This photo is of #6 green towards the end of the December cold spell we encountered in the Willamette Valley. Many golf courses were frozen for two weeks or more with lows in the teens. As temperatures warmed above freezing it began to rain. With the soil profile still frozen, this was the result for two days.
Luckily, we had very little turf damage. I believe this was due to healthy turf and not allowing play on the greens until the entire profile had thawed.