Wedding timeline: the 12-to-18-month checklist, in the right order

According to a 2025 Mariages.net survey, a large majority of French couples regret, in hindsight, not having organised themselves better during their planning. And the interesting detail is the cause: it's almost never a lack of time. It's a lack of visibility. You forget you have to file the town hall paperwork two months ahead. You discover three weeks before the wedding that you need to order the rings, which have a production lead time. You realise in June that the venue you wanted had been booked eighteen months ago.

The wedding timeline exists precisely for this. It isn't one more to-do list: it's a list of tasks ordered in time, built by starting from the wedding date and working back to today. Each task has a recommended deadline, anchored to the wedding day. This article does two things: give you the complete timeline, phase by phase, and above all explain what makes the difference between a timeline that sleeps in a file and one that actually holds you to the end.

What a wedding timeline really is

The word sounds intimidating, the principle is simple. You don't start from today asking "what do I do now?". You start from the wedding date and work back: the seating plan must be done a week before, so the replies must close three weeks before, so the invitations go out two months before, so they're printed three months before. Each task pushes the previous one back in the calendar. It's this reversed logic that produces the right dates, the ones you can't guess by instinct.

A good timeline solves three distinct problems. Exhaustiveness first: a wedding's tasks are known and numerous (proven lists run around 70 tasks for a classic wedding, more for a religious wedding with all its steps). You don't have to invent them, you start from a base. Timing next: each task has its optimal window, neither too early (no point doing the seating plan before the replies) nor too late (ordering a dress three months out is a scramble). Priority last: at any moment, three or four tasks truly matter and the rest can wait. A good timeline tells you which.

The complete timeline, phase by phase

Here's the structure over 12 to 18 months. Take it as a base to personalise: a simple civil wedding and a religious wedding with a full ceremony don't have the same density.

18 to 12 months out: the foundations. Set the overall budget. Choose the date (often constrained by venue availability). File the town hall paperwork, or at least check the calendar-opening lead times, which vary from one town to another. Book the reception venue, and the ceremony venue if it differs. Then trigger the four critical vendors: caterer, photographer, DJ or band, celebrant if it's a secular ceremony. These decisions condition all the others and the best vendors go 12 to 18 months ahead. If guests are travelling from far away, send the save-the-dates.

12 to 9 months out: the big choices. Start dress fittings (production lead times of 4 to 6 months at designers, plus alterations). Choose the theme, which will act as a thread. Book the secondary vendors: florist, videographer, decorator. Refine the guest list. Think about the honeymoon (booking early opens the best destinations).

9 to 6 months out: the substance. Order the outfits if not done. Build the ceremony run with the celebrant. Choose and order the rings (they have a production lead time everyone forgets). Plan the hair and makeup trials. Book accommodation for guests who need it.

6 to 3 months out: the logistics. Order the invitations and send them (about 8 weeks before). Possibly create a wedding web page to centralise the practical info (access, accommodation, program). Finalise the menu with the caterer. Organise the bachelor/bachelorette parties. Order the cake. Work on the vows.

3 months to the day: the convergence. Close the replies (about 4 weeks before), chase the stragglers. Give final numbers to the caterer. Do the seating plan once replies are closed. Confirm all vendors (times, payments, expectations). Build the day-of timeline and share it with the people who'll coordinate. Final fittings. Settle the balances.

The golden rule: start from the date, not from today

If you remember only one thing: always build by working back from the wedding day. It's counter-intuitive, because our reflex is to list what we can do now. But "now" doesn't tell you whether you're ahead or behind. The wedding date, on the other hand, is fixed. It turns each task into a dated deadline, and a dated deadline is the only thing that triggers action. A task without a date will never get done: it stays forever "to do soon".

It's also what makes the timeline fragile when it lives in a spreadsheet: you have to calculate each date by hand, and above all, if the wedding date moves (a postponement, a change of venue), you have to recalculate EVERYTHING manually. That's the moment most couples abandon their file.

The three ways to view your timeline

A timeline isn't viewed in a single way, depending on what you want from it. Three views, three uses.

The list view is the everyday one: you tick as you go, filter by category, sort by deadline. It's the "what do I do this week" view. The simplest, the most used.

The calendar view spreads the tasks across the months: you see the dense periods coming, anticipate the overlaps, slot in the appointments. It's the "is May going to be hell" view. Useful for smoothing the load.

The kanban view organises by status (to do, in progress, done): you see the progress at a glance, you spot what's been stuck in "in progress" too long. It's the "where do we stand overall" view.

Most tools impose a single view. ÆTHERNA offers all three with an instant toggle, because the right display depends on the question you're asking at that moment, not on a choice frozen once and for all.

The trap of the static timeline

Here's what separates a timeline that holds from one that dies in three weeks: its ability to move with you.

A wedding isn't a frozen project. The date can shift. A task falls behind and pushes the following ones. A vendor imposes their own calendar. A printed or spreadsheet timeline doesn't adapt: at the first disturbance, it becomes wrong, and a wrong timeline is worse than no timeline, because you stop trusting it.

That's why automatic date recalculation is, in our view, the most underrated function of a timeline tool. In ÆTHERNA, if you change the wedding date, every deadline recalculates itself while keeping its relative gaps to the wedding day. You don't redo the calendar, it redoes itself. And because the timeline is pre-filled from sign-up (the "Standard wedding" preset applies a base of dated tasks and budget categories), you never start from a blank page: you adjust a proven base to your wedding.

One observation to close this point: the tasks that slip are almost never the big ones. Nobody forgets to book the venue or the caterer, because those deadlines are frightening enough to stay top of mind on their own. What falls through are the long-lead tasks that never look urgent at any given moment: the rings, dress alterations, stationery, paperwork. They ask for nothing, right up until it's too late to do them properly. That is exactly what a dated timeline protects you from: it makes visible what doesn't announce itself.

As a couple, with an owner per task

Last point, and it connects to the mental-load subject we've covered elsewhere: a timeline is more effective as a couple when each task has a clear owner.

The classic "I thought you were doing it" is born of ambiguity: a shared list where nobody is named responsible for anything produces either duplicates or gaps. Assigning each task to one or the other, with progress that updates for both in real time, turns the timeline into a real couple-coordination tool. Each ticks their tasks, sees the other's, and nobody rediscovers at D-15 that an important box was never assigned.

On one side, a file one of you keeps, whose state the other never quite knows; on the other, a shared space where the timeline is a common project. The first sustains the mental load on one person; the second spreads it.

FAQ

When should you start your wedding timeline?

Ideally 12 to 18 months before the date, because that's the booking lead time for the most in-demand venues and vendors. You can build a shorter timeline (6 months or less) by accepting more constraints on availability. The earlier the better: a long timeline is lived calmly, a short one is a race.

How many tasks does a wedding timeline contain?

Around 70 tasks for a classic wedding, more for a religious or complex one (some detailed lists exceed 180 tasks). The exact number matters less than the coverage: every category must be present (budget, venue, vendors, guests, ceremony, outfits, beauty, admin, day-of, next day). A pre-filled base avoids forgetting any.

Should you start from a ready-made timeline or build your own?

Start from a proven base, then personalise. Reinventing a wedding's task list is a waste of time and a source of omissions. Presets exist precisely for this: they give you the dated structure, and you add, remove or shift according to your wedding. That's what ÆTHERNA's "Standard wedding" preset does at sign-up.

What happens if I change my wedding date?

In a spreadsheet, you recalculate every deadline by hand. In a tool with automatic recalculation, like ÆTHERNA, you change the date once and every task repositions itself while keeping its gaps to the wedding day. It's exactly the kind of disturbance that kills static timelines.

List, calendar or kanban: which view to choose?

All three, depending on the moment. The list for daily action (tick, filter). The calendar to anticipate dense periods. The kanban to see overall progress. A good tool lets you switch between the three without re-entering anything, because each view answers a different question.

How do you manage the timeline as a couple?

By assigning an owner to each task and sharing a single space where progress updates for both in real time. It's the simplest way to avoid the "I thought you were doing it" and to get out of the configuration where one person carries all the tracking in their head.

ÆTHERNA gives you a dated timeline from sign-up, with automatic date recalculation, three views, priorities and an owner per task, as a couple. Free up to 50 guests, no time limit, no credit card. aetherna.fr