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