After a very rainy, almost freeze-free winter, it's warming up. The low temperatures have been mostly in the 50s and the highs in the mid-60s to as high as 78. With that bit of encouragement, the buffalo grass started sending up a few tiny green blades of grass. I responded by cutting them all off.
Mowing the grass short in early spring lets the sun reach the base of the plant where the new growth will come from. It trimmed off most of the dry ends, revealing a blotchy greenish lawn. By the end of March it should be all green.