Check today's pollen count by city in Connecticut. Explore local allergy forecasts, monitor common seasonal allergens, and use city-level trends to plan around high pollen days.
Allergy Ava organizes statewide and local pollen information so you can compare conditions, anticipate seasonal flare-ups, and find relevant allergy forecast pages faster.
Today's pollen count in Connecticut
Pollen levels in Connecticut can vary by city, weather, vegetation, and season. Choose a local forecast below to see the current allergy index, main allergen, and 5-day outlook for cities including Hartford, Stamford, New Haven, Waterbury, Norwalk, Danbury.
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Preparing today's Connecticut pollen dashboard
Local allergy care
Allergists near Connecticut
Use today's pollen forecast alongside nearby allergy and immunology profiles when symptoms need clinical follow-up, testing, or long-term treatment planning.
Showing 6 of 16 published allergist profiles in this area.
About Pollen in Connecticut
Connecticut allergy sufferers can use this page to monitor pollen trends and find relevant city forecasts when available. Pollen levels vary by season, with tree pollen often peaking in spring, grass pollen becoming more active in late spring and summer, and weed pollen, especially ragweed, remaining a concern in late summer and fall.
Use Allergy Ava's city-level forecasts to plan outdoor activities, manage medication timing, and stay informed about the allergens most prevalent in your area. Our data is updated regularly to give you the most accurate picture of current conditions.
Frequently asked questions about Connecticut pollen forecasts
Does Long Island Sound delay pollen along the Connecticut coast?
Cool marine air can slow spring warming in Stamford, Norwalk, and New Haven compared with inland locations. The effect changes with wind direction, so a warm offshore wind may erase the coastal temperature difference for a day.
Why can Connecticut’s tree pollen peak so suddenly?
Several hardwood species respond to the same stretch of warm spring weather. When maple, birch, oak, and other trees release pollen close together, counts can rise sharply instead of increasing gradually.
How late does ragweed remain active in Connecticut?
Ragweed flowers from August into October. Its season usually ends after frost, but coastal Connecticut may remain frost-free longer than some inland valleys and higher locations.
Are October allergies more likely to be ragweed or mold?
Either may be involved. Ragweed can persist into October, while damp leaves and decaying vegetation provide fall mold sources. Because standard pollen forecasts may not include mold spores, the pollen breakdown alone may not explain every symptom.
Today's statewide signal
Connecticut pollen shifts between the Sound and inland hills
Connecticut’s coastline, river valleys, wooded suburbs, and inland elevations can reach the same allergy season at different times. Compare pollen and weather across six cities to see whether spring trees, summer grass, or fall ragweed is leading today.
Data updates regularly to reflect current conditions across Connecticut cities.
Stamford and Norwalk receive moderating air from Long Island Sound, while inland Danbury can warm more quickly during sunny spring weather. Mature suburban trees and extensive lawns contribute several overlapping pollen sources.
OakBirchGrass pollenRagweed
Index
1
Humidity
94%
Wind
2
Central Connecticut and the Naugatuck Valley
Hartford’s Connecticut River setting and Waterbury’s hillier inland terrain create different daily temperatures and wind patterns. Maple begins the tree season before oak, grasses, and ragweed take over in sequence.
MapleOakGrass pollenRagweed
Index
2
Humidity
93%
Wind
2
New Haven and the south-central coast
New Haven combines coastal weather with an urban tree canopy, parks, and wooded neighbourhoods. Sound breezes can change exposure during the day, but oak, birch, and grass pollen remain important seasonal triggers.
OakBirchGrass pollenOutdoor mold
Index
1
Humidity
92%
Wind
3
State-specific pollen calendar
When major allergens are active in Connecticut
Spring trees
March to May
MarAprMay
Maple appears early, followed by birch, oak, and other hardwoods. Several species may overlap after a rapid April warmup.
Summer grasses
June to July
JunJul
Grass pollen rises across lawns, parks, fields, and roadsides after the tree season begins to ease.
Ragweed season
August to October
AugSepOct
Common ragweed flowers from August through October and releases large amounts of lightweight, wind-dispersed pollen.
Fall mold
September to November
SepOctNov
Damp soil, fallen leaves, and decaying vegetation provide outdoor mold sources after much of the plant-pollen season has declined.
Weather-pollen correlation
What weather means for today's allergy risk
Wind can disperse pollen, rain can temporarily wash particles down, and humidity can increase mold irritation. The city table combines pollen and weather signals so users can compare outdoor risk without opening every city page.
