freezing temps on Thursday

I'm also in Colorado. and even though I'm in the mountains, a lot of the temps depend on microcosms around you. If the trailer is near buildings for protection, it will be warmer than the general recorded temp for your region. This is also affected by things like plants (shrubs), uphill or downhill air flow, etc. I don't think I would worry about it unless they were to call for really cold temps and your trailer's sitting in the middle of an unprotected field or somewhere that the winds will make it colder than what they're forecasting. My experience with this area (I'm a native, so that would be many long years at my age) is that in the spring it rarely gets as cold as they predict.