We used cereal rye for a winter cover crop for many years in Michigan. We did not mow it. In the spring we tilled it under when it was about a foot tall. Occasionally one would pop back up if it wasn't completely tilled in, but rye is extremely easy to pull and it doesn't grow back from the roots like a grass would. I think the only reason you would want to mow is if it started getting so high it would be difficult to till in.
If I were you, I'd till it in now, wait a week or so, and plant it again for a second cover crop to till in in another month or so.
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--Ruth
Some say the glass half-full. Others say the glass is half-empty. To an engineer, it’s twice as big as it needs to be.
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