Every spring in Calgary, homeowners who winterized their irrigation system properly now face the reverse question: when is it safe to turn the sprinklers back on? Getting this timing right protects the system from a late-season frost and ensures your lawn gets water when it truly needs it.
Calgary Spring Sprinkler Startup — Safe Timing Guide
| Condition | Startup Status | Risk Level |
|---|---|---|
| Before May 1 (Calgary average) | Too early — still frost risk in late April | High — late frost could freeze pressurized lines |
| May 1-15 (average safe window) | Recommended — nighttime temps reliably above -2°C | Low — J.G. Irrigation books most startups here |
| May 15-31 (late start) | Safe — very low frost risk; lawn needs water by now | Very low |
| Overnight low forecast below -4°C | Delay startup — turn off main if pressurized already | High if system is full of water |
J.G. Irrigation begins booking Calgary spring startups in March and is typically fully booked through May by mid-April. A professional startup ($75-$120) includes turning on the system slowly to prevent water hammer, testing all zones, inspecting heads for winter damage, and programming the controller for the new season. Call 587-433-4795 to book your 2026 spring startup early.
Calgary spring irrigation startup — Book for May 2027 Now
J.G. Irrigation — Calgary Irrigation Services
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