Mosquito season in Inyo County, CA: when it starts and ends
Mosquito months in Inyo County
In a normal year mosquito season in Inyo County, CA starts around March 31 and ends around November 12, about 32 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Inyo County, and when
- Start tipping out standing water weekly by March 17.
- Book any yard treatment for late March, ahead of the July peak.
- Repellent can go away after November 12.
- 4 West Nile cases since 2016 (last 2017): you should use repellent at dusk June to September, more so if over 60.
Inyo County against the rest of CA
Inyo County has the 42nd longest season of 58 CA counties, at 226 days against 365 in Los Angeles County and 110 in Mono County. Its mean temperature is 59.9°F.
- Lake County: March 14 to November 17 (247 days, 10 WNV)
- San Diego County: March 14 to November 14 (245 days, 36 WNV)
- Humboldt County: March 27 to November 7 (225 days, 1 WNV)
- Placer County: April 3 to November 10 (221 days, 35 WNV)
West Nile in Inyo County
From 1999 to 2025, CDC ArboNET counted 4 human West Nile cases in Inyo County (1 neuroinvasive) across 1 year. The worst was 2017 with 4; the latest was 2017.
More: how the dates are worked out · reading the West Nile counts.