Mosquito season in La Paz County, AZ: when it starts and ends
Mosquito months in La Paz County
In a normal year mosquito season in La Paz County, AZ starts around January 7 and ends around December 21, about 50 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in La Paz County, and when
- Start tipping out standing water weekly by December 24.
- Book any yard treatment for early January, ahead of the July peak.
- Repellent can go away after December 21.
- 2 West Nile cases since 2016 (last 2022): you should use repellent at dusk April to October, more so if over 60.
La Paz County against the rest of AZ
La Paz County has the 3rd longest season of 15 AZ counties, at 348 days against 364 in Maricopa County and 150 in Coconino County. Its mean temperature is 73.1°F.
- Maricopa County: January 5 to January 4 (364 days, 1,999 WNV)
- Pinal County: January 8 to December 26 (352 days, 154 WNV)
- Yuma County: January 23 to December 11 (322 days, 8 WNV)
- Gila County: February 2 to December 7 (308 days, 9 WNV)
West Nile in La Paz County
From 1999 to 2025, CDC ArboNET counted 7 human West Nile cases in La Paz County (6 neuroinvasive) across 6 years. The worst was 2012 with 2; the latest was 2022.
Background: where mosquitoes never stop; how the dates are worked out.