As one who has done a considerable amount of trail maintenance in my life I urge anyone and everyone to be very careful on the trails in April and May, with a preference to avoiding them if possible. Muddy trails are not just an inconvenience to hikers, but are much more susceptible to damage during the spring thaw. Water bars get damaged, pathways wash out, etc.

Others have noted the weather can be variable and there is danger in the woods at that time of year. I don't care if you make a stupid decision and die on a mountain, just don't wreck the trail while you're at it.