The general grazing/feeding restriction after the use of glyphosate herbicide is 60 days. However, this can vary with the formulation or specific glyphosate product that is used; so check the product label. Although I am not completely certain of the management objectives for this particular field, it may be better to harvest for hay first; and at a time sufficient for at least some regrowth to occur, apply the glyphosate to kill the grass.
FAQ #28956
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In an expiring CRP setting, if grass is sprayed with glyphosate early fall or after first freeze, would it be safe to hay and feed to feeder cattle or would there be a risk?
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