There was recently a discussion about plowing and clearing bike trails. There were concerns about cost and the environment (from salting). There's another issue of clearing bike lanes (instead of piling snow in them). It's not as big an issue here (this year there's only been one time that snow pushed me out of the bike lane) as it is in Toronto.
Plowed bike lanes and secure storage at transit stations are vital to persuading people to take their bikes to work in the winter, said Councillor Adrian Heaps, chair of the Toronto Cycling Committee. “It’s all part of our target of bike lanes this year and making sure transportation[department] looks at bike lanes as public thoroughfares, just like roads,” Heaps said.
When snow becomes an issue, they point out, it's more important than ever to take the lane.