Usually, the earlier snows only last a few days and can be more rain than snow initially.
You may want to bring some polypro thermals. If you don't have any, any of the million outfitters in town will have some.
For you Morgan, if you are out in the weeds tromping around, I would get some ankle gaitors if you don't already own some. They keep your shins clean and from getting banged up, as well add some warmth.
Wool socks are also key. I think the Kiwi should know about wool already
They call my homestate of Wyoming something similar. Where the men are men and the sheep are scared. Apparently they got 16" in Steamboat area. There is a tire place in Denver called Meadow Creek Tire Warehouse. They have a huge stock of snow tires this time of year. We'll have vehicles going up tomorrow night. If anyone cares to have us pick up some tires for them from Meadow Creek call me directly at 303-758-1982. If I'm not home leave a message and I'll call you back. They carry both Nokian and Gislaved, which are Finnish and Swedish snow tires respectively. Probably carry Blizzcraps too if that's what you want.
Jeffy and I leave sunny 80 degree Michigan, fly into Denver, go to the Hertz office, and watch the road condition cameras that show SNOW at the Eisenhower tunnel. Then, on leaving the lot, there is a huge barrel of ice scrapers (we ask for one).
Driving up, we stop to change drivers, and throw snowballs.
This did not give us warm fuzzies (shades of "mountain salt").
Fortunately, the COG organizers gave us "Chanber of Commerce" weather (other than scraping windshields in morning).