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