Iowa Pollen by City

Iowa's cities read the continental Plains pollen calendar: tree pollen peaks Mar–May, grass May–Jul, and ragweed Aug–Nov — the country's worst ragweed — the continental Plains run a long, severe late-summer-into-fall weed season on top of the usual tree and grass peaks. Every city below has its own page with today’s verdict and the full 12-month season calendar.

Cities in Iowa

7 cities with a pollen page, largest first

CityTree pollen seasonPopulation
Des MoinesMar–May570,091
DavenportMar–May281,044
AltoonaMar–May21,495
FairfieldMar–May9,456
ManningMar–May1,533
GilmanMar–May623
LamontMar–May514

Our dataset lists 1,024 places in Iowa; the 7 above have a page. For a smaller town, the nearest city above is the closest match.