Planning a conference in Longmont
What it takes to run an event in Longmont, Colorado: 8 mapped venues, their stated capacities, and the travel around them. Denver International Airport is 50 km (31 mi) out.
The rooms you can book in Longmont
Longmont has a recorded population of 99,818 (2024), inside the Boulder, CO area of about 330,000 people.
What is on the books here: 1 exhibition or convention hall, 1 dedicated conference and function space, 1 arena or stadium and 5 independent event spaces.
By type that is 5 event spaces, 1 stadium, 1 fairground and 1 banquet hall.
Exhibition and convention halls (1)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| Boulder County Fairgrounds Barn A | fairground | not published | 2.5 km (1.6 mi) |
Conference and function space (1)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| D-Barn Reception Hall | banquet hall | not published | 1.2 km (0.7 mi) |
Arenas and stadiums (1)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| Colorado National Speedway | stadium | not published | 16 km (10 mi) |
Independent event spaces (5)
| Venue | Type | Stated capacity | From the centre |
|---|---|---|---|
| City of Longmont Colorado, Civic Center | event space | not published | 0.3 km (0.2 mi) |
| The St. Vrain | event space | not published | 0.4 km (0.2 mi) |
| Villa Tatra | event space | not published | 25 km (15 mi) |
| Altona Grange #127 | event space | not published | 14 km (8.6 mi) |
| City of Longmont Callahan House | event space | not published | 0.4 km (0.2 mi) |
Every venue mapped in Longmont appears above. The ones with enough published detail to be worth reading have their own guide and are linked; the rest are named here, which is honest about what the record holds without giving each of them a page made of three facts.
Exhibition-scale rooms in Longmont
One venue in Longmont is classified as exhibition or convention space.
- Boulder County Fairgrounds Barn Asize not published
Capacities are the figure the venue or an encyclopaedia entry published. They are usually the seated maximum, and the same room in banquet or reception layout can differ by half. Confirm the layout you want before you plan around a number.
How people reach Longmont
Denver International Airport (DEN) is 50 km (31 mi) away, far enough that arrival day is genuinely a travel day and a first session before noon will lose people.
Longmont keeps Denver time (America/Denver), which matters most for the remote speakers you are dialling in.
Boulder, Loveland and Broomfield are close enough to draw from for a day rate, and to fall back on if Longmont has nothing free on your dates.
- Nearest major airport
- DEN
- Denver International Airport, 50 km (31 mi)
- Local time
- UTC−6
- America/Denver, in September
- City population, 2024
- 99,818
- 330,000 across the Boulder, CO area
What to check before you commit
No published capacities
Not one Longmont venue publishes a capacity in the open sources behind this page. Every room on the list will quote you a number directly, but you cannot compare them before you call, so build a fortnight of venue calls into the plan.
Arrival is a half-day
50 km (31 mi) from DEN means most attendees lose a morning to travel. Open registration the evening before and put nothing you care about in the first slot.
The city is smaller than the market
99,818 people live in Longmont itself, but about 330,000 live in the wider Boulder, CO. Your local audience is far bigger than the city line suggests, and so is the commute your day-rate attendees will make.
Pricing this against a real Longmont room
Take 240 people through the door in Longmont — a mid-sized Longmont programme, since no Longmont venue publishes a capacity in open data. The first 50 activated attendees are free on every event, so only the rest are billed, and the total stops moving at 1,000 however many more turn up.
- activated attendees
- 240activated attendees
- billable, after the first 50 are free
- 190billable, after the first 50 are free
- for the whole event, at $5 each
- $950for the whole event, at $5 each
You are billed for people, not for the venue, so the room you choose in Longmont does not change this figure. Nothing is charged for an attendee who registers and never opens the app.
Matching the room to the format
No capacity is published for any Longmont venue, so match the format to the room on your site visit rather than to a number on a listing.
- trade shows and exhibitions
1 exhibition or convention hall means a booth plan is possible in Longmont without renting a marquee.
- multi-track conferences
The exhibition space here doubles as plenary space when the floor is cleared.
- association annual meetings
An association meeting needs one big room, several small ones and a hotel block, which is the combination Longmont is set up for.
- training days and workshops
1 purpose-built function space is the easiest kind of room to run a workshop in — the power and the load-in already assume it.
- leadership retreats
Smaller rooms suit a retreat better than a hall does, and Longmont has them.
Where this data comes from
- GeoNames, CC BY 4.0
- US Census Bureau, Vintage 2024 estimates
- Wikidata, CC0
- Geographic data © GeoNames, licensed under CC BY 4.0.
- Venue data © OpenStreetMap contributors, available under the Open Database License.
- US population figures are US Census Bureau Vintage 2024 estimates.
- Retrieved 3 September 2026. event67 has no commercial relationship with any venue listed.
Last updated
What it costs
- Free up to 50
- activated attendees, on one live event
- $5
- per activated attendee beyond 50
- $4,750
- the most one event can ever cost, whatever happens past 1,000
Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
Questions people actually ask
Price a Longmont event at 240 attendees — what is the total?
240 activated attendees means 190 billable after the free 50, so $950 for the event. The price is $5 per activated attendee beyond the first 50, and the total for one event stops at $4,750 however many more attend. Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
How big an event can Longmont hold?
No Longmont venue publishes a capacity in the open sources behind this page, so there is no honest number to quote. 8 venues are mapped here and each will quote a capacity directly. Ask for the seated, theatre and reception figures separately — they differ by a factor of two or more in the same room.
Does Longmont have a convention centre?
Yes — 1 venue is classified as exhibition or convention space in Longmont, including Boulder County Fairgrounds Barn A. Exhibition halls are booked by floor area rather than by seat, so ask for the hall sheet with column spacing and load-in access rather than a capacity number.
Which airport do attendees fly into for Longmont?
Denver International Airport (DEN), about 50 km (31 mi) from the city. It is the highest-traffic airport within reach in this dataset. Local time is America/Denver; publish every session in that zone and let attendees' phones convert it.
Is there a free tier for a small Longmont event?
One live event with up to 50 activated attendees costs nothing. Beyond that it is $5 per activated attendee beyond the first 50, and the total for one event stops at $4,750 however many more attend. Activated means the person claimed their invite and opened the app. Not when you import them, not when the invite is delivered, and not if they register and stay home.
Keep reading
Nearby cities
- Holding an event in Boulder
17 venues mapped
- Holding an event in Loveland
11 venues mapped
- Holding an event in Broomfield
2 venues mapped
- Holding an event in Thornton
10 venues mapped
- Holding an event in Arvada
2 venues mapped
Up a level
Running something in Longmont?
Set the schedule, invite the room and watch who actually turns up. Free for your first 50 activated attendees, on one live event.