I can't help you on where to go but just remember that the prairie rattlesnake is considered a small game animal and you need a license to hunt them and there is only a 2 month season to hunt along with a bag and possession limit.
Critter is right, there is a season and bag limit. I don't know the details, but you can find out easily enough on the Colorado Parks and Wildlife website. There are tons of rattlesnakes in the northwest corner of the state. Find a little water with rocks nearby and you'll be lucky not to step on one. Don't look at the highest elevations.
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.