When winter arrives in Northern Ontario, one of the most common questions homeowners ask is when their snow contractor will arrive after a snowfall. Understanding snowfall triggers helps you set clear expectations for driveway availability and prevents morning commute surprises.
If you are researching seasonal agreements, evaluating local trigger depths is just as essential as understanding how much snow removal costs in Greater Sudbury in 2026. Here is how professional snow clearing triggers operate across Sudbury.
What Is a Snow Trigger?
A snow trigger is the minimum depth of accumulated snowfall required before a professional snow removal company automatically dispatches equipment to clear your driveway.
How Trigger Measurement Works
Contractors monitor weather stations and local snowfall accumulation throughout Greater Sudbury. When total fallen snow reaches the contracted depth on flat ground, dispatch begins automatically.
Measured on open, flat surfaces
Excludes wind drifts or snowbanks
Common Trigger Depths
Different service levels use different snowfall thresholds. Here is how standard options compare:
Ultra Sensitive
2.5 cm Trigger
~ 1 Inch
Dispatches for light dustings. Great for mobility challenges, but results in frequent visits that drive up contract fees.
Pros: Driveway stays completely bare
Industry Standard
5 cm Trigger
~ 2 Inches
The ideal balance for northern winters. Clears snow before vehicles get stuck while keeping seasonal rates fair.
Pros: Best value and reliability
Heavy Snow Only
7.5 cm Trigger
~ 3 Inches
Dispatches only after significant snowfall. Lower contract cost, but light snow packs down into slippery ice under car tires.
