On June 25, 2024, the City of Longmont announced that this season of mosquito spraying would begin on June 27, based on a positive West Nile mosquito pool detected in Larimer County. Additional testing has determined that this test was a false positive. As a result, Longmont’s spray threshold has not been met, and no spraying will occur the week of June 27.

The City of Longmont contracts with Vector Disease Control International (VDCI) to spray local neighborhoods in Longmont to control the spread of West Nile Virus. Spraying is triggered – per predetermined spray area – when traps in that area exceed 150 mosquitoes per trap AND when West Nile Virus positive mosquitoes are discovered in Larimer, Boulder or Weld Counties.

When the triggering events occur, notice is provided on the West Nile Virus webpage on Tuesdays that spraying will occur later that week – typically on Thursday evenings – giving residents 48 hours’ notice of any spraying.

Receive Notifications Related to West Nile Virus

VDCI maintains a database of Longmont residents who have made notification or shutoff requests for their property if spraying is scheduled. Please contact VDCI to request notification, shutoff, or both by filling out the form at the bottom of the page at vdci.net/colorado or by calling 877-276-4306.

Boulder County Public Health and Longmont officials urge residents to take necessary precautions this holiday weekend to protect themselves. Keep safe, remember the 4Ds:

• Use DEET-enhanced insect repellent or alternative
• DRESS in light colors and loose-fitting long sleeves and pants
• Avoid the outdoors from DUSK until DAWN
• DRAIN standing water outside your home

Learn more about West Nile Virus, the City’s integrated pest management program and how to protect yourself from West Nile Virus on the City’s West Nile Virus webpage or by calling 303-651-8416.