If at first you don't succeed....

As you found out, the pollen can be vastly different on the other side of the Cascades. Cycle Oregon '07 started and ended in Sisters. I was fine at the start and during the entire trip. But when we crossed McKenzie Pass and arrived back at Sisters, I could not stop sneezing until we left town for Portland where I was again fine.

And at least you didn't take the bus or hitch rides like YKW.