Mosquito season in Norfolk city, VA: when it starts and ends
Mosquito months in Norfolk city
In a normal year mosquito season in Norfolk city, VA starts around March 15 and ends around November 26, about 37 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Norfolk city, and when
- Start tipping out standing water weekly by March 1.
- Book any yard treatment for mid March, ahead of the July peak.
- Repellent can go away after November 26.
- 7 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Norfolk city against the rest of VA
Norfolk city has the 1st longest season of 133 VA counties, at 257 days against 257 in Norfolk city and 172 in Highland County. Its mean temperature is 61.1°F.
- Portsmouth city: March 15 to November 25 (255 days, 0 WNV)
- Chesapeake city: March 17 to November 22 (250 days, 4 WNV)
West Nile in Norfolk city
From 1999 to 2025, CDC ArboNET counted 14 human West Nile cases in Norfolk city (11 neuroinvasive) across 8 years. The worst was 2018 with 3; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.