What's Happening Here?

# 3 Green

I thought this was an interesting find the other day.  Can anyone explain the difference between the two color variations in the photo above?  Do you notice the lighter green on the right and the darker green of the left?  I'll give you a hint, the condition showed up a few days following the cold spell we received just after the first of the year.  Ok, here's what's going on.  The area on the right was exposed to the cold air temperatures while the rest of the green of the left was not.  When we came into work that morning we had to pull the cover back over that portion of the green on the right.  Sometime during the night the wind lifted the stakes out of the ground and the cover folded back, exposing the right corner of the green.  That exposed area was frozen solid.  A few days later the color difference showed up.  The area hit by the cold air temperatures and frozen ground is just showing more signs of dormancy than the other portion of the green that did not freeze.  No damage has occurred, but it does make for interesting conversation.