Seattle Pollen Forecast — Available Days
Daily values appear only when supplied by the data provider. A seasonal estimate is not a daily forecast.
Seasonal Allergen Guide for Seattle
General seasonal information; this list does not show which pollen is elevated today.
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Alder
Alder is one of the first trees to pollinate each year, sometimes releasing pollen as early as january.
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Birch
Birch pollen is among the most allergenic of all tree pollens, triggering symptoms in up to 25% of allergy sufferers.
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Grass
Grass pollen affects more americans than any other allergen — over 40 million people are sensitive to it.
Pollen Count Seattle — What You Need to Know
The pollen count in Seattle peaks in March–June. The Pacific Northwest is known for its intense alder and birch pollen seasons, plus some of the highest grass pollen counts in the US.
Why Is Pollen High in Seattle?
The primary allergen is Alder — alder is one of the first trees to pollinate each year, sometimes releasing pollen as early as January. Pollen spikes on warm, dry, and windy days. Rain temporarily clears the air, but counts rebound fast.
Pollen Season in Seattle
- Tree pollen — starts in late winter, peaks April–May. Birch, oak, and cedar are the biggest triggers.
- Grass pollen — peaks late spring through early summer. Affects over 40 million Americans.
Frequently Asked Questions
What is the pollen count in Seattle today?
Check the data status above for Seattle. Provider forecast levels appear only when available. A seasonal estimate is not today's measured pollen count.
What type of pollen is high in Seattle right now?
The seasonal guide does not establish which pollen is high right now. Current plant-specific levels are not supplied by the seasonal estimate.
When is pollen season in Seattle?
Pollen season in Seattle typically peaks in March–June. Tree pollen starts in late winter, followed by grass pollen in late spring through summer, with minimal ragweed impact in this region.
What should I do when pollen is high in Seattle?
On high pollen days in Seattle: check the forecast before going outside, schedule outdoor activities for the afternoon (pollen peaks 5–10 AM), keep windows closed and use AC, take antihistamines before exposure rather than after symptoms start, and shower after spending time outdoors to remove pollen from skin and hair.
How accurate is the pollen forecast for Seattle?
Provider forecasts are estimates, not measurements at your address. When provider data is unavailable, this page may show a broad seasonal estimate. Missing daily forecasts remain blank; no accuracy guarantee is made.