Originally Posted by Daily Commute
Keep your bike inside on both ends of the trip. It will be less likely to freeze. I have never had this problem on my 20-45 minute winter commutes. I know nothing about how a freewheel works, but could this be partially the fault of a dying freewheel? Maybe a new one would not have the problem.
Actually, most everytime this has happened, the bike had been in a warm building. I'm thinking that keeping the bike cold might be a better solution. That way snow and ice won't melt on the warm freewheel/cassette surface & work its way inside, refreezing and fouling the pawls.