I'm with STX on this one, if you have many deer, 5000 sq ft will not have a chance IMO, Get that tractor running and you have some great options. Renting a tractor is always an option as well.
I like your mix other than the annual rye, deer may hit it when it is 2-3" but then it gets tough and will out compete for available moisture. A cereal grain rye is a whole different ballgame though.
Only real trouble with oats is they can freeze out (not real common though) S Texas it may not even be an issue and deer love the stuff. Feed store would know the best average time to plant there, it is mid Sept. usually here, so I would assume S Texas would be a bit later.
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