Freeze coming - Flowers

[tam91]

We've had this lovely early spring, but it is now supposed to freeze tonight. Like 28 degrees.
*Naturally* this is the year I planted lots of new spring bulbs, all of which are up budding and/or flowering. I also have large patches of beautiful Virginial Bluebells, just begun flowering.
Any ideas of how (or if) to protect these - all over the yard?
I suppose the crabapple trees just starting to bloom are a lost cause, no way to cover the tree I guess.