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Pollen Level
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Ann Arbor's allergy season is compressed but intense, running from April through October. The flat, agricultural landscape around Ann Arbor, MI produces significant grass and ragweed pollen during peak months.
Right now: September is peak ragweed in Ann Arbor. A single ragweed plant can release a billion pollen grains per season.
Spring
Apr – May
Tree pollen season is short but intense — oak, elm, and ash dominate.
Summer
May – Jul
Grass pollen peaks in June. Agricultural regions see elevated counts.
Fall
Aug – Oct
Ragweed is the dominant allergen. The Midwest is a major ragweed zone.
The flat terrain near Ann Arbor allows pollen to travel long distances on the wind. Cold fronts can temporarily drop counts, but warm spells bring rapid pollen surges. PollenTracker monitors these daily shifts.
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CAUTION
Limit exposure
Ragweed pollen is very high and 13 mph wind is making it worse. Keep windows closed and limit outdoor time.
Pollen: Ragweed pollen risk is very-high today; source reading: Google UPI 4/5 (High).
Lower-risk hours: 13:00, 16:00-17:00
Weather
53°F
Cloudy · 73% humidity · 13 mph wind
Google UPI 0/5
Google UPI 0/5