Probably no where on the front range. I'd bet your only hope is either out by Lamar or Sterling. I know they have public reservoirs that can be hunted, but I'm not sure which to recommend offhand. But good luck with that, it's a tall order.
Let me start off by saying I am not a farmer.
I am a deer hunter and I do own a tractor and have all of the equipment - but that does not make you a farmer any more than standing in the garage makes you a car - well, you get the picture!
Having said that - and with most of my ineptitude fairly well hidden - I do think that buckwheat is one of the most under rated cover crops out there.
I say cover crop because I see mixed results as it relates to the deer eating the plants.