Not sure if I actually posted a reply just now or not so apologies if I already had! Nor v good on forums! Anyway Im also doing this trip so very excited but Julia have you any idea what the temperature will be like as I know we are covering a large area. No idea what to pack!
Hi mlesleyk
Like many JY tours I think there will be quite a range of temperatures so I think layers are the best things to pack. At the moment the average temperatures in most places are 20-25 but expect it it to be colder at altitude, especially Yellowstone, so I am taking hat and gloves (we might even see snow).
From Salt Lake City onwards I expect it will be getting hotter, and be prepared for heat in Las Vegas where the temperature is nearly hitting 40! Don't forget your swimwear as a lot of the hotels have pools. I never take anything too dressy, if there is time to change in the evenings most people will still be casual although you might want to sparkle in Las Vegas.
Hope this helps
Ps don't forget sunscreen and Mozzie protection, those little blighters get everywhere!
BB