Mosquito season in Grant County, NM: when it starts and ends
Mosquito months in Grant County
In a normal year mosquito season in Grant County, NM starts around April 6 and ends around November 4, about 30 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Grant County, and when
- Start tipping out standing water weekly by March 23.
- Book any yard treatment for early April, ahead of the July peak.
- Repellent can go away after November 4.
- No West Nile cases since 2016, so bites in Grant County are a nuisance; check window screens.
Grant County against the rest of NM
Grant County has the 12th longest season of 33 NM counties, at 212 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 57.6°F.
- De Baca County: April 3 to November 3 (214 days, 0 WNV)
- Quay County: April 4 to November 4 (214 days, 6 WNV)
- Guadalupe County: April 4 to November 1 (211 days, 1 WNV)
- Roosevelt County: April 7 to November 1 (208 days, 3 WNV)
West Nile in Grant County
From 1999 to 2025, CDC ArboNET counted 3 human West Nile cases in Grant County (2 neuroinvasive) across 3 years. The worst was 2014 with 1; the latest was 2014.
More: how the dates are worked out · when the season starts across the US.