So, I'm planning on taking a nice long trip west of the Mississippi for the first time this summer. I don't have any specifics on where I'm headed yet, but I know there will be some mountains involved, and I was curious about needing to pack differant gear than I do here in the Southeast for a summer trip. Can I get a little help?

My typical gear list for summer in KY:

poncho tarp or TT Contrail, depending on forecasts or trip length
20* bag, which winds up staying unzipped and half-off me all night (first down quilt is coming soon!)
rain gear is almost always a poncho only
aqua mira unless I'm hitting an area with a clay bed, then I go with a filter and clean it regularly
my typical clothing stuff sack only has a lightweight baselayer and a vest or zip-up for insulation

My concerns deal mainly with bringing enough to stay safe, temp-wise. Any input is appreciated!