Step 1. Time your mushroom hunt for early spring when morel mushrooms are in season and weather conditions are right. Morels usually grow in moist conditions, just after the second deep spring rain.Another good seasonal indicator is that redbud trees produce tiny blooms during the same period that morels grow.tep 1. Time your mushroom hunt for early spring when morel mushrooms are in season and weather conditions are right. Morels usually grow in moist conditions, just after the second deep spring rain.