I am planning to ride the GAP-C&O trail from Pittsburgh to DC with some friends in June. We are driving to DC and taking the Amtrak to Pittsburgh, and then riding back to DC on the trail. Hopefully the weather will be nice and the trail dry, but I'll probably have fenders on my bike unless it's a sure thing. I wouldn't have minding going in May but we are making our plans around several people's schedules.