One honest caveat before the plan: exact dates move every year and differ by firm, and anyone quoting you a precise deadline for a specific bank is guessing. Treat the timeline below as the shape of the cycle, and check each firm's own page for its real dates. The shape is what matters, because it is the part that does not change.
The 2027 cycle, month by month
Now, over the summer
Decide roughly which sectors you care about, get your CV into a state you would send today, and start a list of firms. This is the only unhurried month you get, and it is the one people waste.
Late summer into early autumn
The first spring week applications open. They open earlier than most first years expect, and the earliest openers are usually the most competitive ones. Have your CV finished before this, not during it.
Autumn
The bulk of the window. Most big firm applications are open, and many assess on a rolling basis, so a good application now beats a perfect one in December. Online tests usually sit at this stage, before a human reads anything.
Late autumn into December
Deadlines start closing. If you have not applied by now you are choosing from what is left. This is also when the first rejections land, which is the moment most people stop.
January into February
Outcomes for most of the big schemes. It is also the point where cold emailing smaller firms becomes the sensible move: you have months of runway before Easter and the summer, and no competition for the same slot.
Spring 2027
The weeks themselves. Anyone who arranged something directly with a smaller firm is doing the same thing, usually with more responsibility and a named person who remembers them.
Rolling deadlines are the thing to understand
Most large firms assess spring week applications as they arrive rather than all at once at the end. By the closing date a good share of the places are already gone. The practical consequence is uncomfortable but simple: an application you send in October, slightly rough, will usually beat the polished one you send in December. Waiting until you feel ready is the single most expensive habit in this cycle.
Why the numbers are what they are
A spring week exists so a large firm can meet a lot of first years at once. A few hundred places against tens of thousands of applicants, filtered by an online test before a person sees your name. Nothing you write changes that arithmetic. It is worth applying, and it is not worth organising your year around.
The route nobody competes for
A boutique advisory, a regional law firm or a growing agency has no spring week, no portal and no test. They also have no queue. They will often let a keen first year spend a few days seeing how the work is done, because it costs them almost nothing and might turn into a summer hire. You end up with the same thing on your CV: real, named experience at a real firm, usually with more to talk about afterwards than the students who sat in a room of three hundred.
This is worth starting in parallel with your applications rather than after the rejections, because it runs on a different clock. There is no deadline to miss. How to cold email for a spring week covers what to say and when to send it.
What to do this week
Get the CV to a state you would send today, even if it is not perfect. Pick two or three sectors rather than all of them. Write down twenty smaller firms near you that you would actually want to spend a week with. Then apply to the big schemes as they open, and start writing to the small ones now, because nobody else is.