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Trenton · NJ
When does flea season start in Trenton?
Flea season in Trenton typically runs early April to early November, peaking May–Sep.
Ticks in Trenton
Local tick activity typically runs early March to mid-December, heaviest Apr–Oct. The species to know in New Jersey: blacklegged (deer) tick, lone star tick, American dog tick.
More on species and timing: New Jersey tick season.
Numbers come from NOAA U.S. Climate Normals (1991–2020) recorded at TRENTON MERCER CO AP — a climate-based estimate; real years wobble.
Frequently asked questions
When does flea season start in Trenton?
Around early 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 Trenton different from the rest of New Jersey?
Not meaningfully — Trenton tracks the New Jersey statewide estimate closely. Both are climate-based estimates, so treat the edges as fuzzy, not exact.
Do dogs in Trenton 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 New Jersey are typically active late February to mid-December, a longer window than fleas get.