Mosquito season in Mohave County, AZ: when it starts and ends

Mosquito months in Mohave County

In a normal year mosquito season in Mohave County, AZ starts around April 30 and ends around October 23, about 25 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Mohave County, and when

• Start tipping out standing water weekly by April 16.
• Book any yard treatment for late April, ahead of the July peak.
• Repellent can go away after October 23.
• 4 West Nile cases since 2016 (last 2023): you should use repellent at dusk June to August, more so if over 60.

Mohave County against the rest of AZ

Mohave County has the 12th longest season of 15 AZ counties, at 176 days against 364 in Maricopa County and 150 in Coconino County. Its mean temperature is 55.9°F.

• Yavapai County: April 13 to October 31 (201 days, 7 WNV)
• Greenlee County: April 21 to October 28 (190 days, 0 WNV)
• Navajo County: May 1 to October 20 (172 days, 7 WNV)
• Apache County: May 7 to October 17 (163 days, 4 WNV)

West Nile in Mohave County

From 1999 to 2025, CDC ArboNET counted 18 human West Nile cases in Mohave County (12 neuroinvasive) across 10 years. The worst was 2004 with 5; the latest was 2023.

See how the dates are worked out, and reading the West Nile counts.