Best fishing time is whenever the best weather time happens in the spring months. If you can be flexible, then pick the best weather days during the spring. Weather is usually a little more stable and predictable in the late summer/fall months but then fishing is a bit more unpredictable then, so its a give and take. We also have a trip planned for that time frame in April, we have to collaborate on schedules so we aren't as flexible and have to hope for the best weather, unless its going to be a hurricane we usually go no matter what and do pretty well regardless, spring time fishing at Powell is unmatched.