When is it to cold to bike?????

trainer time?

I don't ride when it is under 50F unless it is supposed to warm up quickly.  My toes get too cold and turn into bricks.

It never gets cold enough here (NorCal) where I couldn't ride. I've ridden in 40F temps and it wasn't pretty, but it was doable with the right clothing. But I usually won't ride if it's raining mostly because I think it's dangerous enough to not be worth it.

Which is not to say that I don't ever end up riding in the rain, but usually it happens because I get caught out in it unexpectedly or it's a race or other organized event that I can't postpone until the rain stops.

And the last time I rode in the rain, I crashed. This reinforced my belief that riding in the rain isn't safe enough to be worth it. (Though I suppose the fact that it was also dark out also didn't help.)

I used to ride if was above 20 with proper clothing. In 2008 I would do a long ride most every Sunday down on the Cape where roads in winter are bit better than were I live and I had some BT friends I rode with in the slower group of a bike club ride.

Recent years I tend to ride when over 40 as my feet and hands get cold more easily then they did few years ago. I do think I had some level of frostbite from riding that makes my hands and feet more sensitive to cold.

Be aware that cold sets in slowly so you may be really cold and not even know it. Finding clothes that wick the sweat and keep you warm is tough. Stopping for long when really cold is bad as the sweat is wet and makes you colder.

55 is my rule of thumb.  once it is that cold i have to wear gloves...and i dont do that.  so < 55 and i am on the trainer.

My .02.

CP2K

I have ridden all winter until I hit black ice once - sure glad I was wearing a helmet.  All too common so I just don't ride outside below 4 deg C (about 39F).  Windchill is a much greater concern to me.  The temperature can be fairly mild but with a strong wind it can really bite.

Not a great fan of frostbite either.

I bicycle commute all year round.  Lowest temp was about 11F.  I don't think I've biked in the single digits.  As mentioned already, the right clothing is the key. 

I'm not sure I will plan on many training rides below freezing especially if overcast --- will hop on the trainer.

i rode a few 28* rides last year...attempted a 23* and my knees started stinging and I bailed.

Proper clothes make the difference

Honey badger dont care... he just goes cycling, spin spin spin in the cold! hes craaaaaazyy

me? sub 65 and im inside. spoiled  san diego

I went to college in Fairbanks, Alaska. Some of the guys I hung out with lived in cabins off-campus and biked to and from school all winter. They had studded tires for their bikes and attached "gauntlet" style gloves to their handlebars. They claimed that it's never too cold, but sometimes you're underdressed. One guy told me about the worst wreck he had, claiming he forgot his goggles one morning, and the tears started to freeze his eyes shut going down a hill. He ended up hitting the snow berm on the side of the road.

It's been in the -40 range up there all week. Sometimes I miss it, but not so much this time of year!