Early spring is one of the easiest times to catch largemouth bass.
They will start to move up from deep water when the water temperature starts climbing above the 45 degree mark. Keep an eye on the weather. Warm rain warms up a lake faster than air temperature. Generally you will find largemouths in 2 - 12 feet of water. Start fishing for bass in the early spring in the Northwest corner of the lake or reservoir , where the water temperature will be slightly warmer than elsewhere on the lake.