What Trigger Depth Means in a Snow Contract

Almost every argument between a property manager and a snow contractor traces back to one unwritten number.

The trigger depth is the snow accumulation that automatically puts a crew on your property. Below it, nobody comes. At or above it, service starts — without a phone call from you, without a negotiation, without anybody checking whether it "seems bad enough."

It sounds simple. It goes wrong constantly, because in a lot of contracts it isn't actually defined.

Why the trigger has to be in writing

Say your contract says "snow removal as needed." Two inches fall overnight. You expect a plow. The contractor doesn't send one, because in their head "as needed" meant three inches and they were busy at a property that got six.

Nobody lied. There was just never a number.

A real trigger clause answers four questions:

1. What depth starts service? The number.
2. Where is it measured? On your property — not at the airport, not at the contractor's yard, not "in the metro."
3. What starts at that depth? Plowing? Walks? De-icing? These don't have to fire together, and often shouldn't.
4. What happens during a long storm? Does the crew come back once accumulation adds another trigger's worth on top of what it already cleared?

Get those four answered and most of the fight disappears.

Where it gets measured actually matters here

This is a bigger deal in Colorado than almost anywhere else, and it is not a technicality.

Seasonal snowfall varies enormously across short distances on the Front Range, because terrain drives it. Compare the NOAA 1991–2020 climate normals, station to station:

Station	Annual snowfall normal
Denver–Central Park	49 inches
Wheat Ridge	75.5 inches
Boulder	89.7 inches

NOAA 1991–2020 normals. Boulder's figure is a Sep–Jun snow-year total.

Wheat Ridge is about eight miles from the Denver–Central Park gauge, and it averages roughly half again as much snow. Boulder averages nearly double.

So "Denver got an inch" is a meaningless statement in a contract dispute. Your Wheat Ridge property and your Central Park property did not have the same storm. The trigger has to name a measurement point on the site, and someone has to actually read it.

The three trigger structures

A fixed trigger. One accumulation number starts the service. It's the most common arrangement in commercial work, it's easy to administer, and everybody knows where they stand.

Zero tolerance. The lot and the walks are kept clear continuously through the event — the crew works the property while it's still snowing rather than waiting for a threshold. Hospitals, urgent care, senior living, 24-hour manufacturing, and anywhere a fall is catastrophic tend to land here. It costs meaningfully more, because it is meaningfully more work. A contractor who quotes zero tolerance at a fixed-trigger price is a contractor who has not thought about what they just agreed to.

A split trigger. A lower trigger on walks, entries, and ramps than on the open lot. This one is underused and it is usually the right answer. The walk is where people fall and where a municipal clearing deadline may already be running against you; the back forty stalls of the lot can hold a little longer. Buying continuous coverage on the whole property when you only need it on the concrete is how you overpay.

Then there's the pricing structure — a separate question

People conflate the trigger with the pricing model. They're independent. You can run any of these structures with any trigger.

Per-push

You pay each time the crew services the property. The trigger decides when that happens.

• Good for: properties where you want cost to track actual work, and budgets that can flex.
• Watch for: what constitutes a separate "push" in a long storm. If a twelve-hour event gets serviced three times, is that one push or three? The contract should say. This is the single most common per-push dispute.
• The structural tension: the contractor makes more money the more they come out. Not sinister — just worth knowing which way the incentive points.

Per-inch (tiered)

Price scales with accumulation, usually in bands. A small event costs less than a big one.

• Good for: fairness. Everyone agrees a two-inch storm is less work than a fourteen-inch storm.
• Watch for: how the measurement gets made and by whom, since now the depth determines the invoice, not just whether anyone shows up. Both sides need to agree on the source of truth in advance.

Seasonal (fixed)

You pay a flat seasonal price — often billed monthly across the season — regardless of how many storms come.

• Good for: budget certainty. You know the number in September and it doesn't move. Most institutional property managers want this, and it's why they want it.
• The structural tension: it flips the incentive. A light winter is a windfall for the contractor; a brutal one is a loss. In a heavy season, a seasonal contractor is the one being squeezed — so make sure the scope is airtight, because that's where a squeezed contractor looks for room.
• Watch for: caps. Some seasonal contracts include an event cap or a snowfall cap above which extra charges kick in. That's not automatically unfair, but you need to know it's there in September, not in February.

There's no universally correct answer. Seasonal buys certainty and costs you the light winters. Per-push buys fairness and costs you your budget predictability. Pick the one whose failure mode you can live with.

What to actually ask before you sign

• What's my trigger, in inches, and where on my property is it measured?
• Do walks and entries have a different trigger than the lot?
• In a storm that runs twelve hours, how many times do you come, and how is that billed?
• What's not included? Ice events with no accumulation? Drifting after the storm ends? Refreeze the next morning?
• Is de-icing inside the trigger price or separate?
• If it's seasonal — is there a cap, and what happens above it?
• What record do I get of each visit, and when do I get it?

That last one is the one nobody asks, and it's the one that matters when a claim lands eighteen months later. Here's why.

The short version

• The trigger is the accumulation that starts service automatically. It belongs in writing, with a measurement point on your property.
• Front Range snowfall varies enormously across short distances — a metro-wide number is not your number.
• A split trigger — lower on walks than on the lot — is usually the smart structure, because the walk is where the exposure is.
• Per-push, per-inch, and seasonal aren't better or worse; they move risk between you and the contractor. Know which direction it's moving.

If you want the trigger, the scope, and the pile locations written down before the season turns, send us the property and we'll walk it.