Frozen Ass Fifty
The Frozen Ass Fifty is a 25k and 50k race put on by Gord's Running Store. This race is mostly flat, which makes it a good choice for your first winter ultra. Runners can expect a well supported race, and added challenges with the unpredictable weather that February brings with it.
The Frozen Ass Fifty happens mostly on bike paths, however, due to the almost certain chance of them being snow covered the run has more of a trail feel to it.