The causitive factor for bluestain is a fungus that needs food (wood), moisture and warmth to grow. Around here we worry about bluing when the daily temperatures are seventy degrees. Like spalt, blue is a process (fungal growth). Spalt and blue do not happen over night. My expectation is that you are in good shape until spring time.
Blue is an issue for sapwood and not the heartwood. Blue is especially an issue in lumber graded for appearance (pine) and not structural lumber. Blue pine can be quite beautiful. I was asked yesterday, "Why does it decrease lumber and log value when bluestained?" The answer from my perspective: blue is inconsistant. One log can be denim blue and the next log looks like mud. Some boards are solid blue and others are not. The general market does not tolerate scattershot diversity. The price drops until the market no longer cares if it is blue or not. Milling cost per board foot sold actually goes up for bluestain. There is additional waste due to decay (fungus=decay process) and checks in drying logs mean broken boards. Finally, when finishing, it is hard to keep the blue "blue." Often the nice blue, with age, becomes muddy and flat.
Perhaps more than you wanted to know. Enjoy your logs while they are still bright!
