If you can get there even a day early, a 4-hour hike the week you're hunting can turn up more than all the pre-season scouting most others do. The weather moves elk and deer more than any other factor, and fresh sign found in June means nothing compared to fresh sign found the day before your hunt. Honestly, when I scout pre-season it's mostly for fun and exercise, plus finding access, camp sites, and areas of interest. You didn't say what species you're after, but elk can walk 30+ miles a day. You aren't losing THAT much not being able to get out there two months ahead of time...