I use a 60%/40% mix of Wheat/Rye, then overseed with annual clovers.... usually about the end of August.
In poor soil, dry areas, etc, i may go to 60%rye, and cut the wheat back, the rye seems to maintain better during dry spells or in lousy soil.
By doing so, it pretty much stays green through the winter, and at the spring green-up, it comes back strong and does well usually through March/April. After the winter grains die out in spring, i'll mow one time, and the clover pops; which then does pretty well through the next few months, depending on rainfall.
With this method, i only have to break ground and plant one time a year, but gets plots that will feed from germination in late August, until about June, and sometimes July depending on rainfall & temps. I dont maintain the clover by mowing in the summer, so weeds ten to move in when it gets hot.
These are my plots in late march and early april, during the spring green-up, 6 months after planting:
The wheat/rye/clover mix also works well for planting trails & paths, i seed trails using the same mix...they are access trails to areas that become shooting lanes for hunting, once the seed pops....one of the roads that is now a shooting lane....if you look close you might just be able to see one leg of the tower stand at the end, about 300 yards away...
this is a new area i cleared this fall, a couple weeks after germination of the seed mix...first time ever planted, so far the deer are liking it.
i have also planted various brassicas, but they are "feast & famine" plots...a few weeks after germination, the deer hammer them, and within a month they are wiped out, so we never get the tonnage of forage that we get from winter grains. That being said, i do also mix some rape & turnips in with the clover when i overseed my wheat/rye, but they are the "candy", and not a staple for sustained feeding.
Beans, cowpeas, etc are great...IF you have the acreage & the equipment. Smaller plots of forage beans, etc will likely get wiped out in a month or so, if you have many deer. For me, i dont bother with beans unless doing 5+ acre plots, the deer will eat 'em to the dirt, and unlike the winter grain mix, once nipped down, beans dont regrow....