Connecticut pollen and allergy seasons
July outlookModerate
Connecticut has a spring tree season and a strong ragweed season in late summer and early fall.
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 Connecticut
| City | Today | Worst today | Typical in July |
|---|---|---|---|
| Waterbury | Very Highas of Jul 15 | Grass | Moderate |
| Danbury | Very Highas of Jul 15 | Grass | Moderate |
| Stamford | Very Highas of Jul 15 | Grass | Moderate |
| Naugatuck | Very Highas of Jul 15 | Grass | Moderate |
| Ansonia | Very Highas of Jul 15 | Grass | Moderate |
| Derby | Very Highas of Jul 15 | Grass | Moderate |
| Barkhamsted | Very Highas of Jul 15 | Grass | Moderate |
| Darien | Very Highas of Jul 15 | Grass | Moderate |
| Westport | Very Highas of Jul 15 | Grass | Moderate |
| Middlebury | Very Highas of Jul 15 | Grass | Moderate |
| Wilton | Very Highas of Jul 15 | Grass | Moderate |
| New Milford | Very Highas of Jul 15 | Grass | Moderate |
| Trumbull | Very Highas of Jul 15 | Grass | Moderate |
| Milford | Very Highas of Jul 15 | Grass | Moderate |
| Oxford | Very Highas of Jul 15 | Grass | Moderate |
| Salisbury | Very Highas of Jul 15 | Grass | Moderate |
| Fairfield | Very Highas of Jul 15 | Grass | Moderate |
| New Canaan | Very Highas of Jul 15 | Grass | Moderate |
| Greenwich | Very Highas of Jul 15 | Grass | Moderate |
| Southbury | Very Highas of Jul 15 | Grass | Moderate |
| Kent | Very Highas of Jul 15 | Grass | Moderate |
| Old Greenwich | Very Highas of Jul 15 | Grass | Moderate |
| Lakeville | Highas of Jul 15 | Grass | Moderate |
| Weston | Highas of Jul 15 | Grass | Moderate |
| Litchfield | Highas of Jul 15 | Grass | Moderate |
| Bethel | Highas of Jul 15 | Grass | Moderate |
| Newtown | Highas of Jul 15 | Grass | Moderate |
| Sherman | Highas of Jul 15 | Grass | Moderate |
| Bridgeport | Moderateas of Jul 15 | Grass | Moderate |
| Norwalk | Moderateas of Jul 15 | Grass | Moderate |
| Shelton | Moderateas of Jul 15 | Grass | Moderate |
| Torrington | Moderateas of Jul 15 | Grass | Moderate |
| New Preston Marble Dale | Moderateas of Jul 15 | Grass | Moderate |
| Washington Depot | Moderateas of Jul 15 | Grass | Moderate |
| Watertown | Moderateas of Jul 15 | Grass | Moderate |
| Cos Cob | Moderateas of Jul 15 | Grass | Moderate |
| Seymour | Moderateas of Jul 15 | Grass | Moderate |
| Wolcott | Moderateas of Jul 15 | Grass | Moderate |
| Ridgefield | Moderateas of Jul 15 | Grass | Moderate |
| New Fairfield | Moderateas of Jul 15 | Grass | Moderate |
| Woodbury | Moderateas of Jul 15 | Grass | Moderate |
| Winsted | Moderateas of Jul 15 | Grass | Moderate |
| Stratford | Moderateas of Jul 15 | Grass | Moderate |
| Granby | Moderateas of Jul 15 | Grass | Moderate |
| Harwinton | Moderateas of Jul 15 | Grass | Moderate |
| Hartford | Noneas of Jul 15 | None | Moderate |
| New Haven | Noneas of Jul 15 | None | Moderate |
| Norwich | Noneas of Jul 15 | None | Moderate |
| New Britain | Noneas of Jul 15 | None | Moderate |
| Bristol | Noneas of Jul 15 | None | Moderate |
| Meriden | Noneas of Jul 15 | None | Moderate |
| West Haven | Noneas of Jul 15 | None | Moderate |
| Middletown | Noneas of Jul 15 | None | Moderate |
| New London | Noneas of Jul 15 | None | Moderate |
| Wallingford Center | Noneas of Jul 15 | None | Moderate |
| Willimantic | Noneas of Jul 15 | None | Moderate |
| Storrs | Noneas of Jul 15 | None | Moderate |
| Essex | Noneas of Jul 15 | None | Moderate |
| Suffield | Noneas of Jul 15 | None | Moderate |
| Westbrook | Noneas of Jul 15 | None | Moderate |
| Berlin | Noneas of Jul 15 | None | Moderate |
| Killingworth | Noneas of Jul 15 | None | Moderate |
| Plainfield | Noneas of Jul 15 | None | Moderate |
| Dayville | Noneas of Jul 15 | None | Moderate |
| Coventry | Noneas of Jul 15 | None | Moderate |
| East Haddam | Noneas of Jul 15 | None | Moderate |
| Voluntown | Noneas of Jul 15 | None | Moderate |
| Woodstock | Noneas of Jul 15 | None | Moderate |
| Simsbury | Noneas of Jul 15 | None | Moderate |
| Amston | Noneas of Jul 15 | None | Moderate |
| Windsor | Noneas of Jul 15 | None | Moderate |
| Childrens Village Of The Hartford Orphan Asylum | Noneas of Jul 15 | None | Moderate |
| Avon | Noneas of Jul 15 | None | Moderate |
| Vernon Rockville | Noneas of Jul 15 | None | Moderate |
| East Granby | Noneas of Jul 15 | None | Moderate |
| East Haven | Noneas of Jul 15 | None | Moderate |
| Plymouth | Noneas of Jul 15 | None | Moderate |
| Southington | Noneas of Jul 15 | None | Moderate |
| Manchester | Noneas of Jul 15 | None | Moderate |
| Lebanon | Noneas of Jul 15 | None | Moderate |
| South Glastonbury | Noneas of Jul 15 | None | Moderate |
| Waterford | Noneas of Jul 15 | None | Moderate |
| Groton | Noneas of Jul 15 | None | Moderate |
| Newington | Noneas of Jul 15 | None | Moderate |
| Sterling | Noneas of Jul 15 | None | Moderate |
| Enfield | Noneas of Jul 15 | None | Moderate |
| Thomaston | Noneas of Jul 15 | None | Moderate |
| Marlborough | Noneas of Jul 15 | None | Moderate |
| Wallingford | Noneas of Jul 15 | None | Moderate |
| Old Saybrook | Noneas of Jul 15 | None | Moderate |
| Plantsville | Noneas of Jul 15 | None | Moderate |
| North Haven | Noneas of Jul 15 | None | Moderate |
| Unionville | Noneas of Jul 15 | None | Moderate |
| South Windsor | Noneas of Jul 15 | None | Moderate |
| Glastonbury | Noneas of Jul 15 | None | Moderate |
| Northford | Noneas of Jul 15 | None | Moderate |
| Orange | Noneas of Jul 15 | None | Moderate |
| Farmington | Noneas of Jul 15 | None | Moderate |
| Windsor Locks | Noneas of Jul 15 | None | Moderate |
| West Hartford | Noneas of Jul 15 | None | Moderate |
| East Hampton | Noneas of Jul 15 | None | Moderate |
| Wethersfield | Noneas of Jul 15 | None | Moderate |
| Bloomfield | Noneas of Jul 15 | None | Moderate |
| Niantic | Noneas of Jul 15 | None | Moderate |
| Portland | Noneas of Jul 15 | None | Moderate |
| Madison | Noneas of Jul 15 | None | Moderate |
| Chester | Noneas of Jul 15 | None | Moderate |
| Woodbridge | Noneas of Jul 15 | None | Moderate |
| North Branford | Noneas of Jul 15 | None | Moderate |
| Bethany | Noneas of Jul 15 | None | Moderate |
| Guilford | Noneas of Jul 15 | None | Moderate |
| Cheshire | Noneas of Jul 15 | None | Moderate |
| Ashford | Noneas of Jul 15 | None | Moderate |
| Killingly Center | Noneas of Jul 15 | None | Moderate |
| Burlington | Noneas of Jul 15 | None | Moderate |
| Mansfield Four Corners | Noneas of Jul 15 | None | Moderate |
| Putnam | Noneas of Jul 15 | None | Moderate |
| Deep River | Noneas of Jul 15 | None | Moderate |
| Branford | Noneas of Jul 15 | None | Moderate |
| Stafford | Noneas of Jul 15 | None | Moderate |
| Milford city | No live reading | Not available | Moderate |
| Canterbury | No live reading | Not available | Moderate |
| East Hartford | No live reading | Not available | Moderate |
| Bolton | No live reading | Not available | Moderate |
| Cromwell | No live reading | Not available | Moderate |
| Durham | No live reading | Not available | Moderate |
| Mystic | No live reading | Not available | Moderate |
| Hamden | No live reading | Not available | Moderate |
| Monroe | No live reading | Not available | Moderate |
| Old Lyme | No live reading | Not available | Moderate |
| Thompson | No live reading | Not available | Moderate |
| Andover | No live reading | Not available | Moderate |
| Ellington | No live reading | Not available | Moderate |
| Rocky Hill | 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 Connecticut allergy season
Allergy levels in Connecticut 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 Connecticut?
Pollen levels in Connecticut usually begin climbing in March and reach their highest point in September.
What is the worst month for allergies in Connecticut?
September is typically the worst month in Connecticut, driven by ragweed pollen.
When does ragweed season end in Connecticut?
Ragweed pollen in Connecticut usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Connecticut?
January usually brings the lowest pollen levels of the year in Connecticut.