Also look into the Barn Shelter at Tolt-MacDonald Park in Carnation. Pretty park, gorgeous big maple tree near the shelter would be a lovely place for a wedding.
We had an August wedding at Barnworks on Vashon Island and it was amazing and lovely and really inexpensive. Lots of great and reasonable local catering options, too. Let me know if you’d like referrals.
Not sure if they still do it but Lord’s Hill near Snohomish was set up for weddings in the past. The son of the owners of Remlinger’s in Carnation owned it. Really nice guy.
Manchester State Park has an amazing stone/conctrete barn-open space amazing, beautiful acoustics with tables and is brilliant on a sunny day. In the spring the grass surrounding the structure is filled with tiny daisies. It is popular for weddings.