However, over the next 2 to 4 weeks the risk of freeze injury to annual bluegrass is the greatest. I always use the GCSAA Conference and Show as the "yardstick" or reference when freeze injury for us in Ohio is potentially the greatest. For example, if we get an extended period of warm weather during or immediately after the GCSAA show, where the turf breaks dormancy and greenup occurs, annual bluegrass could be at risk. If this warm period would occur, followed by a significant rainfall or snowstorm with a corresponding rapid temperature drop injury could occur. In this instance, annual bluegrass in low lying or wet areas would be at risk.
The picture below was taken in 2001 at the beginning of April. The actual damage (freeze stress) occurred around the 2nd to 3rd week in February. Authors: Karl Danneberger
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