Are there mosquitoes on Kauai? Light in Poipu, heavy on the Kalalau Trail.

Yes, mostly on the north shore and its trails. The day-biting Asian tiger mosquito lives islandwide and bites hardest in the wet, shaded north, from Hanalei to the Kalalau Trail, while sunny Poipu stays light. No vaccine or medicine is needed, and our Hawaii briefing covers the other islands.

Dengue on Kauai

Hawaii's Department of Health says it currently sees dengue only in travelers who caught it elsewhere. Kauai gets an occasional case, most recently in April 2026, according to press reports, and all of this year's cases statewide involved travel to Pacific islands. CDC's provisional weekly tables listed 9 dengue cases reported by Hawaii through mid-October 2026, none of them severe.

Kauai's last local spread was small. In the 2001–02 outbreak, 4 of the 122 laboratory-positive local infections were on Kauai, a 2005 study in Emerging Infectious Diseases found. The first Kauai patient had shared accommodations with someone who fell ill after returning from Tahiti, which points to an introduction separate from Maui's. The tiger mosquito is still established here, and those surveys found no Aedes aegypti on Kauai.

So the routine matters even with no local cases. The tiger mosquito bites in daylight, with peaks in the morning and late afternoon, so repellent goes on before trails and garden walks. If a fever starts during or after the trip, see a doctor and mention where you traveled, including any Pacific islands before Hawaii. Our dengue routine has the daily schedule.

North shore trails, south shore beaches

Poipu and the south shore tend to be light, and an evening coat of repellent usually covers a resort stay. The wetter north shore has more mosquitoes. Hanalei's sand tends to be breezy, while gardens, taro-field edges and the town at dusk are likelier places to get bitten.

The trails are where visitors meet them. On the Na Pali coast, forum posters describe bites on the legs of hikers in shorts on the way to Hanakapiai Falls, even with repellent, and a muddy, buggy campsite at Hanakoa, about 6 miles in, with mosquitoes worst around dusk and after rain. Put repellent on before you start, wear light long pants or reapply on your legs, and plan to be off the trail before dusk. An early start also keeps you clear of stream crossings, which can flood after rain.

Waimea Canyon and Kokee are higher and cooler, and mud is the usual trail complaint. At about 3,600 feet (1,100 m), Kokee sits below the elevation where Hawaii's Culex mosquitoes thin out, so keep a small bottle in the pack. Don't drink, swim in or wade through stream water with cuts or scrapes. State health advice, as reported in local media, warns of leptospirosis in fresh water, and repellent does nothing for that one.

Season matters mostly on the north shore. It is wettest from roughly November to March, when the Kalalau Trail is muddiest and mosquitoes are busiest after rain, and summer tends to be drier there. Poipu is sunny in any month, and Kokee is cool all year.

Where you're going

How the main stops compare, in any month.

Comparing islands? Our Maui briefing covers the Road to Hana, Maui's own wet rainforest drive, and its quiet leeward resorts.

What travelers report

Paraphrased from TripAdvisor threads and reviews and linked so you can read them in full. None is dated, and rain and which side of the island you're on change the picture from one day to the next.

• Kauai

  A visitor asked what was biting them. Replies blamed tiny biters they could not see; some posters suspected sand flies, and others disputed that. TripAdvisor ↗

• Kalalau Trail, Na Pali coast

  The reviewer enjoyed the views on the first 2 miles of the trail but found it muddy, with lots of mosquitoes. TripAdvisor ↗

• Awaawapuhi-Nualolo loop, Kokee State Park

  Reviewing the long Awaawapuhi-Nualolo loop above Waimea Canyon, the hiker called it epic and said their group encountered no insects. TripAdvisor ↗

One rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell them you were on Kauai, and anywhere else you went.

Traveler questions