Avalanche in the United States

How dangerous are Avalanche events in the U.S.?

Per event, this hazard is far more dangerous than its frequency suggests. It ranks #38 by how often it is recorded among the 44 hazard types with at least 100 events, but #3 by fatalities per event, at 436.0 deaths per 1,000 recorded events. Recorded damage averages $3.7K per event. A reader scanning total counts would underestimate the risk of encountering one.

Human impact is a defining part of this hazard's NOAA record. Across 344 events, the database lists 150 fatalities and 93 injuries. PlainHazard places hazard types with at least 100 recorded fatalities in its very-high human-toll band. That is a descriptive grouping of this 2015-2025 catalog, not an official NOAA risk grade and not a statement about the severity of every individual event.

Geographic exposure is heavily concentrated in a handful of high-severity states. The three states absorbing the largest share of events are Colorado (72 events, 49 fatalities), Idaho (64 events, 19 fatalities), Wyoming (39 events, 20 fatalities), reflecting both physical geography (coastal exposure, plains corridors, terrain) and dense population sitting directly in harm's way. At the other end, states such as Nebraska, New York, New Hampshire report far fewer events, a genuinely rare event outside the leading states, not merely an underreported one.

Frequency and financial loss occupy a similar place in the NOAA catalog for this hazard. Its #38 event-count rank sits within four positions of its #37 combined-damage rank; the listed losses account for <0.1% of the catalog total. Human impact is a separate comparison: the hazard ranks #16 for fatalities and contributes 1.4% of recorded deaths.

The year-to-year record shows real volatility around a high baseline. The peak year on record was 2023, logging 54 events and $710.5K in property damage in a single calendar year. The most recent year in the dataset is 2025 with 34 events recorded. Across the full 11-year window, annual event counts reflect seasonal climate cycles (ENSO phases, active vs. quiet severe-weather years) and long-term shifts tied to a warming climate both help explain the swings.

NOAA entries are reports filed by local National Weather Service offices. Counts therefore reflect both observed weather and reporting practice; they do not measure unreported events, household exposure, or the probability of a future event at one address.