Mosquito season in Greenlee County, AZ: when it starts and ends
Mosquito months in Greenlee County
In a normal year mosquito season in Greenlee County, AZ starts around April 21 and ends around October 28, about 27 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Greenlee County, and when
- Start tipping out standing water weekly by April 7.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 28.
- No West Nile cases since 2016, so bites in Greenlee County are a nuisance; check window screens.
Greenlee County against the rest of AZ
Greenlee County has the 11th longest season of 15 AZ counties, at 190 days against 364 in Maricopa County and 150 in Coconino County. Its mean temperature is 54.6°F.
- Cochise County: March 27 to November 13 (231 days, 4 WNV)
- Yavapai County: April 13 to October 31 (201 days, 7 WNV)
- Mohave County: April 30 to October 23 (176 days, 4 WNV)
- Navajo County: May 1 to October 20 (172 days, 7 WNV)
West Nile in Greenlee County
From 1999 to 2025, CDC ArboNET counted 1 human West Nile case in Greenlee County (1 neuroinvasive) across 1 year. The worst was 2013 with 1; the latest was 2013.
Background: when mosquitoes go away for the winter; how the dates are worked out.