I feel your pain! I had some crocus bloom and after the last cold snap they are still trying but are now so droopy you can't see the blooms. I've been trying to cover up vulnerable perennials with sheets but I'm not sure it's working. I'm sure I'm going to lose double digit numbers of perennials this year for the third year in a row.
It's at the point where I guess I'm going to have to consider everything an annual (or a short-lived perennial).
I only have 1 dwarf rose bush that I bought a cover for. It's blown off quite a few times with the strong winds so I've staked it so it can't blow off anymore. The silly plant has already started to leaf out! I'm hoping the cover will at the very least keep the plant from dying. April can't get here fast enough for me!