The Los Cabos municipal government will send fumigation trucks through residential neighborhoods in Cabo San Lucas starting July 6 as part of a two-week campaign to combat mosquitoes that carry dengue, Zika, and chikungunya.
Municipal Health Coordinator Adán Monroy Justo announced the campaign on July 2. Spraying in Cabo San Lucas will run from July 6 to 10 and again from July 13 to 22, covering multiple colonias across the city. San José del Cabo will follow on a separate two-week schedule that has not yet been published.
What Residents Should Do During Spraying
The Municipal Health Institute (Instituto Municipal de Salud) is distributing flyers with neighborhood-by-neighborhood schedules. Residents are asked to open doors and windows when the fumigation trucks pass through so the insecticide can reach indoor areas where mosquitoes rest.
Officials are also urging residents to eliminate standing water from buckets, planters, old tires, and pet dishes. Tinacos (rooftop water storage tanks) should be kept tightly covered. These are the primary breeding sites for Aedes aegypti mosquitoes, the species responsible for transmitting all three targeted diseases.
Rainy Season Brings Peak Mosquito Risk
The campaign coincides with the start of Baja California Sur’s summer rainy season, which typically runs from July through October. Short, intense bursts of rain create pools of standing water that can produce a new generation of mosquitoes in as little as seven days. Los Cabos recorded a high number of dengue cases in 2024, which prompted authorities to accelerate prevention efforts.
The fumigation drive complements a newer strategy already underway in the municipality. Since August 2025, state health authorities have been releasing Aedes aegypti mosquitoes carrying Wolbachia, a naturally occurring bacteria that blocks the insects’ ability to transmit dengue and other viruses. The Wolbachia program entered its second phase in December 2025, with targeted releases in specific neighborhoods across Los Cabos.
How to Check Your Neighborhood’s Schedule
Specific dates and colonias for each round of spraying are listed on official flyers from the Municipal Health Institute. Residents can look for these at local health offices or on the Los Cabos municipal government’s website and social media channels. The San José del Cabo schedule will be announced separately once the Cabo San Lucas phase is complete.
The campaign is a joint effort between the Los Cabos city government and the Baja California Sur State Health Secretariat (Secretaría de Salud), as first reported by the municipal government at loscabos.gob.mx.