I won't ride my bike if it's going to be colder than......

[PamNY]

My limit is around 25f windchill. If it's sunny and I really want to get out, cold is tolerable. I'm not equipped to deal with ice, though.

[Melalvai]

It appears my limits are reasonable. Funny, I've had the impression I was crazy for biking in this weather. For my commute, which is short, the limit is what the world throws at me, which yesterday was 5F, and that was painful even for the short distance. But if I lived in a different climate where we routinely got that cold I'd have better gear. I have good clothes and equipment for this climate (the midwest).

If I lived in a milder climate, there'd be no point in having all the gear I have, so I wouldn't have it, and my cut off would be much higher.

That's my commuting limits. Wild horses couldn't drag me out on a recreational ride below ~50F. And yesterday was too cold even for wild horses. (Ok, all the horses around here are in pastures. Not exactly wild.)

[DebW]

My limit is about 15F for my current 6 mile commute. A week or so ago when the temperature was single digits, I only bike 1.25 miles to the bus stop. When I lived only 1.5 miles from work, I biked it no matter how cold, down to -10F or so. But keeping fingers and toes warm on a longer ride is a problem, so 15F seems about right for now. I do have studded tires on my cummuter, so not afraid of black ice, but when the roads are too narrow with snow I'll think twice about riding. Also try to avoid riding whille the snow is falling and cars may be slipping or have limited visibility.