Oh, I'd still cover them Jo Ann. The plants may look a little bent out of shape after this week end but at least you'll save plenty of good foliage for healthy growth and bulb development. I had to tarp again last night and this cold air mass is headed your way for frost and freezing potential for Fri, Sat, and Sun. nites. If you Folks can make it thru the week end, the first half of May looks to be much, much warmer for the Northeast. From St Paul, MN straight down the Mississippi River to St Louis, MO---everyone east of that line has been on needles and pins all Spring, especially those with orchards (and lilies).
P/S Two of my 10 foot X 20 foot tarps tore loose from a couple anchors last nite and I see they're partially collapsed. That usually happens when a cayote or fox gets under there and panics--its happened before.
