Always Springtime Mushroom (Sponges) can be found by April 10th. I looked today at 1 favorite spot and saw 3 that were just pushing through the soil...so the cold weather has slowed them down, but should be up in a few days...the early ones we call blacks, then the grays come and then the large yellow sponges.
The largest yellow sponge I have ever found was 23 inches tall, while normal large is about 10 inch tall.