Mosquito season in Kalawao County, HI: when it starts and ends

Mosquito months in Kalawao County

Mosquitoes in Kalawao County, HI can be active in any month. The worst stretch is January to December.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Kalawao County, and when

• No off-season here: tip out standing water every week, all year.
• A yard treatment matters most January to December.
• No West Nile cases since 2016, so bites in Kalawao County are a nuisance; check window screens.

Kalawao County against the rest of HI

Kalawao County has the 2nd longest season of 5 HI counties, at 365 days against 365 in Honolulu County and 272 in Hawaii County. Its mean temperature is 75.5°F.

• Honolulu County: all year (365 days, 1 WNV)
• Kauai County: all year (365 days, 0 WNV)
• Maui County: all year (365 days, 0 WNV)

West Nile in Kalawao County

CDC ArboNET lists no human West Nile cases for Kalawao County from 1999 to 2025.

See how the dates are worked out, and where mosquitoes never stop.