Vermont winter field guide

What Does a 2-Inch Plowing Trigger Really Mean?

How accumulation triggers, timing, drifting, mixed precipitation, and long storms affect service.

Burlington Snow & IceReviewed for practical scope

Short answer

A snowfall trigger is the accumulation depth at which a plowing visit happens: commonly 2–3 inches for residential properties and 1–2 inches for commercial ones. It is the single most consequential number in a snow agreement, because on a per-push structure it decides how many visits get billed across a winter, and on a seasonal structure it decides how much service you are entitled to. Get the number in writing. Ask specifically what happens on a storm that stalls just below the trigger and then resumes hours later: some agreements treat that as one event and others as two, and that distinction alone can change how many visits a marginal winter actually bills.

Why the trigger is the number that matters

Every other price in a snow agreement is a rate; the trigger is what those rates get multiplied by. On a per-push structure, a two-inch trigger produces materially more billed visits across a Champlain Valley winter than a three-inch trigger on the same snowfall, because more events cross the lower line. On a seasonal structure the effect inverts: a lower trigger raises the fixed price, because the contractor is committing to more visits. Either way, two quotes with identical unit rates but different triggers are not the same deal, and the cheaper-looking one is often the one that will bill or cost more.

This is also why a commercial trigger sits below a residential one. A business admitting the public onto its surfaces carries a duty of care, so it clears sooner, at 1–2 inches or on a zero-tolerance basis. A home clears when the drive stops being comfortably driveable, commonly 2–3 inches. The right trigger is a judgement about consequence and cost, not a default to copy.

The details around the number

Where the depth is measured decides whether the trigger is honest. Two inches at a regional airport station is not two inches on your shaded driveway, and a scope should say the measurement is taken on the property or specify the reference. Then there is the long storm: an event that drops eight inches over eighteen hours needs an opening pass partway through to keep the property usable, then a cleanup pass, and whether the agreement counts that as one visit or two is a real difference in a heavy winter. Finally the near-miss: an event that stops at 1.8 inches under a two-inch trigger, then glazes overnight, is exactly the situation an accumulation-only trigger has no instruction for. So ice-control triggers get written by condition, not by depth.

Keep reading

Related winter guides
Guide	Covers
Why Freeze–Thaw Weather Creates So Much Ice	How sun, shade, roof runoff, banks, and nighttime temperatures turn meltwater into recurring hazards.
What Snow Plowing Costs in Greater Burlington	A practical guide to the factors behind per-push, per-event, and seasonal snow pricing.
Seasonal Contract vs. Per-Push Plowing	How to compare predictability, storm risk, scope, and service expectations before signing.

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Straight answers

Questions to settle before the snow flies

What is a snowfall trigger?

It is the number that, multiplied by the rates, largely determines what a winter costs, so it is the most consequential figure in a snow agreement.

What is a normal residential trigger?

Around 2–3 inches. Below that, most drives are comfortably passable and a visit is not billed. The right number depends on the property and the household. A steep drive or one used by an early commuter may justify a lower trigger than a flat suburban one.

Why is a commercial trigger lower?

The lower trigger means more billed events across a winter, which is why the trigger, not the unit rate, sets a commercial property’s real winter cost.

Where is the snow depth measured?

A trigger measured somewhere else is a trigger you cannot verify, and it is worth pinning down before signing.

What happens in a long storm?

Whether the agreement counts that as one visit or two is a real difference in a heavy winter, and the scope should define it. Leaving it to interpretation invites a dispute.

What if it snows just under the trigger?

That is the gap an accumulation-only trigger does not cover: an event that stops at 1.8 inches under a two-inch trigger and then glazes overnight leaves an untreated hazard. Ice-control gets triggered by condition instead of depth for that reason, and a plowing trigger alone is an incomplete plan.

Can I set my own trigger?

Yes, within reason, and it is worth thinking about. Accepting a default is not the same as choosing one. A lower trigger costs more but keeps the surface cleaner; a higher one saves money but tolerates more accumulation. Match it to how you use the property and what a slippery morning would cost you.

What is a zero-tolerance trigger?

Not a depth at all: continuous service through an event instead of after a threshold, priced by the hour or the event. It suits sites that cannot tolerate any accumulation, like hospital entrances, and it is expensive. Choose it deliberately; do not write it in casually.

Does a lower trigger mean a safer property?

A cleaner one, more often, but not a safe one. A lower trigger removes accumulation sooner; it does not prevent refreeze, freezing rain, or meltwater glazing a just-cleared surface. Trigger sets how often snow is removed, not whether the surface is ever hazard-free.

Should walkways have the same trigger as the driveway?

Usually a lower one. Two inches on a driveway is a minor nuisance; two inches on a step compacts to ice under the first few footfalls and stays. Properties with foot traffic commonly run the pedestrian trigger below the vehicle trigger, stated separately in the scope.

How many times will my trigger be hit in a winter?

That depends on the trigger and the winter. A lower trigger in a snowier part of the valley is hit far more often than a higher one on the lake floor. Building three sample winters against your chosen trigger is the way to see the range before committing to per-push or seasonal.

Is the trigger a guarantee of when I’ll be serviced?

No. It is the condition that authorises a visit, not a promised arrival time. During a regional event every property on a route triggers at once, road conditions slow every vehicle, and properties are cleared in route order. The trigger says when service is due, not when it arrives.