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Photo: Andrey Yurlov (Shutterstock) 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? “Too cold” comes down to personal preference There’s no clear cutoff when it becomes “too cold” to do a lap around your neighborhood. The American College of Sports Medicine advises against running outside if the wind chill is below negative 18 degrees Fahrenheit, since that’s when the risk of frostbite increases. This isn’t a hard rule though: Kathy Butler , head coach of Run Boulder Athletic Club and two-time Olympian, told Runner’s World that she’s seen her group train well in temperatures as low as 10 degrees Fahrenheit, although on days when “there was no wind, it was sunny, and they were quite bundled up.” For most winter days in which temperatures stay above zero, “too cold” will come down to […]