Nellisir said:
I live about an hour from the White Mountains, and while I love them to death, don't go hiking there in April. May, or better yet early June, is alot safer. The weather turns on a dime up there, and every year people get lost, sometimes dead, usually because they weren't prepared for sudden changes in the weather. Mt Washington gets snow into May (sometimes June, but not often).
I hike Tuckerman's Ravine on Mt. Washington every April, and I'm not dead yet. However, I do agree with Nell. You need to be smart and prepared for the worst or else ye'll be jumped by Mr. Dead.