Mosquito season in Guilford County, NC: when it starts and ends
Mosquito months in Guilford County
In a normal year mosquito season in Guilford County, NC starts around March 22 and ends around November 14, about 34 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Guilford County, and when
- Start tipping out standing water weekly by March 8.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 14.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk June to September, more so if over 60.
Guilford County against the rest of NC
Guilford County has the 54th longest season of 100 NC counties, at 237 days against 292 in Carteret County and 176 in Ashe County. Its mean temperature is 59.8°F.
- Alexander County: March 20 to November 12 (237 days, 0 WNV)
- Caswell County: March 20 to November 12 (237 days, 0 WNV)
- Jones County: March 24 to November 16 (237 days, 0 WNV)
- Hoke County: March 22 to November 13 (236 days, 0 WNV)
West Nile in Guilford County
From 1999 to 2025, CDC ArboNET counted 9 human West Nile cases in Guilford County (8 neuroinvasive) across 6 years. The worst was 2025 with 2; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.