Pesticide and herbicide spraying in your community

The City currently applies some herbicides to control dandelions and other broad leaf weeds. We have established thresholds to determine when to conduct treatments, based on type of site and frequency of use. All sites are assessed prior to treatment to ensure the number of weeds exceed our thresholds.

We apply herbicides more often to sport fields, as they have a high use and too many broad leaf weeds can cause safety issues for users and threaten the health of the turf. For other areas, we apply at a lower frequency, as they have a higher tolerance for weeds.

The City takes the health and well-being of citizens and green spaces seriously, so all herbicides and pesticides are carefully chosen and applied to be the least toxic to off-target plants and animals. Furthermore, all pesticides and herbicides are fully certified by both the federal and provincial governments.

Notification and application signs will be posted in the community before, during and after any necessary applications. Herbicide is not applied within 10 metres of a playground unless the entire area is closed to the public and school sites do not receive applications while students are in attendance. There are also a variety of pesticide-free parks in Calgary. 

We also use some alternative weed management techniques, including using goats to manage Canada thistle and different methods of dandelion control. We continue to explore new techniques throughout the year.

NOTE: applications are weather dependent and may not take place as scheduled.

Herbicide Notification for the week of September 15, 2025
Community - Notable Park - Site Specific Location Community Code Quadrant Description of Work
Haskayne HSN NW Legislated Weed Control
Nose Hill NPK NW Legislated Weed Control
Royal Vista  RYV NW Non Selective-Hard Surfaces
Bridgeland BRD NE Legislated Weed Control
Cranston CRA SE Broadleaf, Legislated Weed Control
Douglasdale DDG SE Shrub Bed Weed Control
Inglewood ING SE Legislated Weed Control
Mahogany MAH SE Shrub Bed Weed Control
Manchester Industrial MNI SE Shrub Bed, Hard Surface Weed Control
Maple Ridge MPL SE Broadleaf Weed Control
McKenzie Lake MCK SE Shrub Bed Weed Control
Parkland PKL SE Non Selective-Planting Site
Riverbend RIV SE Shrub Bed Weed Control
Seton SET SE Shrub Bed Weed Control
Walden WAL SE Shrub Bed Weed Control
Belmont BLM SW Shrub Bed Weed Control
Discovery Ridge DIS SW Hard Surfaces, Legislated Weed Control
Glenmore Park GPK SW Legislated Weed Control
Signal Hill SIG SW Hard Surfaces, Legislated Weed Control
Somerset SOM SW Shrub Bed Weed Control
Springbank Hill SPH SW Legislated Weed Control
Yorkville YKV SW Legislated Weed Control
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