The American Alpine Club annually publishes Accidents in American Mountaineering, which contains reports from various mountaineering accidents that occurred that year. The journal also includes statistical tables which summarize the number of mountaineering accidents, injuries, and fatalities, as well as interesting specifics such as terrain, immediate and contributing causes, ages and experience levels of individuals, month of year, type of injury, and location. I was fascinated by these statistical tables, but found the data hard to visualize. So, I spent a day creating pie charts and graphs from the 2007 Statistical Tables, which contain statistics on mountaineering accidents from 1951-2006 (click the above link to see the raw data for the 2007 statistical tables, which were the most recent I could find on the AAC website). The following page gives my graphical output.

The conclusion: For your best chances at experiencing a mountaineering accident, try climbing unroped or above your abilities on rocky terrain sometime between May-Sept in California or Washington.

(Note that a percentage of mountaineering accidents are never reported. Inherent to nearly all statistical data, the "missing data" issue tends to make absolute values a bit too low, but has little effect on percentages or relative comparisons.)

"To reduce the chance of an accident, competent climbers develop a balanced relationship with fear, an awareness of danger, and turn their mental energy into positive means to overcome problems. Both instinct and acquired judgement are developed from experience. One learns about choices, when to push limits, where to avoid stonefall, where to belay, and when to turn back." "Climbing is never wholly predictable, and from this uncertainty a richness may arise. It is important not to diminish the spirit of climbing and eliminate all risk. To reduce all commitment lessens the spirit and engagement of the adventure." -Sage advice from the climbing great Fred Beckey, Fred Beckey's 100 Favorite North American Climbs

---

Mountaineering Accidents, Injuries, Fatalities 1951-2006:

Injuries and Deaths per Accident, 1951-2006

---

Primary Cause	Contributory Cause	Type of Injury
Terrain	Ascent/Descent	Experience Level
Age of Individuals	Month

---

Total Reported Accidents by Location, 1951-2006 Averages - Pie Chart	Fatal Accidents by Location, 1951-2006 Averages, Pie Chart
Total Reported Accidents by Location, per 1,000,000 people in state, 1951-2006 Averages - Pie Chart	Fatal Accidents by Location, per 1,000,000 people in state, 1951-2006 Averages, Pie Chart

Total Reported Accidents by Location, 1951-2009 Data by Decade - Cartograms

	1950s	-->	1960s	-->	1970s	-->
-->	1980s	-->	1990s	-->	2000s

Fatal Accidents by Location, 1951-2009 Data by Decade - Cartograms

	1950s	-->	1960s	-->	1970s	-->
-->	1980s	-->	1990s	-->	2000s

Although not covered in the statistical tables of the American Alpine Journal's Accidents in American Mountaineering, I was interested in how the frequency of mountaineering accidents compares with the frequency of traffic accidents.

I soon discovered that it is difficult to accurately compare climbing and driving. Climbing vs. driving would be most comparable if the number of accidents could be normalized by the hours spent climbing or driving (i.e. total person-hours/year driving and total person-hours/year climbing). However, this sort of hourly data is not readily available or easily estimated (I'd estimate that I spend more time in the mountains than in my car, whereas most climbers probably drive more than climb).

So I tried another normalizing method, which involved multiplying the climbing accidents by a factor which corresponds to the fraction of climbers in the population. Assuming everyone drives, but only 1 in 150 climbs (the Outdoor Industry Association estimates there are 2 million climbers in the US, which has a population of roughly 300,000,000), then multiplying mountaineering accidents by 150 would somewhat control for exposure. Technically, this technique assumes that the typical climber spends about as many hours driving as climbing, which is probably reasonable within a factor of 2. Even when the number of climbing accidents are multiplied by the normalizing factor of 150, the statistics suggest that the act of climbing is actually safer than the act of driving by a significant margin.

My conclusion, with however large a grain of salt you want to season it with: It's more likely a climber will get in an accident driving to or from the climb than on the climb itself.

	Mountaineering	Traffic	Comments
Accidents reported per year	135 (x150 = 20250)	6,339,200	A climber is 313 (=6339200/20250) times more likely to get in a traffic accident than in a climbing accident.
Injuries per year	111 (x150 = 16650)	3,031,800	A climber is 182 (=3031800/16650) times more likely to get injured in a traffic accident than in a climbing accident.
Fatalities per year	28 (x150 = 4200)	42,880	A climber is 10 (=42880/4200) times more likely to die in a traffic accident than in a climbing accident. (Note that this factor considers both accident frequency and fatality rate; hence, even though a climbing accident is more likely to cause a fatality than a traffic accident, because climbing accidents are less frequent, it is still more likely a person would die in traffic than climbing.)
Injuries per accident	0.82	0.48	Although mountaineering accidents are much less frequent than traffic accidents, they are 1.7 times more likely to cause injury than traffic accidents.
Fatalities per accident	0.21	0.01	Although mountaineering accidents are much less frequent than traffic accidents, they are 31 times more likely to cause fatalities than traffic accidents.

(Traffic data from US Census Bureau, Motor Vehicle Accidents and Fatalities, 1990-2006. Mountaineering data uses 1990-2006 AAC accident statistics for consistency.)

Below is a bar graph (sent to me by my friend Clint Cummins) showing the main causes of death in the US in 1988 for age 15-44, by sex. Motor vehicle accidents is the biggest cause of death for males. Mountain accidents would be included under "other accidents," a category which likely includes a fair amount of non-mountaineering accidents such as falling off ladders, crashing motorboats, housefires, etc. Altogether, "other accidents"  have about the same death rate as suicide, diseases, cardiovascular, and cancer.

(Random notes: In higher age groups, cardio, rather than motor vehicle accidents, dominates. This bar graph was created out of 1988 data, when the AIDS death rate was higher than it is now.)

---

A Note on Conditional Risk
The previous section used statistics to show that climbing accidents are relatively rare in the grand scheme of things. However, it is still important to be aware of the very real dangers in the mountains. Conditionally, mountaineering can be a risky undertaking (for example, it would probably be much more dangerous to go climbing on loose rock in poor weather than to drive down a residential street mid-morning). But, for some people, the risk adds to the fun and adventure of climbing.

Cartoon by Randall Munroe, found on XKCD.com.

---

Personal Accident Accounts

I've had the misfortune of being involved in two separate mountaineering accidents in Washington state. Both were caused by loose rock in rugged alpine terrain. In both cases, the climbing party was very experienced, and a series of good decisions resulted in a successful rescue. Click the links below to see the accident reports complete with photos.

Accident 1
In July 2009, my partner fell 60' and broke his femur and heel, requiring a shorthaul of the north buttress of Mt. Terror. This rescue was complicated by the fact that a second uninjured person in our party was stranded on the mountain for 4 more days when poor weather prevented him being able to be airlifted off when the helicopter returned.

Accident 2
In Sept 2010—ironically, only a week after I posted this article on accident statistics—I suffered a severe compound fracture of my tib/fib on the north face of Vesper Peak. This also required a helicopter rescue.

---

Mt. Rainier Climbing and Accident Statistics

I also have a separate statistical study on Mt. Rainier data, which looks at Mt. Rainier Accident and Fatality and Search-and-Rescue statistics, among other interesting data.