In my neck of the woods, if you are planting for grazing, you need to plant now. I don't plant mine for grazing, so I generally try to plant a little later to avoid a hard freeze damaging the heads in spring. But if you aren't worried about harvesting for grain, then that's not an issue.

The only reason I can think of to not plant now would be because of pest pressure from things like armyworms, and you should be at or past that now. Greenbugs, spidermites, and the like might be a problem, but if the seed is treated with Goucho or Cruiser, it should be fine.