Missouri sits at the intersection of several major pollen zones. Spring brings heavy oak and tree pollen, summer is dominated by grass, and the state sees some of the country's worst ragweed counts from August through October.
Peak pollen season in Missouri: April–September. Primary allergens: OakGrassRagweed
Tree pollen is the first major allergen each year in Missouri, 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 Missouri, typically from August through October. It's the most widespread fall allergen in the US.
The pollen count in Missouri varies by city and season. Peak pollen season runs April–September. Select a city above for live data.
Pollen levels vary across Missouri. Cities in warmer, more humid areas typically see higher counts. Check individual city pages for current levels.
Pollen season in Missouri peaks in April–September. Tree pollen starts in late winter, followed by grass in summer and ragweed in fall.