I think you've got a very low chance of snow in the Appalachians if you leave the end of April or the first of May. There may still be some chilly mornings, but those will be countered by the not-yet-100 degree days crossing Kansas.Appreciate the information..... Looks like a late April early May does sound like my best bet from your information.
From what I hear, the front range of the Rockies is pretty dry so far this season, so everything in Colorado should be melted by the time you get there. Ditto for northern Utah, I'd guess there's not a lot up in Wyoming and Idaho. You may have heard there's a lot of moisture over northern California and up into Oregon, but you've got another month after hitting the Rockies for that to melt.
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