Do we need a permit to elope at outdoor spots in Seattle?

In most cases, yes. Even for a "just-the-two-of-you" elopement, public lands, city parks (like Seattle Parks and Recreation properties), Washington State Parks, and National Parks often require a Special Use Permit for wedding ceremonies. Permit rules protect local environments and guarantee your time slot. Always check with the specific land manager or local park department at least 30 to 60 days in advance.

On a side note, a simple gathering of just a few friends standing together with you while you have your Elopement wedding can may place at Volunteer Park, Kerry Park, Golden Gardens Park, Discovery Park, Green Lake Park without permits if you are open to a guerilla-style show up and get married get-together.