Generally around this time, the Northeast experiences the melting phase after a long winter. This year, while we aren't experiencing the standard NY thaw, other regions that had plenty of snow this winter are. Because of the fluctuation in temperature this year, with unseasonably warm and unseasonably cold days throughout the winter, in many places- this has stopped the snow from completely melting for longer than average.
Some exerts have declared this year's snow mold as being the worst they have ever seen. IN Colorado, where snow melts away as quickly as it falls- the snow has covered the ground most of the winter. What was uncovered- was large amounts of fungi from moisture being sequestered all winter without ventilation.
Mold is a natural part of the environment. It is always ubiquitous to our outdoor environments especially. In the case of snow mold, while this isn't a mold species that has the same deadly effects as black mold, it is still recommended to clean up areas in your yard in which it is observed.