Join Date: Sep 2004
Location: Frisco, CO
Bikes: '93 Bridgestone MB-3, '88 Marinoni road bike, '00 Marinoni Piuma, '01 Riv A/R
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Afternoon thunderstorms are a good possibility but not an everyday occurrence in July. Afternoon thunderstorms are pretty predictable, though, so just start early and finish early if they're predicted. Snow is a distinct possibility in Leadville in September, and some of the ski resorts will start making snow at night in late September. Actually, I've seen some snow in July at and above 10,000 feet, but it's more likely to happen in September.
Either month can be great- in late July the wildflowers will be out, temps will be warmer and days will be longer. In September, aspens will be showing fall colors, crowds will be diminished, and lodging will start to get cheaper. Mornings will be cold though, and the rest of the day might not be too warm either.