Cold this morning!

I woke up this morning (Friday, March 25, 2011 at 7am) to discover the temp went down to 30 degrees, frost only on car windows but still with cool weather crops in the ground I was a bit dismayed that I had let that slip by me, whereby I could have played with row covers last night ;-) Still the collards, kale and spinach look just fine, perhaps liking the cold temp (ground temp was about 45 degrees).