Cold Weather (CW), aka Winter Strains fruit early spring and late fall in the North and through the winter ni the South, producing highly saleable mushrooms when little fresh produce is available.  Everyone welcomes their appearance.  These require a longer spawn run than WR strains (9-12 months) but most people just let the natural rise and fall of wintry temperatures outdoors initiate furitful carefree harvests while giving the mushroom caps exquisite detailed pattern that is unique to each. 

Note that in the North, early spring crops may need protection from drying winds.