The blue status light means that we're entering freeze-thaw conditions. The trails are most vulnerable to long-term damage this time of year and then again during the spring thaw. See this post
for more information.
Please: only use the trails when they are frozen over the winter. If you ride, run, or hike when the tread is thawed you will create ruts and mudholes.
This weekend, for example, would be a very bad time to ride. Yes, it will be warmer, but that means the tread that has been frozen all week will turn to peanut butter. Get your ride on this morning while it's still cold.