Kansas City, MO Pollen Levels Today

Kansas City, Missouri sits in a humid continental climate zone where four distinct seasons and a position along the Missouri River create a prolonged and varied allergy calendar, consistently ranking the metro among the more challenging U.S. cities for pollen sufferers.

Tree pollen kicks off the season in early March and peaks through April and into May, driven by oak, maple, cedar, elm, cottonwood, hickory, walnut, and sycamore, all of which thrive across the region's wooded neighborhoods and river corridors.

As tree counts taper, grass pollen takes over from May through July, with Kentucky bluegrass, timothy, Bermuda, orchard grass, and fescue generating the heaviest loads—often overlapping late-season trees in May to intensify symptoms.

Weed season follows from mid-August through the first hard freeze in October or November, dominated by ragweed, which is especially prolific across Missouri's open fields and roadsides, alongside pigweed, lamb's quarters, sagebrush, and plantain.

Beyond pollen, Kansas City's humid summers and damp springs promote outdoor and indoor mold (particularly Alternaria and Cladosporium), while dust mites, agricultural dust drifting in from surrounding farmland, and periodic ozone spikes add year-round triggers.

Overall, the city's profile is defined by a long, overlapping season with heavy tree, grass, ragweed, and mold exposure.