I think it would be possible if you walk slowly and carefully enough in perfect conditions. But where is the fun in that? Some of my favorite memories I have spent on trail are situations when I've walked in less than ideal conditions. However, if there was one thing that I think I could do that would decrease my chances of running into rattlesnakes, it would be to stop walking before sunset during the hot summer months. Unfortunately, I often enjoy walking an hour or two past sunset so I guess I'll just have to keep my eyes open.