Placing a prediction for Colorado/central rockys elk every year, batting .500 , I am.
With the September new moon @ the 20th , I'll wager early rutting activities with an earlier peak around the 4th of October and less vocal bulls by the end of muzzle loading season ~ 1st rifle.
Banking the wager (swag) on the September new moon intensifying the shorting days.
Since you are able to observe Elk alot I want to ask you about the effect of the full moon during the Elk Rut. My Wife has a either sex Elk tag for here in Arkansas, this will be Oct. 2-5 when the Full Moon will begin but hopefully still rutting.
I hunted in NM and WY. after the rut with a full moon and it was tough but was not sure how much of that was the Moon phase or previous pressure.
Thanks