None | Moderate |
| Freeport | Noneas of Oct 16 | None | Moderate |
| Loves Park | Noneas of Oct 16 | None | Moderate |
| Machesney Park | Noneas of Oct 16 | None | Moderate |
| East Moline | Noneas of Oct 16 | None | Moderate |
| Bourbonnais | Noneas of Oct 16 | None | Moderate |
| Charleston | Noneas of Oct 16 | None | Moderate |
| Marion | Noneas of Oct 16 | None | Moderate |
| Morris | Noneas of Oct 16 | None | Moderate |
| Canton | Noneas of Oct 16 | None | Moderate |
| Lincoln | Noneas of Oct 16 | None | Moderate |
| Effingham | Noneas of Oct 16 | None | Moderate |
| Plano | Noneas of Oct 16 | None | Moderate |
| Pontiac | Noneas of Oct 16 | None | Moderate |
| Astoria | Noneas of Oct 16 | None | Moderate |
| Olney | Noneas of Oct 16 | None | Moderate |
| Marengo | Noneas of Oct 16 | None | Moderate |
| Aledo | Noneas of Oct 16 | None | Moderate |
| Auburn | Noneas of Oct 16 | None | Moderate |
| La Salle | Noneas of Oct 16 | None | Moderate |
| New Boston | Noneas of Oct 16 | None | Moderate |
| Monmouth | Noneas of Oct 16 | None | Moderate |
| Clifton | Noneas of Oct 16 | None | Moderate |
| Coal Valley | Noneas of Oct 16 | None | Moderate |
| West Peoria | Noneas of Oct 16 | None | Moderate |
| Mcleansboro | Noneas of Oct 16 | None | Moderate |
| Dakota | Noneas of Oct 16 | None | Moderate |
| Pecatonica | Noneas of Oct 16 | None | Moderate |
| Cobden | Noneas of Oct 16 | None | Moderate |
| Rockton | Noneas of Oct 16 | None | Moderate |
| Harvard | Noneas of Oct 16 | None | Moderate |
| Tampico | Noneas of Oct 16 | None | Moderate |
| Sullivan | Noneas of Oct 16 | None | Moderate |
| Mineral | Noneas of Oct 16 | None | Moderate |
| Elburn | Noneas of Oct 16 | None | Moderate |
| Brookport | Noneas of Oct 16 | None | Moderate |
| Rochester | Noneas of Oct 16 | None | Moderate |
| Kincaid | Noneas of Oct 16 | None | Moderate |
| Red Bud | Noneas of Oct 16 | None | Moderate |
| Poplar Grove | Noneas of Oct 16 | None | Moderate |
| West Union | Noneas of Oct 16 | None | Moderate |
| Farmingdale | Noneas of Oct 16 | None | Moderate |
| Hoopeston | Noneas of Oct 16 | None | Moderate |
| Paris | Noneas of Oct 16 | None | Moderate |
| Marshall | Noneas of Oct 16 | None | Moderate |
| Saint Anne | Noneas of Oct 16 | None | Moderate |
| Monticello | Noneas of Oct 16 | None | Moderate |
| Ursa | Noneas of Oct 16 | None | Moderate |
| Rockford | No live reading | Not available | Moderate |
| Peoria | No live reading | Not available | Moderate |
| Joliet | No live reading | Not available | Moderate |
| Naperville | No live reading | Not available | Moderate |
| Bloomington | No live reading | Not available | Moderate |
| Elgin | No live reading | Not available | Moderate |
| Waukegan | No live reading | Not available | Moderate |
| Decatur | No live reading | Not available | Moderate |
| Schaumburg | No live reading | Not available | Moderate |
| Arlington Heights | No live reading | Not available | Moderate |
| Bolingbrook | No live reading | Not available | Moderate |
| Kankakee | No live reading | Not available | Moderate |
| Des Plaines | No live reading | Not available | Moderate |
| Orland Park | No live reading | Not available | Moderate |
| Berwyn | No live reading | Not available | Moderate |
| Tinley Park | No live reading | Not available | Moderate |
| Wheaton | No live reading | Not available | Moderate |
| Normal | No live reading | Not available | Moderate |
| Downers Grove | No live reading | Not available | Moderate |
| Glenview | No live reading | Not available | Moderate |
| Plainfield | No live reading | Not available | Moderate |
| Elmhurst | No live reading | Not available | Moderate |
| Romeoville | No live reading | Not available | Moderate |
| Carol Stream | No live reading | Not available | Moderate |
| Streamwood | No live reading | Not available | Moderate |
| Wheeling | No live reading | Not available | Moderate |
| Urbana | No live reading | Not available | Moderate |
| Hanover Park | No live reading | Not available | Moderate |
| Rock Island | No live reading | Not available | Moderate |
| Oswego | No live reading | Not available | Moderate |
| Calumet City | No live reading | Not available | Moderate |
| Northbrook | No live reading | Not available | Moderate |
| Woodridge | No live reading | Not available | Moderate |
| St. Charles | No live reading | Not available | Moderate |
| O'fallon | No live reading | Not available | Moderate |
| Elk Grove Village | No live reading | Not available | Moderate |
| Mundelein | No live reading | Not available | Moderate |
| North Chicago | No live reading | Not available | Moderate |
| Gurnee | No live reading | Not available | Moderate |
| Burbank | No live reading | Not available | Moderate |
| Huntley | No live reading | Not available | Moderate |
| Chicago Heights | No live reading | Not available | Moderate |
| Granite City | No live reading | Not available | Moderate |
| Edwardsville | No live reading | Not available | Moderate |
| Woodstock | No live reading | Not available | Moderate |
| Morton Grove | No live reading | Not available | Moderate |
| Melrose Park | No live reading | Not available | Moderate |
| Belvidere | No live reading | Not available | Moderate |
| Zion | No live reading | Not available | Moderate |
| Westmont | No live reading | Not available | Moderate |
| South Elgin | No live reading | Not available | Moderate |
| Elmwood Park | No live reading | Not available | Moderate |
| Blue Island | No live reading | Not available | Moderate |
| Maywood | No live reading | Not available | Moderate |
| Roselle | No live reading | Not available | Moderate |
| East Peoria | No live reading | Not available | Moderate |
| Bloomingdale | No live reading | Not available | Moderate |
| Yorkville | No live reading | Not available | Moderate |
| Darien | No live reading | Not available | Moderate |
| Carbondale | No live reading | Not available | Moderate |
| Geneva | No live reading | Not available | Moderate |
| Montgomery | No live reading | Not available | Moderate |
| South Holland | No live reading | Not available | Moderate |
| Park Forest | No live reading | Not available | Moderate |
| Grayslake | No live reading | Not available | Moderate |
| Frankfort | No live reading | Not available | Moderate |
| Mokena | No live reading | Not available | Moderate |
| Harvey | No live reading | Not available | Moderate |
| Homewood | No live reading | Not available | Moderate |
| Brookfield | No live reading | Not available | Moderate |
| Lake Forest | No live reading | Not available | Moderate |
| Deerfield | No live reading | Not available | Moderate |
| Ottawa | No live reading | Not available | Moderate |
| Alsip | No live reading | Not available | Moderate |
| Round Lake | No live reading | Not available | Moderate |
| Bensenville | No live reading | Not available | Moderate |
| North Aurora | No live reading | Not available | Moderate |
| Bellwood | No live reading | Not available | Moderate |
| Sycamore | No live reading | Not available | Moderate |
| Franklin Park | No live reading | Not available | Moderate |
| Palos Hills | No live reading | Not available | Moderate |
| Godfrey | No live reading | Not available | Moderate |
| Lemont | No live reading | Not available | Moderate |
| Westchester | No live reading | Not available | Moderate |
| Morton | No live reading | Not available | Moderate |
| Country Club Hills | No live reading | Not available | Moderate |
| Mattoon | No live reading | Not available | Moderate |
| Washington | No live reading | Not available | Moderate |
| Prospect Heights | No live reading | Not available | Moderate |
| Bradley | No live reading | Not available | Moderate |
| Norridge | No live reading | Not available | Moderate |
| Dixon | No live reading | Not available | Moderate |
| Macomb | No live reading | Not available | Moderate |
| Chatham | No live reading | Not available | Moderate |
| Hickory Hills | No live reading | Not available | Moderate |
| Sterling | No live reading | Not available | Moderate |
| Swansea | No live reading | Not available | Moderate |
| Mount Vernon | No live reading | Not available | Moderate |
| Warrenville | No live reading | Not available | Moderate |
| Chicago Ridge | No live reading | Not available | Moderate |
| Beach Park | No live reading | Not available | Moderate |
| Glen Carbon | No live reading | Not available | Moderate |
| Western Springs | No live reading | Not available | Moderate |
| La Grange Park | No live reading | Not available | Moderate |
| Lincolnwood | No live reading | Not available | Moderate |
| Minooka | No live reading | Not available | Moderate |
| Richton Park | No live reading | Not available | Moderate |
| Northlake | No live reading | Not available | Moderate |
| Rantoul | No live reading | Not available | Moderate |
| Justice | No live reading | Not available | Moderate |
| Kewanee | No live reading | Not available | Moderate |
| Streator | No live reading | Not available | Moderate |
| Herrin | No live reading | Not available | Moderate |
| Centralia | No live reading | Not available | Moderate |
| River Forest | No live reading | Not available | Moderate |
| Taylorville | No live reading | Not available | Moderate |
| Burr Ridge | No live reading | Not available | Moderate |
| Clarendon Hills | No live reading | Not available | Moderate |
| Cahokia | No live reading | Not available | Moderate |
| Ramsey | No live reading | Not available | Moderate |
| Niantic | No live reading | Not available | Moderate |
| Albers | No live reading | Not available | Moderate |
| East Saint Louis | No live reading | Not available | Moderate |
| Riverside | No live reading | Not available | Moderate |
| Maryville | No live reading | Not available | Moderate |
| Dalzell | No live reading | Not available | Moderate |
| Benton | No live reading | Not available | Moderate |
| Harrisburg | No live reading | Not available | Moderate |
| Greenville | No live reading | Not available | Moderate |
| Lake Villa | No live reading | Not available | Moderate |
| Peru | No live reading | Not available | Moderate |
| Itasca | No live reading | Not available | Moderate |
| Roxbury | No live reading | Not available | Moderate |
| Fairfield | No live reading | Not available | Moderate |
| Cherry Valley | No live reading | Not available | Moderate |
| Carbon | No live reading | Not available | Moderate |
| Savoy | No live reading | Not available | Moderate |
| Illinois City | No live reading | Not available | Moderate |
| Manteno | No live reading | Not available | Moderate |
| Barrington | No live reading | Not available | Moderate |
| Jerseyville | No live reading | Not available | Moderate |
| Crete | No live reading | Not available | Moderate |
| Kinsman | No live reading | Not available | Moderate |
| Dunlap | No live reading | Not available | Moderate |
| Villa Grove | No live reading | Not available | Moderate |
| Girard | No live reading | Not available | Moderate |
| Waterloo | No live reading | Not available | Moderate |
| Orangeville | No live reading | Not available | Moderate |
| Carlinville | No live reading | Not available | Moderate |
| Fulton | No live reading | Not available | Moderate |
| Sugar Grove | No live reading | Not available | Moderate |
| Island Lake | No live reading | Not available | Moderate |
| Willowbrook | No live reading | Not available | Moderate |
| Oregon | No live reading | Not available | Moderate |
| Johnston City | No live reading | Not available | Moderate |
| Palos Park | No live reading | Not available | Moderate |
| Custer | No live reading | Not available | Moderate |
| Hampshire | No live reading | Not available | Moderate |
| Mendota | No live reading | Not available | Moderate |
| Martinton | No live reading | Not available | Moderate |
| Mettawa | No live reading | Not available | Moderate |
| Somonauk | No live reading | Not available | Moderate |
| Mansfield | No live reading | Not available | Moderate |
| Galena | No live reading | Not available | Moderate |
| Geneseo | No live reading | Not available | Moderate |
| Milan | No live reading | Not available | Moderate |
| Clinton | No live reading | Not available | Moderate |
| Benson | No live reading | Not available | Moderate |
| Saint Charles | No live reading | Not available | Moderate |
| Lake Bluff | No live reading | Not available | Moderate |
| Dupo | No live reading | Not available | Moderate |
| Menard | No live reading | Not available | Moderate |
| Nashville | No live reading | Not available | Moderate |
| Princeton | No live reading | Not available | Moderate |
| Mahomet | No live reading | Not available | Moderate |
| Morrison | No live reading | Not available | Moderate |
| Golden | No live reading | Not available | Moderate |
| Oak Brook | No live reading | Not available | Moderate |
| Winnebago | No live reading | Not available | Moderate |
| Highwood | No live reading | Not available | Moderate |
| Bunker Hill | No live reading | Not available | Moderate |
| Staunton | No live reading | Not available | Moderate |
| Freeburg | No live reading | Not available | Moderate |
| Dawson | No live reading | Not available | Moderate |
| Sublette | No live reading | Not available | Moderate |
| Baylis | No live reading | Not available | Moderate |
| Downs | No live reading | Not available | Moderate |
| Olympia Fields | No live reading | Not available | Moderate |
| Forsyth | No live reading | Not available | Moderate |
| Fithian | No live reading | Not available | Moderate |
| Kempton | No live reading | Not available | Moderate |
| Columbia | No live reading | Not available | Moderate |
| Ohio | No live reading | Not available | Moderate |
| Stillman Valley | No live reading | Not available | Moderate |
| Sherman | No live reading | Not available | Moderate |
| Pittsfield | No live reading | Not available | Moderate |
| Troy | No live reading | Not available | Moderate |
| Mount Carmel | No live reading | Not available | Moderate |
| Warsaw | No live reading | Not available | Moderate |
| Lyons | No live reading | Not available | Moderate |
| Lincolnshire | No live reading | Not available | Moderate |
| Gibson City | No live reading | Not available | Moderate |
| Tennessee | No live reading | Not available | Moderate |
| German Valley | No live reading | Not available | Moderate |
| Burlington | No live reading | Not available | Moderate |
| White Hall | No live reading | Not available | Moderate |
| Makanda | No live reading | Not available | Moderate |
| Arenzville | 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.
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.