How to Save Ski Season

February 2015 was the snowiest month in Boston’s history. Over 28 days, the city received a debilitating 64.8 inches of snow; plows ran around the clock, eventually covering a distance equivalent to “almost 12 trips around the Equator.” Much of that plowed snow ended up in the city’s Seaport District, piled into a massive 75-foot-tall mountain that didn’t melt until July.

The Seaport District slush pile was one of 11 such “snow farms” established around Boston that winter, a cutesy term for a place that is essentially a dumpsite for snow plows. But though Bostonians reviled the pile — “Our nightmare is finally over!” the Massachusetts governor tweeted once it melted, an event that occasioned multiple headlines — the science behind snow farming might be the key to the continuation of the Winter Olympics in a warming world.

The number of cities capable of hosting the Winter Games is shrinking due to climate change. Of 93 currently viable host locations, only 52 will still have reliable winter conditions by the 2050s, researchers found back in 2024. In fact, over the 70 years since Cortina d’Ampezzo first hosted the Olympic Games in 1956, February temperatures in the Dolomites have warmed by 6.4 degrees Fahrenheit, according to Climate Central, a nonprofit climate research and communications group. Italian organizers are expected to produce more than 3 million cubic yards of artificial snow this year to make up for Mother Nature’s shortfall.

But just a few miles down the road from Bormio — the Olympic venue for the men’s Alpine skiing events as well as the debut of ski mountaineering next week — is the satellite venue of Santa Caterina di Valfurva, which hasn’t struggled nearly as much this year when it comes to usable snow. That’s because it is one of several European ski areas that have begun using snow farming to their advantage.

Like Ruka in Finland and Saas-Fee in Switzerland, Santa Caterina plows its snow each spring into what is essentially a more intentional version of the Great Boston Snow Pile. Using patented tarps and siding created by a Finnish company called Snow Secure, the facilities cover the snow … and then wait. As spring turns to summer, the pile shrinks, not because it’s melting but because it’s becoming denser, reducing the air between the individual snowflakes. In combination with the pile’s reduced surface area, this makes the snow cold and insulated enough that not even a sunny day will cause significant melt-off. (Neil DeGrasse Tyson once likened the phenomenon to trying to cook an entire potato with a lighter; successfully raising the inner temperature of a dense snowball, much less a gigantic snow pile, requires more heat.)

Shockingly little snow melts during storage. Snow Secure reports a melt rate of 8% to 20% on piles that can be 50,000 cubic meters in size, or the equivalent of about 20 Olympic swimming pools. When autumn eventually returns, ski areas can uncover their piles of farmed snow and spread it across a desired slope or trail using snowcats, specialized groomers that break up and evenly distribute the surface. For Santa Caterina, the goal was to store enough to make a nearly 2-mile-long cross-country trail — no need to wait for the first significant snowfall of the season, which creeps later and later every year.

“In many places, November used to be more like a winter month,” Antti Lauslahti, the CEO of Snow Secure, told me. “Now it’s more like a late-autumn month; it’s quite warm and unpredictable. Having that extra few weeks is significant. When you cannot open by Thanksgiving or Christmas, you can lose 20% to 30% of the annual turnover.”

Though the concept of snow farming is not new — Lauslahti told me the idea stems from the Finnish tradition of storing snow over the summer beneath wood chips, once a cheap byproduct of the local logging industry — the company's polystyrene mat technology, which helps to reduce summer melt, is. Now that the technique is patented, Snow Secure has begun expanding into North America with a small team. The venture could prove lucrative: Researchers expect that by the end of the century, as many as 80% of the downhill ski areas in the U.S. will be forced to wait until after Christmas to open, potentially resulting in economic losses of up to $2 billion.

While there have been a few early adopters of snow farming in Wisconsin, Utah, and Idaho, the number of ski areas in the United States using the technique remains surprisingly low, especially given its many other upsides. In the States, the most common snow management system is the creation of artificial snow, which is typically water- and energy-intensive. Snow farming not only avoids those costs — which can also have large environmental tolls, particularly in the water-strapped West — but the super-dense snow farming produces is “really ideal” for something like the Race Centre at Canada’s Sun Peaks Resort, where top athletes train. Downhill racers “want that packed, harder, faster snow,” Christina Antoniak, the area’s director of brand and communications, told me of the success of the inaugural season of snow farming at Sun Peaks. “That’s exactly what stored snow produced for that facility.”

The returns are greatest for small ski areas, which are also the most vulnerable to climate change. While the technology is an investment — Antoniak ballparked that Sun Peaks spent around $185,000 on Snow Secure’s siding — the money goes further at a smaller park. At somewhere like Park City Mountain in Utah, stored snow would cover only a small portion of the area’s 140 miles of skiable routes. But it can make a major difference for an area down the road like the Soldier Hollow Nordic Center, which has a more modest 20 miles of cross-country trails.

In fact, the 2025-2026 winter season will be the Nordic Center’s first using Snow Secure’s technology. Luke Bodensteiner, the area’s general manager and chief of sport, told me that alpine ski areas are “all very curious to see how our project goes. There is a lot of attention on what we do, and if it works out satisfactorily, we might see them move into it.”

Ensuring a reliable start to the ski season is no small thing for a local economy; jobs and travel plans rely on an area being open when it says it will be. But for the Soldier Hollow Nordic Center, the stakes are even higher: The area is one of the planned host venues of the 2034 Salt Lake City Winter Games. “Based on historical weather patterns, our goal is to be able to make all the snow that we need for the entire Olympic trail system in two weeks,” Bodensteiner said, adding, “We envision having four or five of these snow piles around the venue in the summer before the Olympic Games, just to guarantee — in a worst case scenario — that we’ve got snow on the venue.”

Antoniak, at Canada’s Sun Peaks, also told me that their area has been a bit of a “guinea pig” when it comes to snow farming. “A lot of ski areas have had their eyes on Sun Peaks and how [snow farming is] working here,” she told me. “And we’re happy to have those conversations with them, because this is something that gives the entire industry some more resiliency.”

Of course, the physics behind snow farming has a downside, too. The same science saving winter sports is also why that giant, dirty pile of plowed snow outside your building isn’t going anywhere anytime soon.