Thinking about living in Boulder while working in Denver? You’re not alone. The Boulder to Denver corridor gives you several solid commute choices, each with its own tradeoffs in time, cost and convenience. Whether you prefer to read on the bus, drive off-peak, or mix in bikes and shuttles, you can build a routine that fits your lifestyle. Below, you’ll find practical details to help you compare the Flatiron Flyer, driving on US 36, and more. Let’s dive in.
Boulder to Denver at a glance
Boulder sits roughly 25 to 30 miles from central Denver. Off-peak, driving can be 30 to 40 minutes. In heavier traffic, expect longer times. By bus, the Flatiron Flyer typically runs about 40 to 60 minutes, depending on the time of day and stops.
If your schedule is flexible, driving may be fastest outside rush hours. If you value predictability and less stress, the Flatiron Flyer offers a consistent ride and the ability to work, read or relax while you travel.
Flatiron Flyer basics
The Flatiron Flyer is RTD’s bus rapid transit service on US 36 linking Downtown Boulder and Denver Union Station, with stops at key stations along the corridor. It runs multiple routes with frequent service during weekdays and daytime hours. You can review route details and schedules on the RTD Flatiron Flyer overview.
How long it takes
Scheduled trips commonly land in the 45 to 50 minute range between Downtown Boulder Station and Denver Union Station, with real-world trips typically 40 to 60 minutes depending on time of day and stop pattern.
What it costs
RTD’s simplified fares, effective Jan 1, 2024, are designed to keep transit affordable for regular riders. Standard fares include a 3-hour pass at $2.75, a day pass at $5.50 and a systemwide monthly pass at $88. See current details on RTD’s fare reform announcement.
Where to board
Many Boulder riders use the US 36 & Table Mesa Park-n-Ride, Downtown Boulder Station, or Boulder Junction. Table Mesa is one of the largest access points, with a posted capacity of 824 spaces. Check rules and availability on the Table Mesa facility page.
First and last mile options
Boulder makes it easy to connect to regional buses without a car. The city’s HOP circulator, BCycle e-bikes, Lime e-scooters and Bike-n-Ride shelters expand your reach from home or work to major stations. Explore options on the city’s HOP bus and micromobility page.
Driving US 36: what to know
If you drive, US 36 offers general-purpose lanes plus Express Lanes between Boulder and Westminster, with connections toward I-25. Off-peak, you can see 30 to 40 minutes. During rush hours, plan for extra time and always check live apps before you go.
Express Lanes rules and HOV
US 36 Express Lanes use dynamic tolling that changes with demand. Motorcycles ride free, and HOV 3+ vehicles can travel free with a switchable HOV transponder and an active ExpressToll account. Get corridor basics on CDOT’s US 36 Express Lanes page.
Safety, access points and fines
Follow posted entry and exit points. Crossing solid white lines or entering illegally can result in civil penalties. Colorado expanded automated enforcement across tolled corridors, and as of Jan 1, 2025, civil penalties start at $75 if paid within 20 days. Learn more on CDOT’s Express Lanes use and enforcement page.
Vanpools and EcoPass
If you ride often, an employer EcoPass or a Neighborhood EcoPass can cut costs and simplify your routine. Many Boulder employers and neighborhoods participate, and the city supports programs that make passes more affordable. Get details on the City of Boulder’s EcoPass program.
Projects that could change your commute
Boulder and regional partners are investing in long-term mobility. Two efforts to watch:
- CO 119 Bus Rapid Transit improvements. This project aims to improve transit speed and safety in the CO 119 corridor, an important mobility link for Boulder County. Follow updates on RTD’s CO 119 BRT project page.
- Northwest Rail planning. RTD completed a peak-service feasibility study in 2024 for potential commuter rail from Longmont through Boulder to Denver. It is a studied possibility rather than a near-term certainty. Read RTD’s Northwest Rail feasibility update.
How to choose the best option
- If you want predictable travel and time to work or read, ride the Flatiron Flyer.
- If you drive off-peak, the car can be quicker. In peak periods, budget extra time.
- If you carpool, consider HOV 3+ in the Express Lanes to reduce or avoid tolls.
- If you live near Table Mesa, Downtown Boulder Station or Boulder Junction, transit can be especially convenient.
- If cost matters, check employer or neighborhood EcoPass options that lower your out-of-pocket spend.
What this means for buyers and sellers
Commute options can affect your daily life and housing choice. Proximity to Table Mesa Park-n-Ride, Downtown Boulder Station, or quick access to US 36 can make a noticeable difference in time and flexibility. If you expect your routine to change, ongoing projects like CO 119 BRT and long-term rail planning offer helpful context for future mobility.
Ready to size up neighborhoods through a commute lens and find the right fit for your lifestyle? Reach out to Arlene Burgess for local guidance tailored to how you live, work and move around the Front Range.
FAQs
How long is the Flatiron Flyer ride from Boulder to Denver?
- Plan for roughly 40 to 60 minutes, with many scheduled trips around 45 to 50 minutes depending on the time of day and stops.
Is the Flatiron Flyer frequent enough for daily commuting?
- Yes. Multiple routes run with frequent service during weekday peaks and daytime hours, and RTD posts current schedules on the Flatiron Flyer page.
What are the US 36 Express Lanes rules for HOV 3+ and motorcycles?
- Motorcycles ride free, and HOV 3+ can travel free with a switchable HOV transponder and an active ExpressToll account, subject to posted rules and access points.
Are there fines for improper Express Lanes entry or crossing solid lines?
- Yes. Colorado enforces Express Lanes rules with automated systems, and civil penalties start at $75 if paid within 20 days.
Do I need a car if I live in Boulder and work in Denver?
- Not necessarily. Many residents rely on the Flatiron Flyer, vanpools and EcoPass programs, though your office location, hours and last-mile needs may influence your choice.
