This is a post from Field Crop News, on field corn, but it might be of interest to sweet corn growers as well: http://fieldcropnews.com/2013/05/frost-injury-in-corn-at-the-spike-stage/. It discusses where the growing point of corn is at various leaf stages of early growth and how to evaluate damaged seedlings after a freeze. It includes a video, too.
The growing point of corn is still below the ground until the five to six leaf stage.
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