I'm from Denver and while there is plenty of landscape options, the Astro is better left for out of town. about 90 min east of denver around Last Chance CO has dark skies. If you want to shoot in the astro in the mountains, you are going to want to be an hour away from any ski resort areas.
What are you trying to shoot? 14-35 range on crop seems to be in the not useful for much range. It seems too tight to do Milky way and too wide for anything deep sky.
Huh? 14mm on a crop is only ~21mm, even 35mm is only ~52mm. I shoot nothing but my 24mm for widefield astro, the two best astro lenses on the market right now are the Rokinon 24mm and Sigma 35mm. Hell, I shot this from a Bortle 6 zone with my 50mm lens (without a tracker as well):
You don't really shoot anything deep sky with less than 150mm focal length.