Snow Plowing Trigger Depth: When to Start Plowing

Trigger depth is the snow accumulation level at which you begin plowing. It is the most important term in your snow removal contract because it determines how often you go out, how much you get paid, and your liability exposure. Get it wrong and you either leave money on the table or annoy customers with unnecessary service.

Standard Trigger Depths

How Trigger Depth Affects Your Revenue

A lower trigger depth means more plowable events per season. More events means more revenue (per-push pricing) or the same revenue for more work (seasonal pricing).

Setting the Right Trigger for Your Market

Residential customers:

Most residential customers expect service at 2-3 inches. Below 2 inches, many homeowners consider it a dusting they can handle themselves. A 2-inch trigger is the sweet spot — it captures most meaningful snowfalls without triggering service for light dustings that melt by noon.

Commercial customers:

Commercial properties almost always use a 1-2 inch trigger. Property managers are focused on liability — if someone slips on an un-cleared parking lot, the property owner (and by extension, the snow contractor) faces a lawsuit. A 1-inch trigger provides maximum liability protection.

Premium residential:

Wealthy homeowners and HOA communities often want a 1-inch trigger. They are paying premium prices ($55-85 per visit) and expect pristine conditions. Market this as a premium service tier.

Trigger Depth in Contracts

Your contract must specify trigger depth clearly. Vague language leads to disputes.

Good contract language:

• "Snow removal services shall begin when snowfall accumulation reaches 2 inches as measured at the service location."
• "Trigger depth: 2 inches. Accumulation measured on flat, open surfaces at the property."
• "Service will be initiated when accumulation reaches the trigger depth, whether during or after the storm event."

Bad contract language:

• "We will plow when it snows" — no defined trigger, constant disputes
• "Service as needed" — who decides what is needed?
• "When accumulation is significant" — significant to whom?

During-Storm vs. After-Storm Service

During-storm service on commercial lots:

If a storm drops 10 inches over 8 hours, a commercial lot with a 2-inch trigger may require 3-4 plowing visits during the storm to keep the lot passable, plus a final cleanup. Each visit is billable. A single 10-inch storm can generate $1,500-4,000 in revenue from one commercial lot.

Measuring Snow Depth

Disputes about "how much snow actually fell" are common. Protect yourself:

• Use a snow measurement board: A 2x2 ft white board placed on a flat surface at the property. Check it before service to document actual accumulation.
• Check official weather stations: NWS and local weather stations report snowfall totals. Reference these in disputes.
• Timestamp your service: GPS logs and timestamped photos prove when you arrived, how much snow was present, and what condition you left the property in.
• Contract clause: "In the event of a dispute regarding accumulation, the snowfall total reported by [nearest NWS station] shall be the binding measurement."

Common Mistakes

• Different triggers, same price: A 1-inch trigger customer gets twice as many visits as a 3-inch trigger customer. If both pay $40/push, the 1-inch customer is getting twice the service. Price accordingly — lower triggers should mean higher per-push rates or lower seasonal contract rates per event.
• No trigger in the contract: Without a defined trigger, customers call you at 1 inch one week and refuse to pay at 3 inches the next. Define it in writing before the season.
• Ignoring ice-only events: Freezing rain, ice storms, and refreezing events often fall below your snow trigger but still require de-icing service. Your contract should address ice events separately from snow events.
• Not adjusting triggers by service type: Plowing trigger and salting trigger should be different. Salting may be needed at any accumulation or temperature (below 32°F + moisture), while plowing only triggers at 2+ inches.