Portland, OR Birch Pollen
Birch pollen in Portland usually peaks around April, reaching High at its worst. Portland's mild, wet climate gives it an early, drawn-out tree season and a famously heavy grass season, fed by the grass-seed farms of the Willamette Valley just to the south.
Birch follows in spring and often triggers oral allergy symptoms with apples and stone fruit.
Birch in Portland today
Monday, July 27, 2026
Birch pollen by month in Portland
How birch usually runs across the year. The current month is outlined.
Managing birch season in Portland
If birch is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the April peak, rather than waiting for symptoms. Keep windows closed on high-count mornings, shower and change clothes after time outside, and run the AC on recirculate in the car.
When symptoms don't ease with over-the-counter medicine, an allergist in Oregon can test whether birch is really what you react to and talk through longer-term options like allergy shots.
Sources
- American College of Allergy, Asthma & Immunology (ACAAI). "Tree Allergy." https://acaai.org/allergies/allergic-conditions/tree-pollen/
- American Academy of Allergy, Asthma & Immunology (AAAAI). "Pollen-Food Allergy Syndrome (Oral Allergy Syndrome)." https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/pfas-oral-allergy-syndrome
More pollen in Portland
- Portland grass pollen — peaks June.
- Portland alder pollen — peaks March.
- Portland ragweed pollen — peaks August to September.
- Portland pollen calendar — every allergen, month by month.
- Portland pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- Oregon pollen season — the statewide calendar and other cities.
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Sign up for free alertsSeasonal pattern based on Oregon pollen data and local sources. Today's reading updated daily. MyPollenPal