FleaDates › Flea season › Wisconsin › Green Bay
Green Bay · WI
When does flea season start in Green Bay?
Flea season in Green Bay typically runs late April to mid-October, peaking Jun–Sep.
Ticks in Green Bay
Local tick activity typically runs late March to mid-November, heaviest May–Sep. The species to know in Wisconsin: blacklegged (deer) tick, American dog tick.
More on species and timing: Wisconsin tick season.
Numbers come from NOAA U.S. Climate Normals (1991–2020) recorded at GREEN BAY — a climate-based estimate; real years wobble.
Frequently asked questions
When does flea season start in Green Bay?
Around late April 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 Green Bay different from the rest of Wisconsin?
Not meaningfully — Green Bay tracks the Wisconsin statewide estimate closely. Both are climate-based estimates, so treat the edges as fuzzy, not exact.
Do dogs in Green Bay 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 Wisconsin are typically active late March to mid-November, a longer window than fleas get.