Square miles is pretty large. ~1/2 of CO is the plains, not the rugged mountains you're thinking of. Still an amazing feat, but one I think can be done. Anothe

Square miles is pretty large. ~1/2 of CO is the plains, not the rugged mountains you're thinking of. Still an amazing feat, but one I think can be done. Another popular thing to do in CO is hike all 58 '14ers' (peaks over 14k feet). I only lived there a couple years, but managed to do 5 without too much planning. An outdoor person, doing outdoor things over 40 years...it makes sense.