Corporate events, fundraising galas, networking evenings, holiday parties and weddings for 50 to 250 guests can be held at The St Vrain, a historic brick building at 635 3rd Avenue in downtown Longmont, Colorado, in Boulder County. The venue spreads over two full floors and an outdoor courtyard, and the lower and main levels can be rented separately for smaller groups.
Seminars and company events
For company groups the venue gives a range of 60 to 250 guests. The open area of the first floor can be used on its own or with the level below, which has four breakout rooms and a larger open area with several seating layouts and a drink station. Several floor plans are available, and in good weather the space opens onto the courtyard. Free high-speed Wi-Fi covers the whole building. The venue prepares a custom estimate for each corporate event and offers tours in person or online. Typical bookings include holiday parties, galas, networking events and private celebrations, and the house also runs its own holiday market.
Weddings and receptions
Weddings take 50 to 250 guests, and the ceremony and reception area seats up to 250. Couples have two Personal Suites to get ready, a First Look Nook, the Cocktail Lounge, the Bar and the Courtyard. The wedding day runs from noon to 10 pm, with vendor cleanup until 11 pm. The venue provides the basic furniture and setup for the day, and sparklers, bubbles or smoke can be used for the send-off. Pets are welcome around the ceremony.
Rooms and capacities
The listed spaces are the Main Floor, the Cocktail Lounge, the Bar, the Courtyard, Personal Suites 1 and 2 and the First Look Nook, plus the four breakout rooms and open area on the lower level. The ceremony and reception area seats up to 250, the largest figure the venue states. The site does not give capacities for the individual rooms.
Catering
Events use one of the venue's six catering partners. The St Vrain holds a liquor license and runs the bar with all-inclusive or custom packages. Outside alcohol is not allowed under Colorado law. The bar starts closing 30 minutes before the end of the event, and service stops 15 minutes before the rental ends. Co-owner Bailey Fink also runs Sugar Pine Catering, and co-owner Judi Sperry runs Dotting the i Events.
History and setting
The building dates from 1918. Inside, brick walls, wood ceiling trusses, exposed ductwork and beams, distressed concrete floors and chandeliers give it an urban, industrial look, with plenty of natural light.
Getting there
The venue is in downtown Longmont, about 12 miles northeast of Boulder. Hilton and Marriott hotels are about 2 miles away, and The St Julien and the Boulderado are in downtown Boulder. Hotel Longmont was announced to open across the street in December 2025. Denver International Airport is the nearest major airport.
