FleaDates › Flea season › Virginia
Southeast · VA
When does flea season start in Virginia?
Flea season in Virginia typically runs mid-March to late November, with the heaviest pressure Apr–Oct. Outside that window outdoor fleas slow down — they don't disappear.
The Virginia flea picture
Virginia's flea curve gets moving by mid-March, hits its stride from April through September, and doesn't fade until late November. Tidewater humidity gives Norfolk dogs a longer, stickier season than their counterparts in the Roanoke Valley, but the difference is timing, not exemption. Winter cold quiets the yard without touching the flea population wintering in heated homes — a pause in prevention is the one pause Virginia vets say not to take.
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 Virginia
| Month | Typical pressure | Average temperature |
|---|---|---|
| January | Quiet | 39.5°F |
| February | Low | 42°F |
| March | Low | 49.1°F |
| April | High | 58.8°F |
| May | Peak | 67°F |
| June | Peak | 75.2°F |
| July | Peak | 79.4°F |
| August | Peak | 77.6°F |
| September | Peak | 71.6°F |
| October | High | 60.9°F |
| November | Moderate | 50.4°F |
| December | Low | 42.9°F |
Estimates from NOAA U.S. Climate Normals (1991–2020), averaged across 3 weather stations near 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 Virginia — check the city closest to you:
Ticks are a different calendar. In Virginia tick activity typically runs year-round — see the Virginia tick season page.
Frequently asked questions
When does flea season start in Virginia?
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 Virginia?
Outdoor flea pressure typically fades around late 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 Virginia?
Yes — veterinary organizations recommend year-round prevention everywhere, 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 Virginia?
Ticks run on their own, earlier calendar — in Virginia that's year-round. See the Virginia tick season page for the month-by-month picture and the species involved.