What are the odds of dying in an avalanche?
Evidence quality 4.5/5
Eight-dimension review score against the quality rubric . Each dimension scored 1–5.
- D1 Source grounding
- 5/5
- D2 Source authority
- 5/5
- D3 Arithmetic
- 5/5
- D4 Uncertainty
- 4/5
- D5 Scope
- 4/5
- D6 Prose
- 5/5
- D7 Perception honesty
- 3/5
- D8 Caveat completeness
- 5/5
Lifetime probability · lifetime, US adult
1 in 210,526
0.0005% lifetime chance
Most people overestimate this.
range 1 in 769,231 to 1 in 111,111
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≈ As likely as
Perceived
Avalanche fear is sharply bimodal. Most Americans live nowhere near avalanche terrain and give it no thought at all. Among backcountry skiers, snowmobilers, and mountaineers, however, avalanche anxiety is pervasive and often well-calibrated — participants routinely check avalanche forecasts, carry beacons, and take courses. Media coverage of avalanche fatalities tends to spike around dramatic multi-burial incidents, reinforcing the sense that backcountry winter travel is inherently deadly, even as the per-trip risk for trained users remains low.
Rough estimate: Backcountry users often guess ~1 in 1,000 to 1 in 10,000 per season
Source: editorial intuition, not polled
Actual
~27 deaths per winter season in the US (10-year average)
US residents, all ages, including non-participants in avalanche-terrain activities
Show derivation
CAIC reports an average of 27 avalanche deaths per winter in the US over the last 10 seasons. Annual rate: 27 / 335,000,000 ≈ 8.06 × 10⁻⁸. Compounded over 59 remaining adult years: 1 − (1 − 8.06 × 10⁻⁸)⁵⁹ ≈ 4.75 × 10⁻⁶ ≈ 1 in 210,000. This is a population-level figure that dilutes the risk across the vast majority of Americans who never enter avalanche terrain. For active backcountry recreationists, the per-participant risk is orders of magnitude higher.
Caveats: The population-level figure of 1 in 210,000 is almost comically misleading as a …
The population-level figure of 1 in 210,000 is almost comically misleading as a personal risk estimate, because the denominator includes roughly 300 million Americans who never set foot in avalanche terrain. The relevant risk population is backcountry winter recreationists — estimated at 3–5 million participants in the US — for whom the per-participant annual risk is on the order of 1 in 100,000 to 1 in 200,000 per season, and higher still for those who spend many days in consequential terrain. Snowmobilers and backcountry skiers account for the majority of fatalities. Peitzsch et al. documented a demographic shift toward older victims (30–49), likely reflecting both increased participation by that cohort and the possibility that experience breeds overconfidence. Avalanche risk is also strikingly geographic: Colorado, Alaska, Utah, Montana, and Washington account for the vast majority of US fatalities.
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Other risks with roughly the same likelihood — useful for calibration.
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The Colorado Avalanche Information Center, which maintains the database of record for US avalanche fatalities, reports an average of 27 deaths per winter over the last ten seasons. Spread across the entire US population, that works out to roughly 1 in 210,000 over an adult lifetime — a number so low it barely registers against everyday hazards like car crashes (1 in ~93) or even lightning (1 in ~1.2 million). But population-level figures are almost meaningless here, because the denominator includes hundreds of millions of people who will never enter avalanche terrain.
For the 3–5 million Americans who ski, snowboard, snowmobile, or climb in the backcountry each winter, the per-participant risk is orders of magnitude higher. A rough estimate puts the annual risk for an active backcountry recreationist at somewhere between 1 in 100,000 and 1 in 200,000 per season — low enough that any single outing is quite safe, but high enough that a lifetime of regular backcountry travel accumulates nontrivial exposure. Avalanche education, beacon use, and terrain selection substantially modify this figure, though quantifying the effect of training on individual risk is notoriously difficult.
Peitzsch et al. (2019) documented 1,084 avalanche fatalities in the US from 1950 through 2018 and found a striking demographic shift: the age groups 30–49 now account for a growing share of victims, displacing the younger cohort that once dominated the statistics. The researchers suggest that increased backcountry participation by older, more affluent recreationists — along with improved equipment that enables deeper penetration into consequential terrain — explains the trend better than any change in avalanche frequency. Better gear, in other words, may expand exposure faster than it reduces per-exposure risk.
Geography concentrates the hazard further. Colorado, Alaska, Utah, Montana, and Washington account for the large majority of US avalanche fatalities. Within those states, a small number of terrain features and aspects generate a disproportionate share of incidents. The national average is a useful accounting identity; it is not a forecast for anyone who actually makes decisions about where to ski.
Claim ledger
Every number below is what each source reported, with the verbatim quote we relied on and how we arrived at our figure. Click any link to verify directly.
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[1] Colorado Avalanche Information Center (CAIC) — Statistics and Reporting
Statistics and Reporting- Statistic
Average of 27 avalanche deaths per winter in the US over the last 10 seasons; over 1,000 fatalities since 1950- Excerpt
“"Over the last 10 winters, an average of 27 people died in avalanches each winter in the United States." ”
- Source data from
- 2025-09-30
- Accessed
- 2026-04-12 · archived copy
- Calculation
- CAIC maintains the database of record for US avalanche fatalities. The 10-year average of 27 deaths per winter is the central estimate. The range over the past decade spans roughly 15 to 37 deaths per season, which drives the uncertainty band. Annual population-level rate: 27 / 335 × 10⁶ ≈ 8.06 × 10⁻⁸. Lifetime over 59 adult years: 1 − (1 − 8.06 × 10⁻⁸)⁵⁹ ≈ 4.75 × 10⁻⁶. Low bound uses ~15 deaths/yr; high bound uses ~37 deaths/yr plus upward trend in backcountry participation.
- Independence
- CAIC compiles fatality data from search-and-rescue reports, coroner records, and media accounts. Their database is the primary source cited by avalanche.org and by academic researchers; there is no fully independent parallel US avalanche fatality database.
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[2] Journal of Outdoor Recreation and Tourism — How old are the people who die in avalanches? A demographic analysis of avalanche fatalities in the United States, 1950–2018
How old are the people who die in avalanches? A demographic analysis of avalanche fatalities in the United States, 1950–2018- Statistic
1,084 avalanche fatalities in the US from 1950–51 through 2017–18; victim demographics shifting toward older age groups- Excerpt
“"Between 1950–51 and 2017–18, 1,084 people were killed in avalanches in the United States. The age groups where fatalities are increasing are the ages of 30 to 39 and 40 to 49." ”
- Source data from
- 2019-10-01
- Accessed
- 2026-04-12 · archived copy
- Calculation
- Peitzsch et al. analyzed 68 years of CAIC data and documented 1,084 fatalities. Over that span the annual average was roughly 16, reflecting lower backcountry participation in earlier decades. The upward trend to ~27/yr in recent decades tracks increased backcountry recreation participation rather than increased avalanche frequency. This paper provides the demographic granularity; the CAIC 10-year average provides the more current central estimate for normalization.
- Independence
- Peitzsch et al. used the same CAIC database but applied independent demographic and trend analysis. The paper was peer-reviewed and published in a recreation-research journal, providing an academic check on the raw CAIC counts.