Whitwabit
US Veteran
Fall, after schools are back in session.Far less traffic and tourists and the weather is mild
We've found that traveling when retired is better done when school and colleges are in secession .. Less people at attractions you would like to see .. and usually no unruly kids running around with out parental guidance !!
Either Spring or Fall .. though we like the fall a little better because of the colors of falling leaves .. and there will be snow sometimes in the high country !! That always makes for lovely scenery ..
Gas might be a little cheaper also then in the summer vacation months ..