Which month would be best to come? We are looking at next year and am curious as to which would be the best.
Early August is still summer busy. Later august can be less busy. Weather is warmer in august but still good in September. Fall foliage is nice in later September. Some summer activities close or scale back hours after labor day. Depends what you are looking for for which is better.
Just after Labor Day crowds tend to thin out till Aspen start turning golden and summer heat is waning. Although you get less daylight time. Also most of the bugs are less "buggy".