My recommendation would be to hold off on planting. Most throw and grow mixes are dominated by quick growing annuals like rape, rye, oats, etc. There are a couple issues with planting now. First, you likely have not prepped this area for planting. If you just toss it on the soil, any existing vegetation will be coming up soon and competing with it. Also, unless you have real heavy duty equipment, prepping the ground properly will be a chore as it likely has an intact root system. Second, there will be a ton of other food choices greening up soon and providing for the deer, so there won't be as much of a need.
My recommendations, you can use this weekend to prep the area. Pick rocks, remove brush, cut/rake any dead vegetation. In mid-late May, spray with glyphosate(roundup). In late June, spray with glyphosate again. In mid-late July, work the soil, fertilize, and seed. You'll have better results doing it this way and likely a green crop in the fall when other vegetation dies off and provide a food source for the deer when others are disappearing.