Anaheim, CA Pollen Levels Today

Anaheim's Mediterranean climate, with mild wet winters and long dry summers, creates a nearly year-round allergy season that is further amplified by Southern California's warm temperatures and occasional Santa Ana winds, which can carry pollen across the Orange County basin.

Tree pollen is typically the first major trigger, emerging as early as January and peaking from February through May; common culprits include coast live oak, sycamore, olive, mulberry, ash, and the widely planted non-native pines and cypresses found throughout local neighborhoods.

As trees taper off, grass pollen takes over from late April into August, with Bermuda grass, ryegrass, and Kentucky bluegrass being the dominant offenders in lawns, parks, and open fields.

Weed season follows in late summer and fall, running from August through October or November, and is driven by ragweed, pigweed, Russian thistle (tumbleweed), sagebrush, and lamb's quarters. Overlapping grass and weed seasons in late summer often intensify symptoms for multi-sensitive individuals.

Beyond pollen, Anaheim residents also contend with year-round dust mites, outdoor mold spores that spike after rare rain events, and elevated ozone and vehicle-related air pollution from the surrounding freeway network.

Overall, Anaheim's allergy profile is defined by extended exposure windows, diverse plant sources, and pollution-driven irritation.