Michigan's dense forests and Great Lakes climate create strong birch and tree pollen seasons in spring. Grass pollen peaks June-July, while ragweed affects much of the state through September.
Peak pollen season in Michigan: April–September. Primary allergens: BirchGrassRagweed
Tree pollen is the first major allergen each year in Michigan, 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 Michigan, typically from August through October. It's the most widespread fall allergen in the US.
The pollen count in Michigan varies by city and season. Peak pollen season runs April–September. Select a city above for live data.
Pollen levels vary across Michigan. Cities in warmer, more humid areas typically see higher counts. Check individual city pages for current levels.
Pollen season in Michigan peaks in April–September. Tree pollen starts in late winter, followed by grass in summer and ragweed in fall.