About two weeks ago I had 6 acres of woods that were recently cleared for pasture hydroseeded. The area was gone over thoroughly with a Harley rake to prepare the seedbed, a mixture of fescue and bluegrass with lime and fertilizer was applied, then covered with a layer of blown-on straw and some tackifier. The property is in central Virginia, and the first week after hydroseeding the weather was pretty typical - highs in the 60's to 70's and lows in 40's to 50's at night. Only about about a half an inch of rain fell during this period. Then this unusually late cold spell hit. The past three days have seen near record lows from 32 down to 28 degrees, with probably two more days of cold to come. Is this change likely to have done permanent damage to my hydroseeding effort and/or killed off much of the grass? I am concerned as the hydroseeding was a considerable investment - $1,800 an acre for over $10,000 in total cost. Should I be worried?