Mosquito Spray Schedules

Here’s where to find out when spraying for adult mosquitoes is scheduled around Boulder County. Ads also appear in local newspapers. You can request your property not be sprayed for adult mosquitoes, and you can also request notification by phone before spraying occurs. We encourage you to get on the no-spray list even if you live so close to your neighbors that it’s a symbolic gesture.

City of Boulder residents: The City of Boulder has in years past managed to avoid large-scale spraying for adult mosquitoes, although the city could spray under certain conditions. Ottertail Environmental provides Boulder’s mosquito management. Click here, then follow links to get to Ottertail’s adult-mosquito spray schedules and a no-spray and notification request form.

Residents of Longmont, Erie, Lafayette, Louisville, Superior, and unincorporated Boulder County. Colorado Mosquito Control provides mosquito control for these areas. Click here for spray schedules, and scroll down for a shutoff/no-spray and call-notification request form.

Notification of City of Boulder Pesticide Applications

To find out where the City of Boulder will be applying pesticides—before you show up at the park or the trailhead—click on City of Boulder Pesticide Applications or call the City of Boulder pesticide hotline at 303-441-3400.

City of Boulder Pesticide Notification Ordinance

The City of Boulder has an ordinance laying out requirements for notifying neighbors of pesticide applications. It does contain loopholes, however. Notably, it does not require notification ahead of time for pesticide applications to lawns, and it requires no notification at all of spot treatments, which could include typical applications of Roundup and related herbicides. The following information is available online:

• Notification Requirements for Outdoor Pesticide Applications lays out the basic requirements of the city’s ordinance.
• The complete ordinance is also available.

Citizens for Pesticide Reform has submitted detailed suggestions to the city for tightening up the ordinance. However, the proposal is currently on the back burner.

The State Pesticide Sensitive Registry

If a physician can document that you’ve already become sensitive to pesticide exposure, you can apply to be on the state’s Pesticide Sensitive Registry. For more information and a link to the application form, click here. According to the state:

The registry does not prevent application of pesticides but only requires that commercial applicators (like lawn care companies) notify people on the registry 24 hours before an application is made to abutting property (property that touches yours) so that you can leave for a period of time or make other preparations for the application.