Mosquito season in Yavapai County, AZ: when it starts and ends
Mosquito months in Yavapai County
In a normal year mosquito season in Yavapai County, AZ starts around April 13 and ends around October 31, about 29 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Yavapai County, and when
- Start tipping out standing water weekly by March 30.
- Book any yard treatment for mid April, ahead of the July peak.
- Repellent can go away after October 31.
- 7 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.
Yavapai County against the rest of AZ
Yavapai County has the 10th longest season of 15 AZ counties, at 201 days against 364 in Maricopa County and 150 in Coconino County. Its mean temperature is 56.2°F.
- Graham County: March 13 to November 16 (248 days, 6 WNV)
- Cochise County: March 27 to November 13 (231 days, 4 WNV)
- Greenlee County: April 21 to October 28 (190 days, 0 WNV)
- Mohave County: April 30 to October 23 (176 days, 4 WNV)
West Nile in Yavapai County
From 1999 to 2025, CDC ArboNET counted 13 human West Nile cases in Yavapai County (8 neuroinvasive) across 10 years. The worst was 2021 with 3; the latest was 2023.
More: how the dates are worked out · reading the West Nile counts.