Los Angeles, CA Ragweed Pollen
Ragweed pollen in Los Angeles usually peaks around August to September, reaching Moderate at its worst. Los Angeles has a mild, drawn-out allergy season rather than a sharp one: olive and oak in spring, mulberry alongside them, grass through late spring, and scattered weed pollen much of the year.
Ragweed and related weeds turn up in late summer and fall, lighter than in the eastern US.
Ragweed in Los Angeles today
Monday, July 27, 2026
Ragweed pollen by month in Los Angeles
How ragweed usually runs across the year. The current month is outlined.
Managing ragweed season in Los Angeles
If ragweed is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the August to September 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 ragweed is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in Los Angeles
- Los Angeles grass pollen — peaks April to May.
- Los Angeles oak pollen — peaks April.
- Los Angeles mulberry pollen — peaks March and April.
- Los Angeles olive pollen — peaks March to April.
- Los Angeles pollen calendar — every allergen, month by month.
- Los Angeles 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