Its a roll of the Dice, but you should be good. I've been out there three times during the Easter week (usually same time as you) and the conditions varied. Some days were sunny with corn on the hills and wonderful outside drinks in the evening sun. Other days were blustery friggin cold, other days were fluffy fluff fluff snow. The biggest gamble you take is catching a rain day. Crowds are generally thinner later in the season, too (with the exception of the Easter week).
Traveling the States and Taking Pictures