How Cold is Too Cold to Run Outside?

By: Meredith Dietz writing for Lifehacker

When I signed up for that spring marathon, I envisioned myself at the end of a breezy race day: exhausted, victorious, and comfortable in weather-appropriate leggings and a tee shirt. What I failed to consider then, and what I am reckoning with now, is the reality of marathon training in freezing temperatures.

Many runners and winter athletes will tell you that running the cold is not as tough as it looks. Sure, the first few minutes suck–but you’ll surprise yourself with your ability to withstand harsh winter days. Personally, I prefer frostbite over any treadmill run that lasts longer than 20 minutes. But is there a point where winter runs cross over from difficult to dangerous? How cold is too cold to run outside?

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