The first time we booked a Canal du Midi trip, I assumed the canal was open whenever I fancied turning up. It is a canal, not a tide, so what could stop us? The answer, it turns out, is a French word every canal cruiser learns fast: chomage. The annual closure for maintenance, and increasingly for water management, can shut the whole 240 km waterway for weeks at a time, and if you do not check the dates you can find yourself standing on a hire base looking at a locked lock.
So here is how the Canal du Midi's open and closed seasons actually work, what chomage is, why the dates move, and how to plan around it.
What chomage actually means
Chomage is the planned closure of a waterway, usually in winter, so the navigation authority can do work it cannot do with boats moving: draining pounds, repairing lock gates, dredging, clearing banks, and on the Midi the grim, ongoing task of felling plane trees killed by canker stain disease.
The body that runs the closures is Voies Navigables de France, VNF, the national waterways authority. They publish a schedule of chantiers, the planned works, and the chomage dates that go with them. Those published dates are the only ones that matter. Forget what a brochure or a forum post from three years ago says; go to the source for the year you are sailing.
If you are new to all this, the basics of locks, licences and the VNF system are worth getting straight first, and I set them out in the French canals beginners guide.
The normal winter closure
In a typical year, the Canal du Midi follows the usual French inland pattern: it closes for the depths of winter and reopens in spring. The winter chomage has often run for roughly the first couple of months of the year. To take a concrete recent example, VNF scheduled programmed works on the Canal du Midi from 6 January to 28 February 2025, the classic January-into-February maintenance window.
That means the practical navigation season on the Midi, in a normal year, runs from early spring through to late autumn, with the canal shut over the coldest weeks while the gates get fixed and the banks get cleared. Spring reopening dates vary by section and by year, which is exactly why you check VNF rather than assuming.
The complication: drought closures
Here is what has changed, and what makes the Midi different from a straightforward winter-only canal. The region has been hit by serious drought, and water has become the limiting factor, not just the calendar.
For the 2025 to 2026 winter, the closure was extended well beyond the usual maintenance window. The canal was set to be closed to boats until March 2026 because of low water levels caused by exceptional drought, with the annual maintenance, repairing gates along the locks and felling diseased plane trees, beginning on 5 January 2026 and continuing through to the spring reopening. The stated priority was protecting essential uses of the water, in particular drinking-water supply to local populations and aquatic life, ahead of leisure navigation.
That is the new reality. The winter chomage is no longer purely about engineering; it is increasingly about whether there is enough water in the system at all. A dry year can mean a longer closure, restrictions on lock operation during the season, or both. Plan with that in mind.
How many locks, and why it matters for the works
The scale of the maintenance task explains why the closure is so long. The Canal du Midi runs 240 km from Toulouse to the Etang de Thau near Sete, with 91 lock chambers along the way, many of them the distinctive oval shape Riquet's engineers built in the seventeenth century to resist the pressure of the banks. Keeping that many seventeenth-century structures working takes serious annual maintenance, and the gates cannot be repaired with boats passing through. Add the plane-tree felling along the banks and you have weeks of work that can only happen with the canal drained and shut.
For what cruising those 91 locks is actually like, including the oval-chamber technique that catches first-timers out, see my Canal du Midi by boat overview.
When you actually want to be there
Assuming the canal is open, the best months to cruise the Midi are not the same as the months it is technically navigable. May, June and September are the sweet spots: the locks are working, the weather is warm without the August furnace, and you are not queueing behind a dozen hire boats at every chamber. July and August are hot and crowded, with real lock queues on the busy sections. We did our first trip in late September and had locks almost to ourselves, with the vines turning.
So your planning has two layers. First, confirm the canal is open at all for your dates by checking the VNF chomage schedule and any drought restrictions. Second, within the open season, aim for the shoulder months for the nicest cruising. The general case for sailing France in the quieter months, on the coast as well as inland, is in why spring and autumn win the shoulder seasons.
A simple planning routine
Before you book anything on the Midi, run through this.
First, check the VNF chantiers and chomage dates for your exact year and section. The dates move; do not trust last year's.
Second, check for any drought restrictions or extended closures. In a dry year these can override the normal calendar entirely, as the 2025 to 2026 winter showed.
Third, if you are hiring, confirm with the base that your dates fall inside their operating season and that the stretch you want is open. The hire companies track the closures closely and will tell you straight.
Fourth, build a little slack in. Even within the open season, a stuck lock or a localised stoppage can hold you up, so do not plan a route so tight that one delay wrecks the holiday.
Fifth, if you are bringing your own boat, remember the licensing and toll side does not pause for the season. You still need the VNF vignette and, for a private boat, an ICC with the CEVNI endorsement, covered in the CEVNI and ICC licence for French waterways.
How chomage affects you mid-season
It is a mistake to think of chomage as only a winter thing. VNF also schedules shorter works during the season, a few days here to fix a lock, a localised stoppage there for bank repairs, and these can catch you out mid-trip if you have not checked.
The published chantiers list covers these too. Before a longer cruise I scan the schedule for my whole route, not just the start date, so I know whether a particular lock or pound is due to shut while I am passing through. A one-week hire from a single base is usually fine, because the company plans around known works. A longer one-way passage across several sections needs more care, because a stoppage halfway can strand you on the wrong side of a closed lock with no way round.
If you do hit an unexpected stoppage, the lock-keepers and VNF staff are your best source of real-time information. They know how long the work will take and whether there is a way through. On a canal, unlike at sea, you cannot simply choose another route, so a stoppage means waiting it out or turning back. Build that possibility into your plan and it becomes an inconvenience rather than a disaster.
Why the dates keep changing
It is worth understanding why you cannot just memorise a fixed closure window. Three forces push the dates around year to year.
The first is the maintenance backlog. The plane-tree disease has forced a huge, multi-year felling and replanting programme along the banks, and the work moves section by section, so where and when the canal is drained shifts with it.
The second is the age of the structures. Ninety-one seventeenth-century lock chambers need constant attention, and a gate that fails inspection can trigger work that was not on last year's schedule.
The third, and increasingly the dominant one, is water. The drought years have made the canal's water budget the deciding factor. When the feeder reservoirs are low, VNF has to ration, and leisure navigation comes behind drinking water and aquatic life. That can mean a later opening, an earlier closing, or restricted lock operation through the summer to save water. None of that follows a calendar; it follows the rain.
The Canal du Midi rewards the cruiser who does the homework. Turn up without checking the chomage and a dry winter can leave you high and, literally, dry. Check the VNF dates, aim for the shoulder months, and the canal opens up into exactly the slow, sun-striped waterway you booked it for.
