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Southeast · WV
When does flea season start in West Virginia?
Flea season in West Virginia typically runs late March to mid-November, with the heaviest pressure May–Sep. Outside that window outdoor fleas slow down — they don't disappear.
The West Virginia flea picture
West Virginia's mountain winters — averaging in the 30s from December through February — impose a genuine outdoor flea hiatus. The season that follows is compact but intense: activity climbs through spring and holds at its height from June through September in the valleys around Charleston and Huntington. Compact or not, fleas that made it indoors by fall will breed all winter in a warm house, so vets here still recommend twelve months of protection.
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 West Virginia
| Month | Typical pressure | Average temperature |
|---|---|---|
| January | Quiet | 33.9°F |
| February | Quiet | 37.1°F |
| March | Low | 45°F |
| April | Moderate | 56°F |
| May | High | 64.2°F |
| June | Peak | 71.8°F |
| July | Peak | 75.4°F |
| August | Peak | 74.2°F |
| September | Peak | 67.8°F |
| October | Moderate | 56.6°F |
| November | Low | 46°F |
| December | Quiet | 37.9°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near West Virginia'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 West Virginia — check the city closest to you:
Ticks are a different calendar. In West Virginia tick activity typically runs mid-February to mid-December — see the West Virginia tick season page.
Frequently asked questions
When does flea season start in West Virginia?
Around late 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 West Virginia?
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 West Virginia?
Yes — veterinary organizations recommend year-round prevention everywhere, West Virginia 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 West Virginia?
Ticks run on their own, earlier calendar — in West Virginia that's mid-February to mid-December. See the West Virginia tick season page for the month-by-month picture and the species involved.