Greensboro, NC Pollen Levels Today

Greensboro sits in the Piedmont region of North Carolina, where a humid subtropical climate, mild winters, and dense mixed hardwood forests combine to produce one of the more challenging allergy environments in the Southeast.

Tree pollen typically kicks off the season in late February and peaks from March through April, driven by oak, pine, cedar, birch, maple, sweetgum, and sycamore—with the yellow pine dust being especially visible on cars and porches.

As tree counts taper in May, grass pollen takes over, peaking from late May through July, with Bermuda, Timothy, orchard, and fescue grasses dominating local lawns and roadsides.

Weed season follows in late summer and fall, running from August through the first hard frost, and is led by ragweed, along with lamb's quarters, pigweed, and plantain.

Overlap between late tree pollen and early grass pollen in May, and between late grass and early ragweed in August, often intensifies symptoms for sensitive individuals.

Beyond pollen, Greensboro's humidity fuels persistent outdoor and indoor mold (notably Cladosporium and Alternaria), while dust mites thrive year-round and regional ozone can aggravate symptoms in summer.

Overall, Greensboro's allergy profile is defined by a long, overlapping season dominated by tree pollen, ragweed, and humidity-driven mold.