I am new to Castle Rock, Colorado. We live on 35 acres and would like to start organic farming. Had some lovely soil delivered and am starting with a 40 X 20 garden. Any suggestions on how to keep the deer from eating everything would be appreciated.

Welcome.

A tall fence all the way around..and I would dig a trench and lay about 6-8 inches minimum under the earth ..rabbits..moles ...and voles ( research to see how deep the moles may go in winter ) If the deer can get a running start..make it tall, although they can jump pretty high from a stationary position. I am sure there are sprays that would be fine in the organic garden but to me..a fence is more dependable and once erected less work.