Mosquito season in Rio Arriba County, NM: when it starts and ends
Mosquito months in Rio Arriba County
In a normal year mosquito season in Rio Arriba County, NM starts around May 28 and ends around September 26, about 17 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Rio Arriba County, and when
- Start tipping out standing water weekly by May 14.
- Book any yard treatment for late May, ahead of the July peak.
- Repellent can go away after September 26.
- 6 West Nile cases since 2016 (last 2023): you should use repellent at dusk July, more so if over 60.
Rio Arriba County against the rest of NM
Rio Arriba County has the 32nd longest season of 33 NM counties, at 121 days against 268 in Doña Ana County and 114 in Catron County. Its mean temperature is 44.7°F.
- Taos County: May 18 to October 3 (138 days, 14 WNV)
- Cibola County: May 20 to October 4 (137 days, 1 WNV)
- Catron County: June 7 to September 29 (114 days, 0 WNV)
West Nile in Rio Arriba County
From 1999 to 2025, CDC ArboNET counted 34 human West Nile cases in Rio Arriba County (18 neuroinvasive) across 9 years. The worst was 2003 with 21; the latest was 2023.
More: how the dates are worked out · reading the West Nile counts.