when do smallmouth spawn
Smallmouth Bass Water Temperature Edit. Smallmouth typically will start to move to spawning around 55deg - 57deg Spawn is in full swing when the water temperature start to reach the upper 50's (60deg is widely recognized as the key temp). After the spawn, smallmouth are generally the most active when the water temperature is between 66deg and 74deg. Above 78deg, the activety starts to decrease, but they are still catchable. In late fall when the water temp dips below 55 the activety falls off again, and below 50deg they feed very little.