Connecticut's compact geography and deciduous forests create intense spring tree pollen seasons, with birch and oak as primary triggers. Fall ragweed season is also significant.
Peak pollen season in Connecticut: April–September. Primary allergens: BirchOakRagweed
Tree pollen is the first major allergen each year in Connecticut, typically starting in early spring with cedar and alder, followed by oak and birch through May.
Grass pollen takes over in late spring through early summer, peaking from May to July depending on location within the state.
Ragweed dominates fall allergies in Connecticut, typically from August through October. It's the most widespread fall allergen in the US.
The pollen count in Connecticut varies by city and season. Peak pollen season runs April–September. Select a city above for live data.
Pollen levels vary across Connecticut. Cities in warmer, more humid areas typically see higher counts. Check individual city pages for current levels.
Pollen season in Connecticut peaks in April–September. Tree pollen starts in late winter, followed by grass in summer and ragweed in fall.