Running Your First London Marathon: A Beginner's Guide

How should a beginner approach their first London Marathon?

If the London Marathon is your first marathon, the keys are to train consistently for four to six months, build your long run up gradually, start the race slower than feels natural and pace yourself evenly, and soak up the famous crowd support. Most first-timers finish somewhere between four and six hours, and finishing is the goal, not a fast time.

It helps to set your expectations early. A first marathon is a big, rewarding day, and it is completely normal to feel a mix of excitement and nerves in the weeks beforehand. You do not need to be fast, and you do not need a fancy watch or the newest trainers. What matters most is turning up on the start line healthy, having done the training, with a simple plan you trust.

London is a wonderful place to run 26.2 miles for the first time. The course from Greenwich to Westminster is famously flat and fast, and the crowds line almost the entire route. That support is one of the biggest reasons first-timers love the day, and leaning into it will carry you through the harder miles. The 2027 event is the biggest ever, spread across two days on Saturday 24 and Sunday 25 April, so you will be sharing the streets with a huge, friendly field of runners.

How long should you train for your first marathon?

For most beginners, four to six months of consistent training is a comfortable window. That gives you time to build up gently, absorb the odd missed session or busy week, and reach the start line feeling prepared rather than rushed. If you are already running a few times a week, the shorter end of that range can work. If you are newer to running, give yourself the fuller six months so the build stays kind to your body.

The heart of marathon training is the weekly long run, and the golden rule is to build it up gradually. Add distance in small steps rather than big jumps, and keep the pace easy and conversational. Your long runs teach your legs and your mind to keep going, and they are where you rehearse your fuelling and your kit. Many plans peak at a long run somewhere below the full distance, which is completely normal, and the extra miles on race day come from your training, your taper and the crowds.

Around the long run, a good beginner week usually mixes a few easy runs with some gentle strength and mobility work to keep you resilient. Rest days matter just as much as running days. If you pick up a niggle, an ache or any pain that does not settle, ease off and check in with a qualified professional rather than pushing through. Consistency over the months, not any single heroic session, is what gets you to the start line ready.

How should you pace your first marathon?

The single best piece of pacing advice for a first marathon is to start slower than feels natural. On the day, the adrenaline, the crowds and the sea of runners around you will tempt you to set off quickly. Resist it. Those early miles feel easy no matter how fast you go, and the pace you bank in the first hour is often paid back with interest in the closing miles.

Aim to run evenly, holding a steady, comfortable effort you could keep chatting through for the first half. If anything, let the first few miles be a touch slower than your target while the field spreads out and you settle in. Even pacing is how most first-timers have their best day, and it is the surest way to avoid hitting a wall in the final stretch. Remember that most beginners finish somewhere between four and six hours, so give yourself permission to run your own race and ignore the runners flying past early on.

Walk breaks are completely allowed and can be a smart part of a plan, especially through the water stations. There is no shame in walking, and a short, deliberate walk can help you finish stronger than grinding on when your legs are struggling. Whatever your strategy, decide it in training and practise it, so that on the day you are simply running a plan you already trust.

What should you take on race day?

The golden rule for race-day kit is nothing new on the day. Everything you wear, carry and eat should be something you have already tried and trusted in training. Use the checklist below as a simple guide, and always defer to the official London Marathon information for the latest logistics, bag policy and start details.

Keep your fuelling advice general and personal to you. Practise it in training, take on what works for your stomach, and if you have any health condition or specific dietary needs, check with a qualified professional before race day rather than experimenting on the morning itself.

How do you deal with nerves and the wall?

Nerves before a first marathon are completely normal, and a little apprehension usually means you care. The best antidote is preparation. When you have trained consistently for months, practised your fuelling and settled on a pacing plan, you can stand on the start line knowing you have done the work. Break the day into smaller pieces in your mind, focus on the next mile or the next water station, and let the crowds lift you along.

The wall is the term runners use for the tough patch, often in the later miles, when your legs feel heavy and your pace wants to drop. It is far less likely to hit hard if you have started slowly, paced yourself evenly and kept your fuelling steady from early on. If a low patch does arrive, slow down, take on some fuel and fluid, and know that these moments usually pass. A short walk break, a smile at the crowd or a look for a familiar face can be enough to turn things around.

Above all, enjoy it. London gives you crowds cheering your name, bands playing, and thousands of people willing you to the finish. Soak it up, high-five a few children, and remember that crossing the line of your first marathon is a huge achievement whatever the clock says. Finishing is the goal, not a fast time.

Frequently asked questions

How should a beginner approach their first London Marathon?

If the London Marathon is your first marathon, the keys are to train consistently for four to six months, build your long run up gradually, start the race slower than feels natural and pace yourself evenly, and soak up the famous crowd support. Most first-timers finish somewhere between four and six hours, and finishing is the goal, not a fast time.

How long should I train for my first marathon?

For most beginners, four to six months of consistent training works well. Build your weekly long run up gradually, keep most runs easy, and add gentle strength and mobility work. Give yourself the fuller six months if you are newer to running, and rest when you need to.

What is a realistic finish time for a first marathon?

Most first-timers finish somewhere between four and six hours, though times vary a lot from person to person. Treat any time as a rough range rather than a promise. For your first marathon, the aim is simply to finish, enjoy the day and cross the line feeling proud.

When is the 2027 London Marathon?

The 2027 TCS London Marathon is a two-day event on Saturday 24 and Sunday 25 April 2027, the biggest ever. The course runs from Greenwich to Westminster and is famously flat, fast and well supported by crowds. Always check the official site for the latest details and logistics.

How do I avoid hitting the wall?

Start slower than feels natural, pace yourself evenly, and take on fuel and fluids steadily from early in the race rather than waiting until you feel low. Practise your fuelling in training so nothing is new on the day. If a tough patch arrives, slow down, take on fuel, and know it usually passes.