Next week, my girlfriend and myself are renting a car and driving from Seattle to Portland (we are visiting from the UK). Despite the current rainy weather we would love to go camping along the way. We have 3 nights to camp (all weekdays), and ideally would like to visit two different places - one in Washington and one in Oregon.
It seems like a lot of the main campgrounds with facilities in the major national parks (e.g. Mt Hood, Mt Rainier parks) are closed for the off season and don't re-open until May. Apparently wild camping is permitted in Oregon, so there is always the option to do that, but ideally it would be good to go to a maintained campsite.
Are there campsites near either Seattle, Oregon or in between that are open during the off-season (for future reference, this is early April), or areas where the weather will not have closed the campsites? Ideally, we would prefer to be in a forest - if it's possible to camp (or wildcamp) at low altitude in the Mt Hood national forest that would be great!
Thank you for your help!