Avalanche Danger Isn't a Weather Forecast: Read It Like a Pro

Imagine this: You've just clicked out of your skis at the top of a pristine Colorado bowl. The snow looks perfect, the sun is out, and you've got a fresh line all to yourself. But you remember the avalanche forecast this morning: it said "Considerable" danger above treeline. You pause. Is that safe? Does "Considerable" mean you should turn around, or just be careful? If you're like most skiers, you probably don't have a clear answer. And that's exactly the problem.

Here's the thing: avalanche danger ratings aren't a weather forecast. They're a risk-assessment tool, and most of us read them wrong. We treat a rating like "Considerable" as a mild warning, when in fact it's the deadliest rating on the scale. I've seen it happen too many times—skiers who would never dream of skiing during "High" danger happily duck into avalanche terrain on a "Considerable" day, not realizing that they're statistically more likely to die that day than on a "High" day. Let's bust some myths and get you home safe.

What does the avalanche danger scale actually tell me?

The North American Public Avalanche Danger Scale has five levels: Low, Moderate, Considerable, High, and Extreme (avalanche.org). But here's the kicker: the danger doesn't increase linearly—it increases exponentially between levels (avalanche.org). That means the jump from Moderate to Considerable is bigger than the jump from Low to Moderate, and the jump from Considerable to High is even bigger still. Most people think of these ratings as a 1-to-5 scale, but they're more like a 1, 2, 4, 8, 16 scale. At Considerable, natural avalanches are possible and human-triggered avalanches are likely (avalanche.org). That's not a gentle warning—that's a red flag.

Is it safe to ski in-bounds during a HIGH danger day?

This is a question I get all the time, and the answer might surprise you: it depends on what "in-bounds" means. Parks Canada strongly recommends that the general public avoid areas where the avalanche danger is HIGH or EXTREME, and that any travel in these areas be restricted to simple terrain or kept within ski resort boundaries (Parks Canada). That last part is key—ski resort boundaries. Resorts actively mitigate avalanche risk by bombing slopes and closing dangerous terrain. So if you're skiing on open, patrolled runs inside a resort, you're generally safe, because the resort has done the work to reduce the danger. But if you're thinking about ducking a rope or heading out the gate into sidecountry, you're on your own. At High danger, travel in avalanche terrain is not recommended (avalanche.org). So, in-bounds on open runs? Fine. Out-of-bounds? Absolutely not.

Why is "Considerable" more dangerous than "High" for skiers?

This is the myth that gets people killed. Look at the stats: U.S. avalanche fatalities have stayed relatively stable at about 25 to 30 per year since 1995, despite backcountry use skyrocketing (avalanche.org). But here's the thing—most of those deaths happen on days rated Considerable, not High. Why? Because on High days, nobody goes out. The danger is obvious, so people stay home. But on Considerable days, the danger is subtle. You might see a forecast that says Considerable, and think, "Well, it's not High, so it's probably fine if I'm careful." And that's exactly when you get caught. Avalanche danger increases exponentially, so Considerable is not "halfway" to High—it's already a serious threat. If you're planning to ski avalanche terrain on a Considerable day, you need to be a professional-grade decision maker, not just a competent skier.

Is it true that avalanches only happen in the backcountry?

No, and this is a dangerous misconception. Avalanches can happen anywhere there's enough snow and slope angle, including inside ski resort boundaries. That's why resorts spend millions on avalanche control. But the stats show that the vast majority of avalanche fatalities occur in the backcountry, not at ski areas. In the 2024/25 season, NSAA reported 50 skier and snowboarder fatalities at U.S. ski areas, but those were mostly collisions with trees, not avalanches (NSAA fatal incident fact sheet). In fact, snow immersion incidents, including tree wells, represented about ten percent of those deaths (NSAA fatal incident fact sheet). So while avalanches are rare in-bounds, tree wells are a real risk. If you're skiing in deep snow near trees, you're not safe just because you're in-bounds—you need to stay with your group and be aware of the hazard.

Do helmets really make a difference, or is it just a false sense of security?

Let's settle this once and for all: yes, helmets absolutely make a difference. The numbers are clear. Helmet use among U.S. skiers and snowboarders grew from 25 percent in the 2002/03 season to 90 percent in the 2023/24 season (NSAA helmet safety). And a 2010 meta-analysis of 12 studies found that helmeted skiers and snowboarders were significantly less likely to sustain a head injury, with a pooled odds ratio of 0.65 (CMAJ 2010). That's a 35% reduction in head injury risk. For kids under 13, the protection is even stronger—they were 59% less likely to suffer a head injury (CMAJ 2010). And no, helmets don't increase neck injury risk—the same meta-analysis found no evidence of that (odds ratio 0.89) (CMAJ 2010). So if you're not wearing a helmet, you're making a bad bet. The only excuse left is vanity, and that's just stupid.

Quick tip: When you're skiing in-bounds on a bluebird day after a storm, don't let the resort's grooming fool you. The danger ratings still apply to the backcountry, but in-bounds, the biggest risk is often a collision with a tree. So keep your speed in check and stay in control.

What should I do if I'm caught in an avalanche?

This is the question everyone hopes they never have to answer, but you should know what to do. First, try to get off the slab—swim, roll, anything to stay on top. If you get buried, your best chance is to create an air pocket with your hand in front of your face, then stay calm and conserve oxygen. But the real key is rescue: your partners need to find you fast. That's why you should always carry a beacon, shovel, and probe, and know how to use them. Since 1989, all avalanche beacons transmit on the international frequency of 457 kHz (ICAR), so your beacon will work with anyone else's. But remember: the best way to survive an avalanche is to not get caught in one. Check the forecast, take an avalanche course, and make conservative decisions.

Bottom line

The single best move you can make this season is to treat the avalanche danger scale like the exponential scale it is, and when it says Considerable or higher, stay out of avalanche terrain unless you have the training and experience to make your own informed decisions. Check the forecast at avalanche.org before every backcountry trip, and remember: in-bounds, the resort does the thinking for you. Out-of-bounds, you're the forecaster. Don't be the skier who thinks "Considerable" is a green light—because it's often the deadliest rating of all.

Sources

• Avalanche danger scale - https://avalanche.org
• Avalanche danger scale (Parks Canada) - https://www.parks.canada.ca/pn-np/mtn/securiteenmontagne-mountainsafety/avalanche/echellerisque-dangerscale
• Avalanche fatality trends (WEM/USDA) - http://avalanche.org/wp-content/uploads/2018/07/17_WEM_Birkeland_etal_AvFatalities.pdf
• NSAA fatal incident fact sheet - https://nsaa.org/webdocs/Media_Public/IndustryStats/fatality_fact_sheet_2025.pdf
• NSAA helmet safety - https://www.nsaa.org/NSAA/Safety/Helmet_Safety/NSAA/Safety/Helmet_Safety.aspx?hkey=1e6c9416-77ce-4e62-97ee-8364565e9bfe
• Helmet meta-analysis (CMAJ 2010) - https://pubmed.ncbi.nlm.nih.gov/20123800/