maplesandpaws- It looks like you did everything possible to protect your maples. Best of luck to you! rufretic- We have a carbon copy forecast for lows and wind-chill here, we are just a day behind you. I think snow cover is key for root zone protection for the in ground maples. For example, this past week we went down to 11F, with lots of snow. One of my remote weather sensors was snow covered and was reading 32.5F. Once the wind picked up, the snow drifted away from my sensor and (once un-buried) the sensor was reading 11F. If you have no snow, then mulch is your next best friend. Go heavy over the root zone, then spread it out over the rest of the bed once the cold snap ends. I am hopeful that we get through it okay, but I am already trying to prepare myself for the possibility that there could be some losses (mentally preparing). I may start putting some money aside for replacements come Spring (financially preparing too). In the event of losses, I find it's best to approach it as an opportunity to improve things and make it better. Find something better to replace the lost tree and it makes it a little easier and sometimes even a little fun.