Toronto lawns need 1 to 1.5 inches of water per week, delivered as 2 to 3 deep waterings between 5 and 9 am — not daily light sprinkling. Full GTA seasonal schedule and watering bylaw rules.
Toronto lawns need approximately 1 inch of water per week from all sources combined — rainfall plus irrigation. One inch equals about 25 mm, or roughly 18 to 20 minutes of run time for a standard oscillating sprinkler on a typical residential lot. Use the tuna-can test: place 3 empty cans across your lawn and measure how long your sprinkler takes to fill them to 1 inch. That run time is your weekly target.
No — evening watering is the single biggest cause of lawn fungus in the GTA. When grass blades stay wet for 8 or more hours overnight, fungal pathogens including dollar spot, brown patch, red thread, and pythium thrive. If you absolutely must water in the evening, do it before 6 pm so leaves dry by sunset. The optimal window is mid-morning (8 to 10 am) after dew has dried.
Almost certainly not. Cool-season grasses go dormant in extended heat and drought as a survival mechanism. The crowns stay alive 4 to 6 weeks without water. As long as you avoid walking on dormant lawn, which crushes crowns, the lawn will green back up within 14 days of consistent rain or watering. Many GTA homeowners let their lawn go dormant in July intentionally to save water.
Yes — south and west-facing lawns lose 20 to 30 percent more water to evaporation than shaded north-facing lawns. Increase those zones by one extra session per week in July and August. Heavily shaded areas often need less watering than the standard 1-inch rule suggests.