If you're dressed properly for cold weather running, it can be quite invigorating. Follow these tips for keeping your feet warm so you can enjoy those winter runs:
Wear the right socks. Be sure to wear a good pair of wicking socks made of fabrics such as acrylic, CoolMax, or wool. Never wear cotton socks (in cold or warm weather) when running because they won't wick away the moisture, leaving your feet wet and at risk for frostbite. Check out these suggestions for cold weather running socks.
Put foot warmers in your running shoes. Some runners on the team that I coach swear by Grabber Hand Warmers (they also make them for feet) for really cold days. They're easy to use: Just take them out of the package and put them inside your sock, on top of your toes. Once your feet warm up, you can take them out so you don't overheat.
Choose the right shoes. For cold weather running, look for a running shoe with as little mesh as possible, since that's where the cold wind or water will get through to chill your feet. If you can't avoid running in the snow or slush, you may want to think about buying trail running shoes, which are somewhat water-proof and will give you a little more traction in the snow.