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Mosquito-borne illnesses are spread to people by the bite of an infected mosquito. Examples include West Nile virus (WNV) or Eastern equine encephalitis (EEE) virus. Typically, the season for West Nile virus or other mosquito-borne illnesses in Boston is summer through early fall.

The Boston Public Health Commission (BPHC) partners with the Suffolk County Mosquito Control Project (SCMCP) to protect Boston residents from mosquito-borne disease transmission. The SCMCP collects mosquito samples (known as mosquito "pools") in traps every week during the summer and early fall. These traps are located throughout the city. The samples are tested at the Hinton State Laboratory to determine if WNV or EEE virus is present.

Information from mosquito pools, including the number of mosquitoes present, helps to determine where extra precautions are needed to keep Boston residents safe. This may include truck mounted aerosol spraying to control adult mosquito populations.

If mosquito spraying is required, it will be completed between dusk and 11:30 PM on scheduled days in targeted areas of the City (see below). Mosquito spraying is subject to weather and may need to be rescheduled. SCMCP advises that if people see a spray truck approaching, they should go indoors for a few minutes. Residents are also advised to close any windows that face the street during scheduled spraying. Information on the larvicide is available at

Process to Exclude Property from Mosquito Control and other Public Area Wide Pesticide Application
Residents can file to have their property excluded from spraying at any time of the year.  Filing to exclude a person's property can be done electronically through the Massachusetts Department of Agricultural Resources (MDAR- or by sending an exclusion form through the mail to MDAR.  Questions regarding the exclusion process can be answered by calling Juan Carlos Gutierrez at the MDAR at 617-626-1723 or by emailing

For more information about spraying and other mosquito control activities, contact the Suffolk County Mosquito Control Project at
(781) 899-5730.

Scheduled Mosquito Spraying in Boston

(Updated: February 27, 2018)

Mosquito spraying is scheduled as needed during the summer and early fall. Mosquito spraying is subject to weather and may need to be rescheduled. Changes to scheduled spraying will be posted here.

Scheduled Date​Neighborhood​Location
February 28, 2018Hyde Park

Flood plain areas of Fowl Meadow 

​February 28, 2018​West Roxbury​Wetlands areas adjacent to the Sawmill Brook in the vicinity of Gethsemane Cemetery

Follow us on Twitter, like us on Facebook, or read our blog for additional updates on mosquito control in Boston.

​2018 Positive Mosquito Pool Results in Boston*

(Updated: February 27, 2018)

Collection Date​Neighborhood​Mosquito Species​Disease


*A mosquito pool is a sample of many mosquitoes removed from a mosquito trap. Traps are located throughout the City of Boston. Pools are tested during the summer and early fall for West Nile virus (WNV) and Eastern equine encephalitis (EEE).

​2018 Mosquito-borne Illnesses Reported in Boston

(Updated: February 27, 2018)

No human cases of WNV or EEE reported to date in Boston in 2018.

Additional Resources:

Boston Public Health Commission
1010 Massachusetts Ave, 6th Floor, Boston, MA 02118.
Phone:(617) 534-5395 Email: