I ran in 25 degree weather on Saturday and felt extremely hardcore. I probably wouldn't do much below that, though, as I don't seem to hate the treadmill as much as some...

Agree about the wind. For me the question about whether to run outside is directly related to what I am trying to accomplish with the run. If I have a tempo run, then it doesn't make sense to go outside and slip and slide all over the place while trying to maintain a pace. Most of my interval work is done a TM, because the local track of usually covered in snow. Long runs on the weekend can usually be done outside and I would go to pretty great lengths to avoid the TM for a run much over 8 miles, although sometimes ya just gotta do'. I guess if you have the right gear anything is possible. I have a gore tex face mask and plenty of cold weather technical clothes.

Just got back from -12 degrees F and big time windchills.. Sweating but could not feel my fingers with two pairs of gloves on. My glasses frosted up when my breath hit the lenses. I ran fast but was not really into it because of the cold. Stay inside, hit the treadmill, watch sportscenter or game show network.

A lot of it is going to depend upon if you have the right gear. With what I currently have in my closet I could run in the 20s; give me my Nike Element jacket and I could be out there in single digits. The hardest part for me is that first week or so getting my lungs used to breathing in such cold air.

Negative 20 degrees F here today (temp not wind chill) and I ran one mile outside. Even with a face mask I could feel the cold weather with every breath.

O degrees F was the temp off my first 10k last January and my first half marathon was about the same.

I can tolerate running most distances in 0 degrees F but prefer to limit most of my sub zero runs to one mile (for my winter run streak) and do the rest on the treadmill.

I commend people like Carson who did zero treadmill miles last year! I am just too chicken for long sub zero training runs outside.

I did 1.5 miles outside as a warm-up for lifting. Truck said -24 on the way to work, thankfully the wind wasn't howling to bad at 5 am!!!! I had to laugh though because it took me 15 minutes to get dressed to go out and run for 10:laugh:

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IIRC it was about -25°C (-13°F) when this picture was taken and the coldest I've run in (that I'm aware of) is around -35°C

It's a matter of dressing appropriately. The only weather guaranteed to keep me indoors is freezing rain, typically I'll avoid running in a blizzard but that's more a case of being visible to motorists.

I HATE being cold. Even my husband has acknowledged that if he gets stationed In Alaska, he will go ALONE. :ohwell:

That bring said, it was 15 degrees today when I ran. It was tolerable. When we lived in Washington, I frequently ran in the negatives.

I would much rather run in rain!!

I commend people like Carson who did zero treadmill miles last year! I am just too chicken for long sub zero training runs outside.

420 days since my last treadmill run.

OMG !! I feel like a wuss compared to you all. I would never consider running outside in any single digit temps let alone negative temps. You are all brave, I admire and commend you all !!

The coldest I have ran in is 35F, but I am also in Southern California so we don't get the frigid weather. I would have to move to the mountains to get anywhere close to the cold temps you all are dealing with.

OMG !! I feel like a wuss compared to you all. I would never consider running outside in any single digit temps let alone negative temps. You are all brave, I admire and commend you all !!

The coldest I have ran in is 35F, but I am also in Southern California so we don't get the frigid weather. I would have to move to the mountains to get anywhere close to the cold temps you all are dealing with.

I've had a couple of runs in the mid to high 20s. They weren't too bad. If it's not too windy it's fine with gloves and a hat and a long sleeve under armour shirt and a shell jacket and long pants. I'll run in shorts down to the high 30s. Short sleeve shirt to the low 40s.

But I live in Central Texas so we don't get a lot of REALLY cold weather and I'm not really equipped for it so I too can't imagine running in single digits or below.

Coldest I've done was 23* F last fall in Vermont. I don't run in winter because that's prime bulking season. I have to say, I don't like much below 40*, though.

WOW, I fee like a wimp after reading from some of you. lol. Being here in the south (Alabama) it normally doesn't get that cold, but thanks to global warming... and the Polar Vortex ~ it was very cold (for us) last week... 13 degrees... I did wait and run in the afternoon that day. The coldest I've run in was 26 degrees and it was very cold. When I ran this morning at 5:00am it was 34, and after about a half mile... it felt great.