Earlier the better - watching the sun come up leaving Denver is not too bad!
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You would be good to go, the traffic on Sundays starts around noon or so coming East out of the mountains towards Denver. Basically in simple terms it’s just bad traffic going up into the mountains at the start of the weekend and it’s bad coming down out of the mountains at the end of the weekend. If you hit it Sunday morning going west you should be totally fine as you’d be swimming against the traffic.How about Sunday morning early?