Honestly, it depends on where you hunt. I know that's not any help but there are some places I won't go before 12 or 1 and others I won't stay past 9 or 10. As a general rule, I'd say waterfowl are no different than most game and around dawn and dusk are your best bets. Weather is a much bigger factor than time of day in my opinion though with location being a close second. Good luck...it's gotta suck being an uplander from Nebraska coming to Utah 