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Cincinnati · OH

When does flea season start in Cincinnati?

Flea season in Cincinnati typically runs late March to early November, peaking May–Sep.

Flea season late March to early November Peak May–Sep
January — Quiet February — Quiet March — Low April — Moderate May — High June — Peak July — Peak August — Peak September — Peak October — Moderate November — Low December — Quiet J F M A M J J A S O N D Cincinnati Peak May–Sep

Ticks in Cincinnati

Local tick activity typically runs late February to early December, heaviest Apr–Oct. The species to know in Ohio: blacklegged (deer) tick, American dog tick, lone star tick.

More on species and timing: Ohio tick season.

Numbers come from NOAA U.S. Climate Normals (1991–2020) recorded at CINCINNATI LUNKEN AP — a climate-based estimate; real years wobble.

Frequently asked questions

When does flea season start in Cincinnati?

Around late March in a typical year, once local averages hold around 50°F. A warm spring pulls it earlier — prevention shouldn't wait for the calendar.

Is flea season in Cincinnati different from the rest of Ohio?

Not meaningfully — Cincinnati tracks the Ohio statewide estimate closely. Both are climate-based estimates, so treat the edges as fuzzy, not exact.

Do dogs in Cincinnati need prevention outside flea season?

Yes — vets recommend year-round parasite prevention regardless of the local calendar. Indoor fleas ignore the weather entirely, and ticks in Ohio are typically active early March to early December, a longer window than fleas get.

Elsewhere in Ohio