FleaDates › Flea season › Nevada
Mountain West · NV
When does flea season start in Nevada?
Flea season in Nevada typically runs mid-March to mid-November, with the heaviest pressure May–Sep. Outside that window outdoor fleas slow down — they don't disappear.
The Nevada flea picture
Nevada splits three ways — Las Vegas heat, Reno's high-desert swings, Elko's colder northern basins — and statewide the flea window runs mid-March to mid-November. March and April stay modest, May climbs, and June through September holds at peak, when shaded irrigated yards supply the humidity the surrounding desert refuses to. Dry air is hard on eggs and larvae outdoors but does nothing to them under a couch or along a carpeted hallway, which is exactly why December and January belong on the prevention calendar too.
One thing that's true in every state: indoor fleas are year-round everywhere. A heated house in January is a fine flea nursery, which is why the calendar above describes outdoor pressure — not whether fleas are possible.
Month-by-month flea pressure in Nevada
| Month | Typical pressure | Average temperature |
|---|---|---|
| January | Quiet | 37.8°F |
| February | Quiet | 41.9°F |
| March | Low | 49.1°F |
| April | Moderate | 55°F |
| May | High | 63.9°F |
| June | Peak | 73.3°F |
| July | Peak | 80.8°F |
| August | Peak | 78.8°F |
| September | Peak | 70.3°F |
| October | Moderate | 57.6°F |
| November | Low | 45.6°F |
| December | Quiet | 37°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near Nevada's larger cities, with activity thresholds from published veterinary and entomology research. Real years run early or late with the weather.
Flea season near you
Climate shifts even within Nevada — check the city closest to you:
Ticks are a different calendar. In Nevada tick activity typically runs late January to mid-December — see the Nevada tick season page.
Frequently asked questions
When does flea season start in Nevada?
Around mid-March in a typical year, once average temperatures hold around 50°F — the point where fleas begin reproducing in earnest outdoors. Warm springs pull that earlier, which is a good argument for not waiting.
When does flea season end in Nevada?
Outdoor flea pressure typically fades around mid-November, when sustained cold shuts down reproduction outside. Indoors is another story — heated homes stay flea-friendly all winter.
Does my dog need flea prevention in winter in Nevada?
Yes — veterinary organizations recommend year-round prevention everywhere, Nevada included. Fleas overwinter indoors on pets and in bedding regardless of the weather outside, and a warm snap can restart outdoor activity early. The season calendar tells you when to be extra vigilant, not when to stop.
What about ticks in Nevada?
Ticks run on their own, earlier calendar — in Nevada that's late January to mid-December. See the Nevada tick season page for the month-by-month picture and the species involved.