Fresno, CA Oak Pollen
Oak pollen in Fresno usually peaks around April, reaching High at its worst. Fresno sits in the heart of the San Joaquin Valley, whose bowl-like geography traps airborne pollen for weeks. Spring brings several heavy tree allergens together: olive, oak, and mulberry, followed by grass into summer.
Valley and foothill oaks drive part of the Fresno spring, peaking in April.
Oak in Fresno today
Tuesday, July 28, 2026
Oak pollen by month in Fresno
How oak usually runs across the year. The current month is outlined.
Managing oak season in Fresno
If oak 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 California can test whether oak is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in Fresno
- Fresno grass pollen — peaks April to May.
- Fresno mulberry pollen — peaks March and April.
- Fresno olive pollen — peaks March to April.
- Fresno ragweed pollen — peaks August to September.
- Fresno pollen calendar — every allergen, month by month.
- Fresno pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- California pollen season — the statewide calendar and other cities.
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Sign up for free alertsSeasonal pattern based on California pollen data and local sources. Today's reading updated daily. MyPollenPal