In a place like Jackson, it is not other people you have to worry about; it's the forces of nature. The murder rate in the town is zero, and the rate of violent crimes is close to that. See the JHPD website for more.

The surrounding Jackson Hole valley and the Grand Teton Mountains can be hazardous for travelers uneducated about the risks.  An easy way to get educated is to take a look at Be Prepared Teton County. Keep in mind that the site considers worst-case scenarios - most of which would never happen within Jackson itself - so you shouldn't become overly paranoid about the possibility of disaster. Remember also that Jackson is not really the wilderness; St. John’s Hospital is located on East Broadway, close to the center of town. However, it’s better to be safe than sorry, and natural disasters are rarely fatal if you know what to expect and follow common sense.

With this in mind, the main threats in Teton County are blizzards, flooding and forest fires. Blizzard conditions are typically just an inconvenience, because serious injuries can be avoided simply by obeying road closures and avalanche warnings. Flooding in the spring and summer is slightly more unpredictable, because it’s caused by the combination of April showers (which really last all season) and melting snow. Summer thunderstorms, too, can bring heavy rains and powerful lightning – be sure to get inside as soon as you see a flash! Forest fires can be dangerous if you’re up in the mountains, but in Jackson the most you’ll have to do is stay inside to avoid breathing excessive amounts of ash.