Luggage and bags:
The weather here can change in a heart beat. We know how to read the sky - it is the only reasonable way to see what is coming. It is not uncommon in the fall and spring to have the heater on in the morning and evening and the AC during the day. The temps have wide spans. Not as bad as Eastern Montana, where you could have 100 deg. swing in the weather, but it is bad enough.
Clothing/Shoes/Weather Gear: We know you are not a local if you wear shorts in the winter. We think you are stupid.
Camping/Beach/Outdoor Gear: You are close to the mountains. If you want to go skiing or camping - it is not far from Billings.
Clothing/Shoes/Weather Gear: The biggest thing to keep in mind about packing for a trip to Billings or Montana is that the weather can change quickly. I have seen it snow in July and I have worn shorts in December. Bring clothing that can be layered. Expect some cold weather - but as Billings is a dry climate - it seldoms rains here.
There are lot's of things to do outdoors here so make sure you bring a good pair of hiking boots or walking shoes. Casual dress is accepted just about everywhere so bring comfortable clothes. It is usually pretty dry here but the weather can change drastically in a short amount of time so be prepared. Billings in on a valley floor but the nearby mountains have been know to get snow in July on occasion. It can also get in the 90's here in August.
Photo Equipment: Bring lots of film, there are photo opportunities around every corner.
Camping/Beach/Outdoor Gear: There are campgrounds in the mountains within and hours drive or so.