Drifting Snow on Rural Driveways and Private Roads: Why It Happens and How to Manage It

Why does a driveway drift shut after it has been plowed?

Because the wind keeps moving snow long after it stops falling. Tabler's guidelines open with a striking point: the quantity of snow that blows onto a road can be hundreds of times greater than the precipitation that falls directly on it. A drive downwind of a large open field is collecting snow from that whole field.

Wind-carried snow travels low. Tabler describes snow moving by creeping, by saltation (particles bouncing along the surface) and by turbulent diffusion, with most saltation in roughly the first 4 inches above the surface and a negligible concentration above about 16 feet. Anything that slows the wind near the ground, such as a plow berm, a ditch, a fence line or a cut bank, makes it drop that load.

When does drifting happen in western Montana?

Mostly with arctic fronts and strong winds behind cold fronts. National Weather Service Missoula forecast discussions from the 2024-25 winter describe east winds of 20 to 30 mph moving toward the Missoula Valley with an arctic front in early February 2025, and in mid-February the possibility that arctic air coming over the Divide would cause localized blowing and drifting snow. In January 2025, behind a Pacific cold front, the office noted that even a little snow could cause more difficulty with a period of blowing and drifting snow.

Arctic snow is dry and light, which is exactly what blows. So the drift risk is often highest with modest snowfall and a hard wind, not with a big wet storm. Our guide to winter storm types in western Montana explains these setups.

Where do drifts form on a driveway or private road?

Where the wind slows down. Tabler's list of contributing causes on roads translates directly to a drive. Drifts form in cut sections, where the road is lower than the ground beside it. A road with insufficient height above grade can end up lower than the surrounding snow cover or the plow berm, so it fills in. A ditch that is too small to hold plowed snow pushes the next drift onto the road. And structures, vegetation and berms along the edge all create still air where snow drops.

On a typical rural property that means the stretch below a bank, the dip where the drive crosses a swale, the gap between two buildings, the downwind side of a hedge or shelterbelt that sits close to the drive, and the last fifty feet at the county road where the plow berm is. If you walk the drive after one windy storm, you will have a map of every drift spot it will have all winter.

How do snow fences work?

A snow fence does not block snow. It slows the wind so the snow drops upwind of the area you want to keep clear. Tabler's guidelines found that fences that are 40 to 50 percent porous store the most snow, and that with a 50 percent porous fence about 85 percent of the trapped snow is deposited on the downwind side. They also recommend leaving a gap under the fence equal to about one tenth of its height, which improves trapping and prevents damage from snow settlement.

The drift behind a fence is long. Tabler describes a drift behind a 50 percent porous fence eventually growing to 30 to 35 times the fence height, and says fences should be placed far enough from the road that the downwind drift does not reach it, normally about 35 times the fence height. For a 4 foot fence that is roughly 140 feet upwind of the drive. A fence set too close simply moves the drift onto the driveway. Fences should also be as long as possible without gaps, because drifts are shorter near the ends, so a fence needs to extend past the stretch it protects.

Do trees and shrubs work as a living snow fence?

They can, and Tabler's guidelines devote a full chapter to living snow fences, including the required height, setback distance and planting patterns. One of their recommendations is planting shrub rows between the road and the tree rows to improve snow control during the years before the trees become fully effective.

The same setback logic applies: a windbreak planted close to a driveway makes the drift land on the drive. If you are planting one, place it well upwind of what you want to protect, choose species suited to your site, and keep fire risk in mind for anything close to buildings. Our landscaping design team can help plan plantings, and our Montana landscaping guide covers what grows here.

How should a drifting driveway be plowed?

With the wind in mind. The worst habit is building tall berms along the windward side of the drive, because a berm is a barrier that creates the next drift right in the lane. Tabler notes that rotary plows, which throw snow rather than push it, minimize plow berm formation. On a residential scale that is one reason a snow blower or a blower attachment works better than a blade on badly drifting stretches.

Push and throw snow to the downwind side where possible, and well back from the edge, so storage space is not used up by mid-season. Widen the drift-prone stretches early in the season so there is room to store later snow without narrowing the lane. Our comparison of plowing or snow blowing goes into which equipment suits which property, and where to pile snow covers storage.

How do I keep a drive findable in blowing snow?

Mark it before the ground freezes. In whiteout conditions the edges of a long drive disappear, and so do culverts, ditches and the turn at the bottom. Tabler's highway guidance calls for delineator posts no farther apart than 200 feet that extend at least 5 feet above the snow cover or plow berm, noting that inadequate delineation contributes to accidents in blowing snow. On a driveway, closer spacing at curves, culverts and drop-offs makes sense.

Our guide to snow stakes and markers covers placement in detail, and snow plow damage prevention covers what to mark so it does not get hit.

Who is responsible for a shared private road that drifts?

Often the people who use it, by agreement, and the answer depends on easements and any road maintenance agreement. We wrote a separate general-information guide on private road snow plowing and who is responsible. It is not legal advice; an attorney is the right person for a dispute.

On the practical side, a shared road with a drift problem benefits from one plan: one contractor, agreed storage areas, markers set once, and repeat passes in wind events. Our private road snow plowing service is set up that way.

Can a drift-prone drive be fixed for good?

Sometimes it can be greatly reduced, though rarely eliminated. The strongest evidence is from highways: Tabler reports a 10-year study on Interstate 80 in Wyoming in which snow fences reduced snow removal expenditures by one-third to one-half. His guidelines cover structural fences, living fences and road design, including how high a road should sit above grade, and he cautions that control measures must be properly engineered to be effective.

Drifts also do damage beyond the inconvenience. Tabler notes that snowdrifts contribute to pavement damage by promoting the infiltration of water under pavement, and that blowing snow can cause slush and ice to form on road surfaces. So a stretch that drifts every storm is often the same stretch that breaks up first in spring. Note where yours are for a season before spending money on them, because one winter of photos after windy storms is the cheapest survey you can do.

When should I call for help with a drifting drive?

Before the season, if you know the drive drifts, so it is on a route with a plan for wind events. During a blow, repeat passes may be needed because the drive fills in as fast as it is opened. Our snow and 24-hour storm services handle continuous snowfall and drifting with repeat visits, and residential snow removal covers routine clearing. For a long road with a serious, recurring drift problem, an engineer or your county road department can advise on fence design or road grade, which is not work we do.

This guide is part of our Montana Winter Property Guide. Call HJ Property Care & Tree Service at (406) 215-7319 or request a free estimate for winter service in Missoula and the Bitterroot Valley.

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