2 inches of fresh snow fell last night. With temps falling and a good amount of rain, I suspected this may happen. In early spring, this is not uncommon. What I have observed is that the durations of a species mating season may be impacted. For example, the Wood Frog, Rana sylvatica will only do a strong chorus for 2-4 days if conditions are good. If their season is interrupted during that strong chorusing time, they never seem to build up to that level again. There may be stragglers, but the season in effect is cut short.