At 7,350 feet, Mexico City is the easy stop for bites.

Are there mosquitoes in Mexico City? A few, far fewer than on the coasts. At about 7,350 feet (2,240 m), the city has had no confirmed dengue case in 2024, 2025 or 2026 so far, and the CDC rates dengue and Zika risk as minimal because of the altitude. The likeliest bite comes at dusk on the Xochimilco canals.

No confirmed dengue in three years

Mexico's health ministry counted no confirmed dengue cases in Mexico City through October 19, 2026, the lowest rate of Mexico's 32 states, tied with Tlaxcala. It confirmed none in 2025 and none in 2024, a national epidemic year. The ministry does list 151 probable cases for the city in 2026, without saying where they were infected.

The dengue mosquito has reached the city. Aedes aegypti larvae were first found in September 2015, and federal surveillance later found its eggs, mostly in the warmer north and northeast, and recorded the city's first tiger mosquitoes in two national parks, according to published studies. Local spread has not been documented. A 2022 blood survey in four boroughs found dengue antibodies mostly in adults, many of whom had lived in dengue areas, and concluded there is still no local transmission. A 2023–24 survey of 2,569 female mosquitoes caught across the city found no dengue, Zika or chikungunya virus.

Mexico's weekly bulletin reported no chikungunya, Zika, West Nile or malaria in the city in 2025 or 2026 through early October. The CDC recommends no malaria medicine or yellow fever vaccine for Mexico City, and its one Mexico notice, on tick-borne Rocky Mountain spotted fever, covers only the northern border states.

Where the few bites happen

The most common mosquito in five years of federal surveillance in the city was Culex quinquefasciatus, the southern house mosquito, which bites in the evening and at night and breeds in drains and dirty standing water.

Xochimilco is the exception. Its canals, chinampas and the wetlands of the Ecological Park formed the richest mosquito area in that surveillance, mostly Culex, in turbid, saline or polluted water the researchers judged unlikely to hold Aedes larvae. A trajinera ride at dusk is the likeliest place in Mexico City for a few bites, so spray ankles and arms before you board.

December to April is the dry season in the Valley of Mexico, with cool nights, and the low point for mosquitoes. The rains, roughly May or June to September or October, bring more standing water and more night-biting Culex, so keep windows closed or screened at night then. Even so, the city has recorded no confirmed dengue through three rainy seasons.

The day trips are much the same. Teotihuacán is a dry, open site at about 7,500 feet (2,300 m), where a hat, sunscreen and water come before repellent. Estado de México, which holds the pyramids, had 130 confirmed dengue cases by mid-October 2026, almost all in its hot southwestern municipalities. Puebla state had 72, down from 315 at the same point of 2025, clustered in the northern sierra, and the city of Puebla wasn't among the municipalities named.

Where you're going

Scores are for a December–April trip.

If the trip goes on to the coast or the south, the picture changes. The Mexico briefing compares every region, our Oaxaca and Cancún briefings cover two common next stops, and the Chiapas & Calakmul briefing covers the CDC's malaria-medicine area.

What travelers report

Paraphrased from a TripAdvisor forum thread and linked so you can read it in full. It isn't dated, so read it for the pattern rather than for this season.

• Mexico City · February

  Asked about mosquitoes in February, posters said mosquitoes need warm weather and standing water and February usually has neither, that the city rarely has a mosquito problem even in warm weather because of its altitude, and that the problems that do occur trace mostly to standing water. TripAdvisor ↗

One rule outlasts the trip. Any fever during the trip or within two weeks of returning means a doctor visit, and you tell the doctor every region you visited. That detail gets you the right tests quickly.

Traveler questions