Pennsylvania Pollen by City

Pennsylvania's cities read the cold-temperate Northeast pollen calendar: tree pollen peaks Mar–May, grass May–Jul, and ragweed Aug–Oct — a sharply defined calendar — a hard winter lull, then a compact spring tree burst before grass and a long ragweed fall. Every city below has its own page with today’s verdict and the full 12-month season calendar.

Cities in Pennsylvania

17 cities with a pollen page, largest first

CityTree pollen seasonPopulation
PhiladelphiaMar–May5,782,653
PittsburghMar–May1,729,616
AllentownMar–May644,758
HarrisburgMar–May510,827
LancasterMar–May407,719
ScrantonMar–May366,238
ReadingMar–May283,546
YorkMar–May244,270
BloomsburgMar–May13,024
HarleysvilleMar–May9,090
GettysburgMar–May8,254
West WyomingMar–May2,662
Penn FarmsMar–May2,508
EffortMar–May1,743
SligoMar–May731
Guys MillsMar–May268
SlickvilleMar–May147

Our dataset lists 1,886 places in Pennsylvania; the 17 above have a page. For a smaller town, the nearest city above is the closest match.