Pollen Count & Forecast for Cleveland

Cleveland’s spring allergy season (March-May) is dominated by Maple and Sycamore pollen; Red Maple (Acer rubrum) prolific in Rockefeller Park and Lake View Cemetery; American Sycamore (Platanus occidentalis) widespread across city streets and squares. Oak (Quercus) contributes significantly from the Cuyahoga Valley National Park. Summer (May-July) sees high Grass (Poaceae) pollen levels, originating from Edgewater Park and along Cuyahoga River riverbanks.

Lake Erie’s breeze carries pollen inland; the urban heat island effect extends the pollination season. Late summer and autumn see elevated Ragweed (Ambrosia) pollen and Mould (Alternaria, Cladosporium) spore counts, from the Ohio and Erie Canalway and decomposing leaf litter in the Cleveland Metroparks.