A Low-Snow Winter in Western Montana: What It Means for Trees, Lawns and Pipes

Is a low-snow winter likely in western Montana this year?

The odds lean that way, but nothing is guaranteed. The Climate Prediction Center's ENSO discussion issued 8 October 2026 had an El Nino Advisory in effect and said El Nino continued to strengthen, with a strong to very strong El Nino likely through January to March 2027 (greater than an 83 percent chance). The same discussion gave a 70 percent chance of a historic-strength event for November to January.

CPC's long-lead outlook discussion issued 15 October 2026 said anticipated El Nino impacts primarily informed the forecast. For November through January it favored above-normal temperatures across the northern tier, with the highest odds from the Pacific Northwest to the northern Plains, and favored below-normal precipitation for the northern Rockies, a pattern it said stayed generally consistent through winter and spring. These are probabilities that tilt the odds, not a promise of a brown winter. Individual storms still happen in El Nino years, and CPC issues new outlooks as the season goes on, so check the current version.

Why does snow cover matter so much for trees and shrubs?

Because it insulates the soil and keeps moisture in it. University of Minnesota Extension says snow cover and mulch act as insulators and keep soil temperatures higher, and that roots of most trees and shrubs that grow in Minnesota die at temperatures at or below 0 and up to 10 degrees Fahrenheit. Roots are much less cold-hardy than branches. University of Wisconsin-Madison Extension adds that without snow, very cold temperatures can freeze the soil deeper and deeper, potentially damaging plant roots.

In western Montana the risk is a cold snap on bare ground. The Missoula airport averages 6.7 nights a year at or below zero in NOAA's 1991-2020 normals, and an arctic front can deliver several in a row. Snow on the ground buffers those nights. Bare ground does not. The shallow-rooted, the recently planted and the plants in raised beds and containers are most exposed.

Should I water trees during a dry winter?

Often, yes. Colorado State University Extension, writing for a similar dry Rocky Mountain climate, notes that there is often little or no snow cover to provide soil moisture from October through March, and that long dry periods in fall and winter can injure or kill parts of root systems. The damage may not show until plants decline or die the following spring or summer. CSU recommends watering during extended dry periods without snow about once or twice a month.

CSU's timing rules are worth following here too: water only when air and soil temperatures are above 40 degrees with no snow cover, and water at midday so it soaks in before possible freezing at night. Woody plants with shallow roots and newly planted trees and lawns need it most. Our sibling guide to winter watering for trees and shrubs in Montana covers how and how much, and winter burn on evergreens explains the browning a dry, windy winter causes.

Which plants are most at risk in a dry, open winter?

CSU Extension singles out woody plants with shallow root systems, newly planted trees and newly established lawns. In western Montana yards that usually means trees and shrubs planted in the last few years, evergreens on south and west exposures, plants in raised beds and containers (whose roots sit above ground level), and anything in a windy, unshaded spot.

University of Minnesota Extension adds a timing point that matters this fall: if the fall has been dry, water heavily before the ground freezes to reduce frost penetration, and it cautions that watering only in late fall does not help reduce injury. Its schedule is to decrease watering slightly in September, then water thoroughly in October until freeze-up. A layer of mulch over the root zone of young trees and beds does what snow would have done, holding moisture and evening out soil temperature.

What does a low-snow winter do to lawns?

Exposed turf dries out and takes more freeze-thaw stress. CSU Extension notes that lawns in warm exposures are prone to late winter mite damage and that water is the best way to prevent turf injury. South- and west-facing slopes, strips along driveways and lawn next to reflective walls are the first places to look for it.

Wisconsin Extension's point about soil heaving applies to lawn edges and beds as well: fluctuating temperatures without snow lead to freezing and thawing of the upper soil. In spring, look for heaved perennials and pull-back along bed edges. A low-snow winter does not mean you can skip the fall steps in our winter lawn care do's and don'ts, and our lawn care and aeration and overseeding services are the spring fix for thin patches. Snow mold is a separate issue that follows long snow cover; see snow mold and winter kill.

Are pipes and irrigation at more risk without snow?

Anything shallow is. If bare soil freezes deeper, as Wisconsin Extension describes, the lines and fittings closest to the surface are the first to feel it: irrigation backflow assemblies, valve boxes, yard hydrants and hose bibs. The American Red Cross lists outdoor hose bibs, sprinkler lines and pipes in unheated spaces or against uninsulated exterior walls as the pipes that freeze most often.

If your irrigation system was not blown out this fall, it is not too late to ask; see our sprinkler blowout and winterization service and the guide to frozen backflow preventers. For pipes in the house, the Red Cross advice is to keep the thermostat at the same setting day and night during very cold weather and never below 55 degrees when you are away. A plumber handles anything that has already frozen inside.

Does a low-snow winter affect next summer's water?

Yes, through the mountains rather than the valley. NRCS's Montana water supply reports explain that most of the annual streamflow in the western United States originates as snowfall that has accumulated high in the mountains during winter and early spring. What falls on your lawn matters much less than what builds up in the Bitterroot and Sapphire ranges.

Valley and mountain snow can also tell different stories. The NRCS Montana Water Supply Outlook for 1 January 2026 described a tale of two snowpacks: low-elevation SNOTEL stations below 70 percent of median while some higher sites ran near or above normal. NRCS publishes these reports through the winter and spring, with a Bitterroot basin page and streamflow forecasts from March through June. A low-snow winter is a good reason to plan an efficient irrigation season; see watering windows and water-wise irrigation.

Does less snow mean less ice?

Not necessarily. A mild winter that hovers around freezing can produce more refreeze, not less, because every thaw makes meltwater and every cold night turns it to ice. Freezing rain also tends to show up when mild Pacific air arrives over cold valleys. Missoula already averages roughly 130 days a year that freeze at night and thaw by day, and a warmer winter could push more days into that range.

So keep ice management in the plan even if the shovel stays dry. Our guides to black ice on driveways and walks and freeze-thaw cycles explain where it forms and how to stay ahead of it. If you hold a seasonal snow agreement, what happens to snow contracts in a light winter covers that side.

How will I know if the outlook changes?

Three public sources cover it. The Climate Prediction Center's ENSO discussion tracks El Nino and its expected strength. CPC's seasonal outlooks show how the odds for temperature and precipitation shift as the winter goes on. And the NRCS Montana Snow Survey reports what has actually accumulated in the mountains, basin by basin, including the Bitterroot. For the week ahead, the NWS Missoula forecast discussion is the best plain-language explanation of what is coming.

Keep in mind that an outlook is about the season as a whole. A winter that ends up warm and dry overall can still deliver one heavy storm or a week of arctic cold, so keep snow service arranged and pipes protected either way. Our guide to winter storm types in western Montana explains what each kind of storm does.

What should I do on a property this winter if the snow does not come?

Water trees and shrubs on mild, dry days. Mulch perennial beds and young trees once the ground freezes. Check that irrigation, hydrants and hose bibs were drained. Keep an eye on south-facing evergreens and lawn edges. Keep ice treatment on hand for the refreeze days. And use the dry ground: winter is a good time for dormant pruning and tree removal, because frozen, bare ground is easier on lawns and beds than spring mud.

This guide is part of our Montana Winter Property Guide. For the long-term numbers, see how much snow Missoula and the Bitterroot get. Whatever the winter brings, our snow and 24-hour storm services cover clearing, ice management and storm tree work. 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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