Mosquito season in Tulare County, CA: when it starts and ends
Mosquito months in Tulare County
In a normal year mosquito season in Tulare County, CA starts around February 23 and ends around November 28, about 40 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Tulare County, and when
- Start tipping out standing water weekly by February 9.
- Book any yard treatment for late February, ahead of the July peak.
- Repellent can go away after November 28.
- 125 West Nile cases since 2016: you should wear EPA-registered repellent at dusk June to September, and check CA spray notices.
Tulare County against the rest of CA
Tulare County has the 29th longest season of 58 CA counties, at 278 days against 365 in Los Angeles County and 110 in Mono County. Its mean temperature is 61.5°F.
- Ventura County: February 17 to December 1 (287 days, 13 WNV)
- Shasta County: February 20 to November 28 (280 days, 16 WNV)
- Napa County: February 24 to November 27 (276 days, 1 WNV)
- Yuba County: February 27 to November 28 (274 days, 24 WNV)
West Nile in Tulare County
From 1999 to 2025, CDC ArboNET counted 278 human West Nile cases in Tulare County (194 neuroinvasive) across 22 years. The worst was 2005 with 56; the latest was 2025.
See how the dates are worked out, and reading the West Nile counts.