What the RESO actually is and how big it is
The RESO is a connected indoor pedestrian route through downtown Montreal rather than a single municipal tunnel. The Ville de Montreal describes it as covering a large part of downtown with some 32 km of pedestrian galleries, used by close to 500,000 people a day, and linking around 4,000 shops, restaurants and service points, nearly twenty museums and points of interest, and numerous hotels, office buildings, schools and universities. That page was last updated on 25 March 2026 and is published in French only.
You will also see 33 km quoted, including by Tourisme Montreal's own guide to the network. The two official bodies do not agree to the kilometre, which is worth knowing if you are comparing figures, and neither number changes how you use it. The practical point is that the network is large enough to walk for an hour without going outside, and dense enough that no one walks all of it.
How the network connects to the metro
Metro stations are the anchors of the RESO, and the network was built outward from them. Tourisme Montreal describes the modern network as connecting museums, universities, office towers, hotels, shops and the Palais des congres convention centre, and traces its origin to 1962, when Place Ville Marie was joined to the Fairmont The Queen Elizabeth hotel and the central train station by interior passages, with the idea of a wider connected network arriving alongside Expo 67 and the construction of the metro.
That history explains the shape you will actually walk. The best-connected stretch runs roughly from Complexe Desjardins and Place des Arts in the east, through the Montreal Eaton Centre and Place Montreal Trust near McGill, to Place Ville Marie, Central Station, Place Bonaventure and the World Trade Centre Montreal. Riding one stop on the metro between two of these anchors is often faster than walking the equivalent underground, because the pedestrian route is rarely a straight line.
Finding your way without getting lost
Navigation in the RESO depends on following the network's own signage rather than street logic. Tourisme Montreal's advice is to look for the RESO signs posted throughout the network and use them to work out where you are heading, and this is genuinely the reliable method: the passages curve around building foundations, change level frequently and cross under streets at angles that do not match the grid above.
Three habits make the difference on a first visit. Navigate by named complex rather than by street address, because the signage is written in those terms. Note the metro station nearest to wherever you enter, since stations are the only fixed points that appear consistently on both the underground signage and street-level maps. And download the Ville de Montreal network map before you go, because phone signal is inconsistent below ground and the map is published as a PDF you can keep offline.
Opening hours are the real limitation
Opening hours, not distance, are what breaks an underground itinerary. The RESO has no single operator, and neither the Ville de Montreal page nor Tourisme Montreal's guide publishes network-wide opening hours, because there are none to publish. Each segment follows the hours of the building it runs through: a shopping centre closes on its own schedule, an office tower's lobby passage may close when the building does, and a connection through a metro station depends on that station being open.
The practical consequences show up at the two edges of the day and at the weekend. In the evening, sections through office buildings tend to shut first, and a route that worked at 2pm can be broken by 7pm. On Sundays, retail hours are shorter across the board in Quebec, which shortens the window in which the shopping-centre links are open. Late at night the network is effectively unusable as a through-route even where the metro is still running.
Planning a winter day around it
A workable winter day treats the RESO as the connective tissue between destinations you actually want to visit, not as the destination itself. Start at one end and move in one direction, so you are never retracing an indoor route you have already walked. Complexe Desjardins is one of the easternmost practical starting points and sits in the Quartier des spectacles, which puts Place des Arts and the Musee d'art contemporain within an indoor walk of your first coffee.
From there, a west-bound day gives you a natural sequence: the Montreal Eaton Centre and its food hall, Place Montreal Trust, then Place Ville Marie with its own food hall and the stone murals at Central Station nearby. Tourisme Montreal's own suggested route continues east again through Place Bonaventure to the World Trade Centre Montreal, which holds a section of the Berlin Wall given to the city, and on to the Palais des congres. Break the walk with one metro hop rather than doubling back on foot.
Two things to build in. Dress for outside anyway, because you will surface at some point and because the network is heated to indoor temperature, which makes a heavy coat uncomfortable underground. And do the outdoor part of your day first, while daylight lasts, keeping the indoor stretch for the late afternoon when the light has gone but the shops have not closed.
What this guide does not cover
Coverage here is limited to the downtown RESO network and how to move through it, not individual shops, restaurants, ticket prices or exhibition schedules, all of which change independently of the network. The guide also does not cover metro fares or first and last train times, which are set by the STM and should be checked on the operator's own line pages for your travel date, since they vary by line, direction and day of the week.