The airport building itself is open 24-7 amd is always staffed with security and Portland police. Everything in the airport (TSA, ticket counters, baggage claim, food vendors, information, etc) are not 24 hours. Ticket counters open at least 2 hours prior to the specific airline's first departure of the day. You would want to contact your airline or the jetport directly if you want an exact time. Baggage claim offices stay open for the different airlines until their last flight of the night has come in. TSA will be open at least 2 hours prior to the first departure of the day and will stay open until the last departure of the day has taken off. For exact times you'll want to contact the airport or TSA directly.
It is always open. If you are referring to specific airlines, workers should be there two hours before departure.
It opens really early
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