Saipan has no recorded local dengue. Bring repellent for the trails anyway.

Are there mosquitoes in Saipan? Yes, including one of the two mosquito species that spread dengue, but the Northern Mariana Islands have no recorded local dengue. The few cases on record were travelers who caught it elsewhere, and there is no malaria. A daytime repellent habit for trails and WWII sites covers most trips to Saipan, Tinian and Rota.

Imported cases, no local spread on record

CDC's page for the islands lists dengue, but they aren't on CDC's global dengue list and have no CDC travel notice. CDC's 2023 review of dengue in US territories rates the risk as sporadic or uncertain and notes that the islands reported no locally acquired cases from 2010 to 2020.

The cases that do turn up come in with travelers. In August 2019, while Palau had an outbreak, the Commonwealth Healthcare Corporation (CHCC), the islands' health agency, confirmed two dengue cases, at least one of them in a traveler back from Palau. CHCC said there was no evidence of spread on the island, the Saipan Tribune reported. The World Health Organization's Pacific surveillance shows a single report of dengue-like illness from the islands in early 2025 and none in 2026 through early October.

CHCC said in 2019 that one of the two mosquito species that spread dengue is present in the islands. That one bites by day, with peaks after sunrise and in the late afternoon. Saipan has frequent flights to Guam, Palau and Asia, and imported cases come along those routes, so check for outbreaks in the places you're connecting through. CDC lists the islands among areas with mosquitoes that can spread Zika but no reported Zika cases, and for those areas it advises pregnant travelers to prevent mosquito bites during and after travel. CDC also lists leptospirosis, which isn't spread by insects. Avoid floodwater and wading in fresh water or mud.

Where the bites are

Saipan's west-coast resort strip around Garapan tends to be light on bites, and an air-conditioned or screened room helps at night. Shaded jungle trails and WWII sites, in northern Saipan and on Tinian and Rota, are likelier places to meet the day-biter. Put repellent on over sunscreen before you head out, and again after swimming at Managaha or diving the Grotto. Our dengue & Zika routine has the full schedule.

When to go

The drier months, roughly January to May, tend to be the easier stretch. The wet season runs roughly July to November, and mosquitoes tend to be most numerous then. In 2019, CHCC reported many mosquitoes in its traps after heavy rains. Dengue risk stays low in any month. An outbreak in a place with frequent flights to Saipan would raise it, so if Guam or Palau is reporting one, keep the daytime routine strict.

Where you're going

How Saipan's main stops and the neighboring islands compare across the year.

Adding Guam to the trip? Our Guam briefing covers its 2019 outbreak and the southern waterfall hikes.

What travelers report

Paraphrased from TripAdvisor and linked so you can read them in full. Neither is dated, and the forum thread is an old one.

• Mandi Asian Spa, Saipan

  A visitor got a couple of mosquito bites while checking in and advised wearing repellent on the way in, but had no mosquito trouble once in the pool. TripAdvisor ↗

• Saipan

  A long-time resident answering visitors' questions said mosquitoes are present but are less of a problem than in semi-rural parts of the US mainland east of the Mississippi. This is an old thread. TripAdvisor ↗

One rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell them you were in the Northern Mariana Islands, along with any stops in Guam, Palau or Asia. That matters most in the two weeks after you get home, and more so if the fever comes with headache, rash or body aches.

Traveler questions