Depends a little bit on how you fish. If you are trolling, I'd say you will still be fine from the looks of the weather forecasts (lots of minor fronts coming through). As for fishing shallow, I have done well even to the last week of April. There are a lot of fish in Weiss and they'll be eating something somewhere. Caught them in the grass against the bank one day and 8 feet deep the next, just takes a little looking. Good luck! I am coming down on the 8th of April (mostly for the weather as well) the lake is supposed to be full pool on April 1 and a full moon.