Hunt the edges. Look for early green up areas, try to be around those in the mornings and evenings. I find that areas that left some patches of standing timber around edges or cold zones often hold the highest number of animals.
I had a really nice buck found in southern Idaho several years ago. The kind you don't quit hunting until you succeed or the season ends. Early august the area he lived in went up in smoke in a similar size burn as the one you have. The fire started near the bucks location from lightning. It burned until about August 19th if I recall correctly. Ten days before season...
I spent the season trying to figure out where those deer went. I hunted way down and up the drainage but never turned up a buck worth hanging my tag on. A few days after season (3rd of October) I decided to drive out into the burn. To my amazement I found my target buck living right where he had been before the burn, now with very little cover and almost no visible feed. His legs and antlers were nearly black. I believe he had gone straight back to his bedroom within two weeks based on the amount of tracks in the burn. Had I went in a few days earlier, I may have had a shot at that stud...
Moral of the story, if you have bucks pre-scouted and the fire is out, check up on their previous location and see if they came back
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