Producers wanting to add to or improve the forage species in their existing pastures should typically consider using either the frost seeding method in February and early March, or interseeding later in the spring months. This has been an unusual end to the winter, so as soon as the snow melts, frost seeding can begin.
Iowa State University
Barnhart, Stephen K., "Consider Frost Seeding or Interseeding Pastures This Spring" (2019). Integrated Crop Management News. 2532.
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