FleaDates › Flea season › California › Fresno

Fresno · CA

When does flea season start in Fresno?

Flea season in Fresno typically runs late January to mid-December, peaking Apr–Oct.

Flea season late January to mid-December Peak Apr–Oct
January — Low February — Moderate March — Moderate April — High May — Peak June — Peak July — Peak August — Peak September — Peak October — Peak November — Moderate December — Low J F M A M J J A S O N D Fresno Peak Apr–Oct

Ticks in Fresno

Local tick activity typically runs year-round, heaviest Feb–Nov. The species to know in California: western blacklegged tick, American dog tick, brown dog tick.

More on species and timing: California tick season.

Numbers come from NOAA U.S. Climate Normals (1991–2020) recorded at FRESNO YOSEMITE INTL AP — a climate-based estimate; real years wobble.

Frequently asked questions

When does flea season start in Fresno?

Around late January 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 Fresno different from the rest of California?

Not meaningfully — Fresno tracks the California statewide estimate closely. Both are climate-based estimates, so treat the edges as fuzzy, not exact.

Do dogs in Fresno 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 California are typically active year-round, a longer window than fleas get.

Elsewhere in California