Omaha, NE Pollen Levels Today

Omaha sits in the heart of the Great Plains, where a humid continental climate, strong prairie winds, and an agricultural surrounding landscape combine to produce a long and intense allergy season.

Tree pollen launches the year in late February and builds through May, with cedar and juniper starting early, followed by oak, maple, elm, cottonwood, birch, ash, and mulberry—species well-suited to the Missouri River valley and widely planted throughout the metro.

As trees wind down in late May, grass pollen takes over and remains problematic through July and into August, driven primarily by Kentucky bluegrass, timothy, orchard grass, Bermuda, and the remnants of native prairie grasses carried in on regional winds.

Late summer brings Omaha's most notorious allergy season: weed pollen, dominated by ragweed, which thrives in surrounding farmland and ditches from mid-August through the first hard frost in October, alongside pigweed, lamb's quarters, sagebrush, and Russian thistle. Overlap between grasses and early ragweed in August often intensifies symptoms.

Non-pollen triggers are also significant, with high summer humidity fueling outdoor mold spores, agricultural dust drifting in from nearby fields, and winter indoor dust mites.

Overall, Omaha's profile is defined by a prolonged tree season, persistent grasses, and especially punishing fall ragweed.