Why Every Skier Needs a Real Avalanche Beacon—Not Just a Resort Pass

The Question: Should You Carry Avalanche Gear for In-Bounds Tree Skiing?

Here's a number that should make every skier pause: collisions with trees were the leading cause of ski-area fatalities during the 2024/25 season, accounting for nearly half of all reported deaths (NSAA fatal incident fact sheet). That's not backcountry terrain—that's inside the resort. So the question we're asking is blunt: should you carry a beacon, shovel, and probe for in-bounds tree skiing? Our answer is a qualified yes, and here's why.

The Data: Tree Collisions and Snow Immersion Are Not Backcountry Problems

When we think avalanche gear, we picture wide-open slopes and wind-loaded cornices. But the NSAA's numbers tell a different story. In 2024/25, snow immersion incidents—including tree wells—represented roughly ten percent of ski-area fatalities (NSAA fatal incident fact sheet). Tree wells are deep pockets of loose snow around tree trunks that can completely engulf a skier, often head-down. They're not avalanches, but they kill the same way: burial. And while tree collisions are a separate cause, they share a common factor: losing control in steep, tight terrain. The NSAA also reported that most catastrophic incidents in 2024/25 involved male skiers on more difficult (intermediate) terrain, with speed, loss of control, and collisions with trees as the primary factors (NSAA catastrophic injury fact sheet). That's not a backcountry profile—that's a blue-square skier who wandered into the trees.

The Gear: What We Actually Recommend Carrying

For in-bounds tree skiing, we recommend a minimalist avalanche kit: a digital beacon, a collapsible shovel, and a probe. That's it. No airbag, no ABS pack—just the essentials. Here's the reasoning. If you're buried in a tree well or a small in-bounds avalanche, your partners have minutes, not hours, to find you. A beacon turns a hopeless search into a systematic one. A probe pinpoints your exact location, and a shovel moves snow fast. Without these, a burial becomes a recovery, not a rescue. The key is to practice with your gear before you need it. We're not saying you need to take an avalanche course to ski in-bounds, but you should know how to use your beacon in a mock burial. And we're not saying you should wear this gear on groomers—it's for when you duck into the trees.

Resort Ratings Don't Tell You the Real Danger

Here's the catch: trail ratings are relative to each individual resort, not standardized nationally (Ski trail ratings). A black diamond at one resort might be a blue square at another. And a blue square can still have tree wells, rocks, and cliffs. The NSAA's data shows that most catastrophic incidents happen on intermediate terrain, which is exactly where skiers let their guard down. So the rating system isn't a safety guarantee. It's a difficulty indicator, not a hazard map. When you see a blue square with trees, you're not getting a pass on avalanche danger. You're entering terrain that can kill you, even without an avalanche.

The Cost: What Does a Basic Kit Run You?

We get it: ski gear is expensive. But a basic beacon, shovel, and probe from a reputable brand will set you back around $300–$400 total. That's less than a day of lessons or a season pass upgrade. And you can often find used gear at ski swaps. The alternative is a friend digging with their hands while you suffocate. The math is simple. And here's a concrete scenario: you're skiing a blue-square tree run at a resort like Sun Valley, which opened in December 1936 and pioneered the world's first chairlift (Sun Valley history). You fall, slide into a tree well, and your partner sees you disappear. With a beacon, they can locate you in minutes. Without it, they're guessing. The difference is life or death.

Comparison: In-Bounds Tree Skiing vs. Backcountry Skiing

Let's put this in perspective. In the backcountry, the danger is avalanches, and the risk is managed with education, forecasts, and gear. In-bounds, the danger is trees and snow immersion, and the risk is often ignored. Here's a comparison table:

The irony is stark. In the backcountry, where avalanches are a known risk, we carry gear. In-bounds, where tree wells and collisions kill more people, we often don't. That's a gap we need to close.

What About Avalanche Danger Ratings?

You might think that checking the avalanche forecast is enough. But the North American Public Avalanche Danger Scale has five levels, from Low to Extreme, and at Considerable danger, natural avalanches are possible and human-triggered avalanches are likely (Avalanche danger scale). That's a high risk, and it applies to backcountry terrain, not necessarily in-bounds. However, some in-bounds terrain can slide, especially after heavy snow. Parks Canada strongly recommends that the general public avoid areas where the avalanche danger rating is HIGH or EXTREME, and that any travel in these areas be restricted to simple terrain or kept within ski resort boundaries (Avalanche danger scale (Parks Canada)). That last phrase—'kept within ski resort boundaries'—implies that resorts are a safe haven. But they're not, especially if you're skiing trees under a HIGH or EXTREME rating. The resorts do their best to mitigate, but they can't control every tree well. So check the forecast, but don't assume it's a free pass.

Takeaway: Carry the Gear, But Don't Stop There

We're not saying you need to be a gear-head to enjoy a blue square. But if you ski trees, even in-bounds, you should carry a beacon, shovel, and probe. The stats are clear: tree collisions and snow immersion are the top killers in U.S. ski areas, and they happen on terrain most skiers consider safe. This isn't about fear-mongering; it's about being prepared. So next time you duck into the trees, take the gear. It might just save your life—or your partner's.

Sources

• NSAA fatal incident fact sheet - https://nsaa.org/webdocs/Media_Public/IndustryStats/fatality_fact_sheet_2025.pdf
• NSAA catastrophic injury fact sheet - https://nsaa.org/webdocs/Media_Public/IndustryStats/catastrophic_injury_fact_sheet_2025.pdf
• Ski trail ratings - https://nsaa.org (NSAA ski slope difficulty signage)
• Sun Valley history - https://www.sunvalley.com/explore/90-season/
• Avalanche danger scale - https://avalanche.org
• Avalanche danger scale (Parks Canada) - https://www.parks.canada.ca/pn-np/mtn/securiteenmontagne-mountainsafety/avalanche/echellerisque-dangerscale