game4lunch hit the nail on the head. I have my best luck in the first week though asthe oldest cows will come into cycle the middle to the end of august. The larger bulls will be seeking out the already hot cows at this time. This will be going on in areas that have a larger percentage of older cows. Meaning areas with less pressure and a lower rate of filled cow tags from previous years. Sounds like you will be going with someone, so you won't have the advantage of looking around preseason, so the 3rd week may be the best to insure a better hunt as that is when the peak rut kicks in.