Castle Rock, WA Outdoor Wedding Venue with Mt. Rainier Views
There’s a reason couples search for an outdoor wedding venue in the Pacific Northwest — nothing else quite captures the feeling of saying “I do” surrounded by towering evergreens, golden afternoon light filtering through the canopy, and Mt. Rainier rising in the distance. Alder Grove was built for exactly that moment. Set on the former Crosby family tree farm three miles west of Castle Rock, WA — the official Gateway to Mount St. Helens — and just minutes off Interstate 5, we offer all the natural beauty of a destination forest wedding with the infrastructure, reliability, and accessibility of a professional venue.
The view of Mt. Rainier from our ceremony grounds is one of the most distinctive features of the property. Very few outdoor wedding venues in southwest Washington can offer a true Mt. Rainier backdrop, and fewer still pair it with the eastern presence of Mt. St. Helens — giving Alder Grove a Cascade Range setting that’s genuinely one of a kind in the region. Couples with family in both Portland and Seattle can host a wedding that’s roughly equidistant from both metro areas — about an hour from PDX, two hours from SEA — so out-of-town guests aren’t stuck choosing sides.
Our ceremony lawn comfortably hosts weddings from 25 to 300 guests, with flexibility for any layout you can imagine. Whether you’re picturing a traditional aisle lined with white chairs, a romantic boho draped arch, a rustic timber pergola, or something completely your own, the open grove accommodates it beautifully. Wooded paths, the on-property waterfall feature, manicured garden beds, and the Mt. Rainier-facing ceremony space give your photographer endless options for portraits — and your guests, plenty of beautiful corners to explore between ceremony and reception.



