I’ll be interested to see if they can perk back up again. I suspect they will. But even the snowdrops think that two nights of single digit temperatures is a bit much in March.  I have to figure out a better management of that area, the oak leaves are really out of control on that bed, much too thick for the spring bulbs to cope with. They tend to reduce the ability of the bulbs to colonize, and with weather like this they ironically tend to deceive the bulb, which thinks it is warmer than it actually is. (The early bulbs in areas without heavy leaf cover are sensibly waiting) But, they do keep the moisture level and nutrient level high, and that is a very good thing for the area as a whole. Complex things, micro-climates and ecosystems!