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