Fresh sweet corn can be worth the wait. Gardeners usually plant corn (Zea mays) 10 days to two weeks after the last spring frost, when the soil temperature begins to warm. If corn is planted when the soil temperature is 60 F, then corn sprouts typically break the soil surface in 10 days to two weeks.If you planted sweet corn and two weeks passed without sight of the first green shoot, then several factors may have caused the delay.ardeners usually plant corn (Zea mays) 10 days to two weeks after the last spring frost, when the soil temperature begins to warm.