Mosquito season in Apache County, AZ: when it starts and ends
Mosquito months in Apache County
In a normal year mosquito season in Apache County, AZ starts around May 7 and ends around October 17, about 23 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Apache County, and when
- Start tipping out standing water weekly by April 23.
- Book any yard treatment for early May, ahead of the July peak.
- Repellent can go away after October 17.
- 4 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to August, more so if over 60.
Apache County against the rest of AZ
Apache County has the 14th longest season of 15 AZ counties, at 163 days against 364 in Maricopa County and 150 in Coconino County. Its mean temperature is 52.2°F.
- Mohave County: April 30 to October 23 (176 days, 4 WNV)
- Navajo County: May 1 to October 20 (172 days, 7 WNV)
- Coconino County: May 15 to October 12 (150 days, 0 WNV)
West Nile in Apache County
From 1999 to 2025, CDC ArboNET counted 16 human West Nile cases in Apache County (12 neuroinvasive) across 12 years. The worst was 2004 with 5; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.