Post up. King - I wasn't sure if your mention of frosts was a reference to the season or not, or whether it's just always cold on the east slopes of the Rockies overnight. Can you clarify please? I went with winter and so gave a sunup time of around 6 to 7 am. If its not winter, let me know when it is and I will adjust my post and also the timings so that sunrise is sooner.