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Watch out for changing speed zones in Clatskanie (45, 35, 25)!
Greyhound and Amtrak both have service to the Kelso/Longview station in WA, which is a short drive from the monastery. Columbia County Rider offers shuttle service from this station to the monastery for about $10.
Great Vow is about 75 miles NW of the Portland airport. Once at the Portland airport there are three options for getting to the monastery. The first option is to be arranged to be picked up. If you arrive on Thursday or Sunday afternoon it is possible that someone from the monastery could provide transportation. You must call the monastery and arrange this before purchasing your ticket.
If you cannot arranged to be picked up, a second option is to take Portland's light rail from the airport to the train station. Then take Amtrak to Longview/Kelso, then Columbia County Rider  (503.366.0159) to Clatskanie, and we can pick you up in Clatskanie.
Your third option is Blue Star Bus  (1-800-247-2272). Blue Star Bus offers one-way service from the Portland airport to Great Vow for roughly $100, by cash or credit card to the driver. The bus runs every half hour from 8 am to midnight; advance reservations advised.