I have a couple of quibbles in an entertaining story. One, as mentioned above, Thanksgiving is on Thursday in the States, which means that the college break would start on Tuesday or Wednesday. Two, and probably a bit more serious, Walla Walla is in the dry part of Washington, so it, like Penticton but warmer, and has few rainy periods in the winter. Actually it's rather sunny and precipitation would come as snow that would melt away in a few days. Similarly, Colfax, which would also be dry and colder than Walla Walla.
I set my story Palouse in the same area of Eastern Washington, though I come from the rainy, west side of the Cascade Mountains.