Illinois pollen and allergy seasons
July outlookModerate
Illinois has a spring tree season and one of the heavier ragweed seasons in the country in late summer.
Twelve month pollen calendar
J
F
M
A
M
J
J
●
A
S
O
N
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 Illinois
| City | Today | Worst today | Typical in July |
|---|---|---|---|
| Chicago | Very Highas of Jul 15 | Grass | Moderate |
| Schaumburg | Very Highas of Jul 15 | Grass | Moderate |
| Evanston | Very Highas of Jul 15 | Grass | Moderate |
| Palatine | Very Highas of Jul 15 | Grass | Moderate |
| Des Plaines | Very Highas of Jul 15 | Grass | Moderate |
| Orland Park | Very Highas of Jul 15 | Grass | Moderate |
| Berwyn | Very Highas of Jul 15 | Grass | Moderate |
| Downers Grove | Very Highas of Jul 15 | Grass | Moderate |
| Buffalo Grove | Very Highas of Jul 15 | Grass | Moderate |
| Romeoville | Very Highas of Jul 15 | Grass | Moderate |
| Bartlett | Very Highas of Jul 15 | Grass | Moderate |
| Crystal Lake | Very Highas of Jul 15 | Grass | Moderate |
| Park Ridge | Very Highas of Jul 15 | Grass | Moderate |
| Wheeling | Very Highas of Jul 15 | Grass | Moderate |
| Woodridge | Very Highas of Jul 15 | Grass | Moderate |
| St. Charles | Very Highas of Jul 15 | Grass | Moderate |
| O'fallon | Very Highas of Jul 15 | Grass | Moderate |
| Burbank | Very Highas of Jul 15 | Grass | Moderate |
| Lansing | Very Highas of Jul 15 | Grass | Moderate |
| Oak Forest | Very Highas of Jul 15 | Grass | Moderate |
| Batavia | Very Highas of Jul 15 | Grass | Moderate |
| Lockport | Very Highas of Jul 15 | Grass | Moderate |
| West Chicago | Very Highas of Jul 15 | Grass | Moderate |
| Homer Glen | Very Highas of Jul 15 | Grass | Moderate |
| Melrose Park | Very Highas of Jul 15 | Grass | Moderate |
| Zion | Very Highas of Jul 15 | Grass | Moderate |
| Collinsville | Very Highas of Jul 15 | Grass | Moderate |
| Lisle | Very Highas of Jul 15 | Grass | Moderate |
| South Holland | Very Highas of Jul 15 | Grass | Moderate |
| Dolton | Very Highas of Jul 15 | Grass | Moderate |
| Mokena | Very Highas of Jul 15 | Grass | Moderate |
| Homewood | Very Highas of Jul 15 | Grass | Moderate |
| Brookfield | Very Highas of Jul 15 | Grass | Moderate |
| Deerfield | Very Highas of Jul 15 | Grass | Moderate |
| Matteson | Very Highas of Jul 15 | Grass | Moderate |
| Bensenville | Very Highas of Jul 15 | Grass | Moderate |
| North Aurora | Very Highas of Jul 15 | Grass | Moderate |
| East St. Louis | Very Highas of Jul 15 | Grass | Moderate |
| Franklin Park | Very Highas of Jul 15 | Grass | Moderate |
| Cary | Very Highas of Jul 15 | Grass | Moderate |
| Godfrey | Very Highas of Jul 15 | Grass | Moderate |
| La Grange | Very Highas of Jul 15 | Grass | Moderate |
| Norridge | Very Highas of Jul 15 | Grass | Moderate |
| Antioch | Very Highas of Jul 15 | Grass | Moderate |
| Hickory Hills | Very Highas of Jul 15 | Grass | Moderate |
| Lindenhurst | Very Highas of Jul 15 | Grass | Moderate |
| Beach Park | Very Highas of Jul 15 | Grass | Moderate |
| Winnetka | Very Highas of Jul 15 | Grass | Moderate |
| East Saint Louis | Very Highas of Jul 15 | Grass | Moderate |
| Cottage Hills | Very Highas of Jul 15 | Grass | Moderate |
| Lake Villa | Very Highas of Jul 15 | Grass | Moderate |
| Dundee | Very Highas of Jul 15 | Grass | Moderate |
| Winfield | Very Highas of Jul 15 | Grass | Moderate |
| Elwood | Very Highas of Jul 15 | Grass | Moderate |
| Steger | Very Highas of Jul 15 | Grass | Moderate |
| Wilmington | Very Highas of Jul 15 | Grass | Moderate |
| Columbia | Very Highas of Jul 15 | Grass | Moderate |
| Waukegan | Highas of Jul 15 | Grass | Moderate |
| Alton | Highas of Jul 15 | Grass | Moderate |
| Arlington Heights | Highas of Jul 15 | Grass | Moderate |
| Mount Prospect | Highas of Jul 15 | Grass | Moderate |
| Oak Park | Highas of Jul 15 | Grass | Moderate |
| Elk Grove Village | Highas of Jul 15 | Grass | Moderate |
| Glen Ellyn | Highas of Jul 15 | Grass | Moderate |
| New Lenox | Highas of Jul 15 | Grass | Moderate |
| Chicago Heights | Highas of Jul 15 | Grass | Moderate |
| Morton Grove | Highas of Jul 15 | Grass | Moderate |
| Rolling Meadows | Highas of Jul 15 | Grass | Moderate |
| Roselle | Highas of Jul 15 | Grass | Moderate |
| Villa Park | Highas of Jul 15 | Grass | Moderate |
| Grayslake | Highas of Jul 15 | Grass | Moderate |
| Harvey | Highas of Jul 15 | Grass | Moderate |
| Round Lake | Highas of Jul 15 | Grass | Moderate |
| Prospect Heights | Highas of Jul 15 | Grass | Moderate |
| Swansea | Highas of Jul 15 | Grass | Moderate |
| Forest Park | Highas of Jul 15 | Grass | Moderate |
| Palos Heights | Highas of Jul 15 | Grass | Moderate |
| Millstadt | Highas of Jul 15 | Grass | Moderate |
| Lake Bluff | Highas of Jul 15 | Grass | Moderate |
| Dupo | Highas of Jul 15 | Grass | Moderate |
| Freeburg | Highas of Jul 15 | Grass | Moderate |
| Lyons | Highas of Jul 15 | Grass | Moderate |
| Moro | Highas of Jul 15 | Grass | Moderate |
| Aurora | Moderateas of Jul 15 | Grass | Moderate |
| Joliet | Moderateas of Jul 15 | Grass | Moderate |
| Elgin | Moderateas of Jul 15 | Grass | Moderate |
| Cicero | Moderateas of Jul 15 | Grass | Moderate |
| Oak Lawn | Moderateas of Jul 15 | Grass | Moderate |
| Tinley Park | Moderateas of Jul 15 | Grass | Moderate |
| Glenview | Moderateas of Jul 15 | Grass | Moderate |
| Elmhurst | Moderateas of Jul 15 | Grass | Moderate |
| Lombard | Moderateas of Jul 15 | Grass | Moderate |
| Carol Stream | Moderateas of Jul 15 | Grass | Moderate |
| Hanover Park | Moderateas of Jul 15 | Grass | Moderate |
| Calumet City | Moderateas of Jul 15 | Grass | Moderate |
| Northbrook | Moderateas of Jul 15 | Grass | Moderate |
| North Chicago | Moderateas of Jul 15 | Grass | Moderate |
| Niles | Moderateas of Jul 15 | Grass | Moderate |
| Highland Park | Moderateas of Jul 15 | Grass | Moderate |
| Lake In The Hills | Moderateas of Jul 15 | Grass | Moderate |
| Huntley | Moderateas of Jul 15 | Grass | Moderate |
| Mchenry | Moderateas of Jul 15 | Grass | Moderate |
| Westmont | Moderateas of Jul 15 | Grass | Moderate |
| South Elgin | Moderateas of Jul 15 | Grass | Moderate |
| Elmwood Park | Moderateas of Jul 15 | Grass | Moderate |
| Bloomingdale | Moderateas of Jul 15 | Grass | Moderate |
| Darien | Moderateas of Jul 15 | Grass | Moderate |
| Montgomery | Moderateas of Jul 15 | Grass | Moderate |
| Park Forest | Moderateas of Jul 15 | Grass | Moderate |
| Libertyville | Moderateas of Jul 15 | Grass | Moderate |
| Frankfort | Moderateas of Jul 15 | Grass | Moderate |
| Lake Zurich | Moderateas of Jul 15 | Grass | Moderate |
| Evergreen Park | Moderateas of Jul 15 | Grass | Moderate |
| Lake Forest | Moderateas of Jul 15 | Grass | Moderate |
| Alsip | Moderateas of Jul 15 | Grass | Moderate |
| Lemont | Moderateas of Jul 15 | Grass | Moderate |
| Bridgeview | Moderateas of Jul 15 | Grass | Moderate |
| Westchester | Moderateas of Jul 15 | Grass | Moderate |
| Country Club Hills | Moderateas of Jul 15 | Grass | Moderate |
| Fairview Heights | Moderateas of Jul 15 | Grass | Moderate |
| Chicago Ridge | Moderateas of Jul 15 | Grass | Moderate |
| Shiloh | Moderateas of Jul 15 | Grass | Moderate |
| Wauconda | Moderateas of Jul 15 | Grass | Moderate |
| Wood Dale | Moderateas of Jul 15 | Grass | Moderate |
| Channahon | Moderateas of Jul 15 | Grass | Moderate |
| Glen Carbon | Moderateas of Jul 15 | Grass | Moderate |
| La Grange Park | Moderateas of Jul 15 | Grass | Moderate |
| Northlake | Moderateas of Jul 15 | Grass | Moderate |
| Justice | Moderateas of Jul 15 | Grass | Moderate |
| River Forest | Moderateas of Jul 15 | Grass | Moderate |
| Markham | Moderateas of Jul 15 | Grass | Moderate |
| Carbon | Moderateas of Jul 15 | Grass | Moderate |
| Riverside | Moderateas of Jul 15 | Grass | Moderate |
| Fox River Grove | Moderateas of Jul 15 | Grass | Moderate |
| Barrington | Moderateas of Jul 15 | Grass | Moderate |
| Jerseyville | Moderateas of Jul 15 | Grass | Moderate |
| Crete | Moderateas of Jul 15 | Grass | Moderate |
| Peotone | Moderateas of Jul 15 | Grass | Moderate |
| Hometown | Moderateas of Jul 15 | Grass | Moderate |
| Manhattan | Moderateas of Jul 15 | Grass | Moderate |
| Saint Charles | Moderateas of Jul 15 | Grass | Moderate |
| Oak Brook | Moderateas of Jul 15 | Grass | Moderate |
| Bunker Hill | Moderateas of Jul 15 | Grass | Moderate |
| Staunton | Moderateas of Jul 15 | Grass | Moderate |
| Long Lake | Moderateas of Jul 15 | Grass | Moderate |
| Baylis | Moderateas of Jul 15 | Grass | Moderate |
| South Chicago | Moderateas of Jul 15 | Grass | Moderate |
| Rosemont | Moderateas of Jul 15 | Grass | Moderate |
| Maryville | Lowas of Jul 15 | Grass | Moderate |
| Troy | Lowas of Jul 15 | Grass | Moderate |
| Rockford | Noneas of Jul 15 | None | Moderate |
| Peoria | Noneas of Jul 15 | None | Moderate |
| Springfield | Noneas of Jul 15 | None | Moderate |
| Naperville | Noneas of Jul 15 | None | Moderate |
| Champaign | Noneas of Jul 15 | None | Moderate |
| Bloomington | Noneas of Jul 15 | None | Moderate |
| Decatur | Noneas of Jul 15 | None | Moderate |
| Kankakee | Noneas of Jul 15 | None | Moderate |
| Normal | Noneas of Jul 15 | None | Moderate |
| Plainfield | Noneas of Jul 15 | None | Moderate |
| Moline | Noneas of Jul 15 | None | Moderate |
| Dekalb | Noneas of Jul 15 | None | Moderate |
| Quincy | Noneas of Jul 15 | None | Moderate |
| Urbana | Noneas of Jul 15 | None | Moderate |
| Rock Island | Noneas of Jul 15 | None | Moderate |
| Oswego | Noneas of Jul 15 | None | Moderate |
| Pekin | Noneas of Jul 15 | None | Moderate |
| Danville | Noneas of Jul 15 | None | Moderate |
| Woodstock | Noneas of Jul 15 | None | Moderate |
| Belvidere | Noneas of Jul 15 | None | Moderate |
| Loves Park | Noneas of Jul 15 | None | Moderate |
| Machesney Park | Noneas of Jul 15 | None | Moderate |
| East Peoria | Noneas of Jul 15 | None | Moderate |
| Yorkville | Noneas of Jul 15 | None | Moderate |
| Carbondale | Noneas of Jul 15 | None | Moderate |
| Ottawa | Noneas of Jul 15 | None | Moderate |
| Marion | Noneas of Jul 15 | None | Moderate |
| Morton | Noneas of Jul 15 | None | Moderate |
| Mattoon | Noneas of Jul 15 | None | Moderate |
| Washington | Noneas of Jul 15 | None | Moderate |
| Bradley | Noneas of Jul 15 | None | Moderate |
| Macomb | Noneas of Jul 15 | None | Moderate |
| Morris | Noneas of Jul 15 | None | Moderate |
| Chatham | Noneas of Jul 15 | None | Moderate |
| Sterling | Noneas of Jul 15 | None | Moderate |
| Mount Vernon | Noneas of Jul 15 | None | Moderate |
| Lincoln | Noneas of Jul 15 | None | Moderate |
| Kewanee | Noneas of Jul 15 | None | Moderate |
| Herrin | Noneas of Jul 15 | None | Moderate |
| Effingham | Noneas of Jul 15 | None | Moderate |
| Centralia | Noneas of Jul 15 | None | Moderate |
| Plano | Noneas of Jul 15 | None | Moderate |
| Pontiac | Noneas of Jul 15 | None | Moderate |
| Taylorville | Noneas of Jul 15 | None | Moderate |
| Makanda | Noneas of Jul 15 | None | Moderate |
| Arenzville | Noneas of Jul 15 | None | Moderate |
| Ramsey | Noneas of Jul 15 | None | Moderate |
| Albers | Noneas of Jul 15 | None | Moderate |
| Dalzell | Noneas of Jul 15 | None | Moderate |
| Harrisburg | Noneas of Jul 15 | None | Moderate |
| Cherry Valley | Noneas of Jul 15 | None | Moderate |
| Marengo | Noneas of Jul 15 | None | Moderate |
| Aledo | Noneas of Jul 15 | None | Moderate |
| Greenville | Noneas of Jul 15 | None | Moderate |
| Auburn | Noneas of Jul 15 | None | Moderate |
| La Salle | Noneas of Jul 15 | None | Moderate |
| Illinois City | Noneas of Jul 15 | None | Moderate |
| New Boston | Noneas of Jul 15 | None | Moderate |
| Roxbury | Noneas of Jul 15 | None | Moderate |
| Monmouth | Noneas of Jul 15 | None | Moderate |
| Kinsman | Noneas of Jul 15 | None | Moderate |
| Dunlap | Noneas of Jul 15 | None | Moderate |
| Custer | Noneas of Jul 15 | None | Moderate |
| Waterloo | Noneas of Jul 15 | None | Moderate |
| Hampshire | Noneas of Jul 15 | None | Moderate |
| Fulton | Noneas of Jul 15 | None | Moderate |
| Oregon | Noneas of Jul 15 | None | Moderate |
| Mcleansboro | Noneas of Jul 15 | None | Moderate |
| Martinton | Noneas of Jul 15 | None | Moderate |
| Dakota | Noneas of Jul 15 | None | Moderate |
| Pecatonica | Noneas of Jul 15 | None | Moderate |
| Mansfield | Noneas of Jul 15 | None | Moderate |
| Cobden | Noneas of Jul 15 | None | Moderate |
| Rockton | Noneas of Jul 15 | None | Moderate |
| Galena | Noneas of Jul 15 | None | Moderate |
| Somonauk | Noneas of Jul 15 | None | Moderate |
| Milan | Noneas of Jul 15 | None | Moderate |
| Clinton | Noneas of Jul 15 | None | Moderate |
| Benson | Noneas of Jul 15 | None | Moderate |
| Harvard | Noneas of Jul 15 | None | Moderate |
| Menard | Noneas of Jul 15 | None | Moderate |
| Nashville | Noneas of Jul 15 | None | Moderate |
| Princeton | Noneas of Jul 15 | None | Moderate |
| Morrison | Noneas of Jul 15 | None | Moderate |
| Tampico | Noneas of Jul 15 | None | Moderate |
| Golden | Noneas of Jul 15 | None | Moderate |
| Winnebago | Noneas of Jul 15 | None | Moderate |
| Mineral | Noneas of Jul 15 | None | Moderate |
| Brookport | Noneas of Jul 15 | None | Moderate |
| Rochester | Noneas of Jul 15 | None | Moderate |
| Kincaid | Noneas of Jul 15 | None | Moderate |
| Sublette | Noneas of Jul 15 | None | Moderate |
| Poplar Grove | Noneas of Jul 15 | None | Moderate |
| Forsyth | Noneas of Jul 15 | None | Moderate |
| West Union | Noneas of Jul 15 | None | Moderate |
| Farmingdale | Noneas of Jul 15 | None | Moderate |
| Kempton | Noneas of Jul 15 | None | Moderate |
| Hoopeston | Noneas of Jul 15 | None | Moderate |
| Ohio | Noneas of Jul 15 | None | Moderate |
| Stillman Valley | Noneas of Jul 15 | None | Moderate |
| Sherman | Noneas of Jul 15 | None | Moderate |
| Marshall | Noneas of Jul 15 | None | Moderate |
| Saint Anne | Noneas of Jul 15 | None | Moderate |
| Monticello | Noneas of Jul 15 | None | Moderate |
| Mount Carmel | Noneas of Jul 15 | None | Moderate |
| Warsaw | Noneas of Jul 15 | None | Moderate |
| Ursa | Noneas of Jul 15 | None | Moderate |
| Gibson City | Noneas of Jul 15 | None | Moderate |
| German Valley | Noneas of Jul 15 | None | Moderate |
| Round Lake Beach | No live reading | Not available | Moderate |
| Bolingbrook | No live reading | Not available | Moderate |
| Skokie | No live reading | Not available | Moderate |
| Wheaton | No live reading | Not available | Moderate |
| Hoffman Estates | No live reading | Not available | Moderate |
| Belleville | No live reading | Not available | Moderate |
| Streamwood | No live reading | Not available | Moderate |
| Carpentersville | No live reading | Not available | Moderate |
| Addison | No live reading | Not available | Moderate |
| Glendale Heights | No live reading | Not available | Moderate |
| Mundelein | No live reading | Not available | Moderate |
| Gurnee | No live reading | Not available | Moderate |
| Algonquin | No live reading | Not available | Moderate |
| Galesburg | No live reading | Not available | Moderate |
| Wilmette | No live reading | Not available | Moderate |
| Vernon Hills | No live reading | Not available | Moderate |
| Granite City | No live reading | Not available | Moderate |
| Edwardsville | No live reading | Not available | Moderate |
| Freeport | No live reading | Not available | Moderate |
| Blue Island | No live reading | Not available | Moderate |
| Maywood | No live reading | Not available | Moderate |
| Geneva | No live reading | Not available | Moderate |
| East Moline | No live reading | Not available | Moderate |
| Crest Hill | No live reading | Not available | Moderate |
| Bellwood | No live reading | Not available | Moderate |
| Sycamore | No live reading | Not available | Moderate |
| Shorewood | No live reading | Not available | Moderate |
| Palos Hills | No live reading | Not available | Moderate |
| Bourbonnais | No live reading | Not available | Moderate |
| Jacksonville | No live reading | Not available | Moderate |
| Charleston | No live reading | Not available | Moderate |
| Cahokia Heights | No live reading | Not available | Moderate |
| Hinsdale | No live reading | Not available | Moderate |
| Dixon | No live reading | Not available | Moderate |
| Warrenville | No live reading | Not available | Moderate |
| Midlothian | No live reading | Not available | Moderate |
| Hazel Crest | No live reading | Not available | Moderate |
| Canton | No live reading | Not available | Moderate |
| Western Springs | 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 |
| Rantoul | No live reading | Not available | Moderate |
| Streator | No live reading | Not available | Moderate |
| Schiller Park | No live reading | Not available | Moderate |
| Burr Ridge | No live reading | Not available | Moderate |
| White Hall | No live reading | Not available | Moderate |
| Niantic | No live reading | Not available | Moderate |
| Spring Grove | No live reading | Not available | Moderate |
| Long Grove | No live reading | Not available | Moderate |
| Astoria | No live reading | Not available | Moderate |
| Benton | No live reading | Not available | Moderate |
| Olney | No live reading | Not available | Moderate |
| Savoy | No live reading | Not available | Moderate |
| Manteno | No live reading | Not available | Moderate |
| Clarendon Hills | No live reading | Not available | Moderate |
| Girard | No live reading | Not available | Moderate |
| Sugar Grove | No live reading | Not available | Moderate |
| Willowbrook | No live reading | Not available | Moderate |
| West Peoria | No live reading | Not available | Moderate |
| Palos Park | No live reading | Not available | Moderate |
| Mettawa | No live reading | Not available | Moderate |
| Geneseo | No live reading | Not available | Moderate |
| Mahomet | No live reading | Not available | Moderate |
| Sullivan | No live reading | Not available | Moderate |
| Highwood | No live reading | Not available | Moderate |
| Dawson | No live reading | Not available | Moderate |
| Downs | No live reading | Not available | Moderate |
| Red Bud | No live reading | Not available | Moderate |
| Olympia Fields | No live reading | Not available | Moderate |
| Fithian | No live reading | Not available | Moderate |
| Paris | No live reading | Not available | Moderate |
| Pittsfield | No live reading | Not available | Moderate |
| Burlington | No live reading | Not available | Moderate |
| Lincolnshire | No live reading | Not available | Moderate |
| Tennessee | 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 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.