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Las Vegas sits in the Mojave Desert, and while its arid climate might suggest relief for allergy sufferers, the valley is actually one of the more challenging environments in the U.S. due to widespread ornamental landscaping, persistent winds, and year-round pollen activity.
Tree pollen kicks off the season early, often in February, and peaks from March through May. Common offenders include mulberry, olive, ash, elm, cottonwood, and juniper—so problematic that Clark County has banned new plantings of mulberry and olive trees.
As trees taper off, grass pollen ramps up from late April through summer, with Bermuda grass dominating along with ryegrass and fescue. Because Bermuda can pollinate well into fall, it often overlaps with weed season, intensifying symptoms during late summer.
Weeds take over from late August through October, led by ragweed, tumbleweed (Russian thistle), sagebrush, pigweed, and saltbush—all thriving in the surrounding desert.
Beyond pollen, Las Vegas residents contend with significant dust from desert winds, indoor and outdoor mold in irrigated landscapes, and air pollution trapped by the valley's geography. The extreme dryness can also irritate nasal passages, worsening reactions.
Overall, Las Vegas's allergy profile is defined by an extended pollen calendar, desert weeds, and persistent dust.