From the Vail Daily:
The regulations prohibit outdoor water use on Mondays and require customers to adhere to an odd/even watering schedule on Tuesday through Sunday. Also, watering must occur before 10 a.m. or after 4 p.m. to minimize losing water to evaporation. Property owners may water up to three days per week; those with a street address ending in an odd number can water on Tuesday, Thursday and Saturday. Those, with a street address ending in an even number may water on Wednesday, Friday and Sunday.
More conservation coverage here.