Mosquito season in Lea County, NM: when it starts and ends
Mosquito months in Lea County
In a normal year mosquito season in Lea County, NM starts around March 10 and ends around November 23, about 37 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Lea County, and when
- Start tipping out standing water weekly by February 24.
- Book any yard treatment for early March, ahead of the July peak.
- Repellent can go away after November 23.
- 6 West Nile cases since 2016 (last 2025): you should use repellent at dusk May to September, more so if over 60.
Lea County against the rest of NM
Lea County has the 4th longest season of 33 NM counties, at 258 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 62.7°F.
- Sierra County: March 1 to November 20 (264 days, 0 WNV)
- Eddy County: March 5 to November 18 (258 days, 5 WNV)
- Hidalgo County: March 11 to November 18 (252 days, 0 WNV)
- Luna County: March 16 to November 13 (242 days, 5 WNV)
West Nile in Lea County
From 1999 to 2025, CDC ArboNET counted 26 human West Nile cases in Lea County (17 neuroinvasive) across 11 years. The worst was 2013 with 5; the latest was 2025.
More: how the dates are worked out · reading the West Nile counts.