Looking for an ultimate guide to upcoming marathons in London across 2026 and 2027? Start with the big one: the TCS London Marathon. For the 2026 cycle, the ballot is scheduled to open on the day of that year’s event, Sunday 27 April 2025, with results announced later in the year. For 2027, it becomes a two-day “Double” on Saturday 24 April and Sunday 25 April, with elite women racing on one day and elite men on the other, plus 100,000 participants across both days.
If you want more than a single race on your calendar, London-area 26.2-mile options are also building momentum. Consider the Thames Meander Summer (26.2 miles trail along the Thames towpath on Sun 9 Aug), the Richmond Marathon (26.2 miles road on Sun 13 Sep), the Thames Meander Autumn (26.2 miles trail along the Thames towpath on Sun 4 Oct), and the Richmond Park Full Marathon (26.2 miles trail on Sun 28 Jun). For runners craving a longer challenge, the SITC Summer Samosa Ultra (42.2 km road on Sun 23 Aug) is a strong alternative.
This guide will help you map the right event for your goals, understand what makes each course different, and plan around key dates so you can train with confidence. Use the details here to shortlist races, watch for entry windows, and get your logistics sorted early, because the best London marathon plans are the ones made before race day arrives.
What Changes for the London Marathon in 2026 and 2027
The London Marathon is already famous for its atmosphere, but the next two editions bring a practical twist. The cycle event starts at Blackheath and finishes at The Mall at Buckingham Palace, and the schedule is being shaped to fit a larger participation plan in 2027.
For 2026, entries follow the usual ballot approach, while 2027 shifts into a two-day “Double” setup. That means elite women typically race on one day and elite men plus the main field race on the other, all within Saturday 24 April and Sunday 25 April.
If you are planning from scratch, treat 2026 as your preparation year and 2027 as your season centerpiece. The key is booking travel and training blocks early, because the dates and entry expectations will feel different when the event spans two days with roughly 100,000 participants across both.
How the 2026 Ballot Timing Affects Your Entry Plan
Ballot timing changes how you pace your decisions. For the 2026 entries, the ballot is scheduled to open on the day of that year’s event, which falls on Sunday 27 April 2025, with results announced later in the year.
That schedule means you should decide your training commitment before you know your race outcome. Many runners handle this by locking a base plan first, then adjusting intensity once results are confirmed.
When you plan your entry, also check whether you want a backup option in the same season. If the marathon ballot does not go your way, a nearby 26.2 mile race in London can keep your momentum moving.
Start Waves and Timing for Elite and Main Fields
Race morning can feel chaotic, but the start structure makes it manageable. The elite wheelchair and elite women often begin earlier, while elite men and the main field start later to keep the course flowing smoothly.
From a pacing standpoint, your best move is to decide where you will be during the first hour, not just your own start time. Even if you are not racing elites, watching the early waves can help you gauge crowd density, road readiness, and how quickly the atmosphere ramps up.
If you are supporting someone, plan viewing spots around landmarks rather than chasing runners. Along the Blackheath to The Mall corridor, the crowd pattern changes fast, and having a fixed plan saves time and stress.
How to Use the London Route to Shape Your Training Pacing
The Blackheath to Buckingham Palace route is both iconic and demanding because it rewards even pacing and punishes sloppy surges. You can treat the course like a template for how you want your effort to feel for 26.2 miles.
During training, practice controlled long runs where your goal is rhythm, not heroics. Add a few sessions that mimic race-day tempo, then finish them with a calm last stretch so you learn what “steady” really feels like when fatigue starts.
Also pay attention to how you handle distractions. London’s crowds, signage, and street changes can make you subconsciously speed up, so build a skill of re-centering your effort at regular points in your run.
Thames Meander Summer as a Scenic Trail Option
If the idea of road traffic is not for you, the Thames Meander Summer offers a refreshing change. It is a 26.2 mile trail run along the Thames towpath on Sun 9 Aug, with around 600 ft of ascent.
Trail training is not just about strength, it is also about control. Shorter steps, quicker foot placement, and better balance help you move efficiently when the ground is uneven.
This race suits runners who want a springboard for later marathon training. It gives you a long-distance focus while staying different enough from pure road pounding.
Richmond Marathon on Roads with Noticeable Climb
The Richmond Marathon keeps the long-distance format but swaps the surface for roads. It takes place on Sun 13 Sep and includes about 160 m of ascent, which can matter more than you expect when you are already tired.
For pacing, plan your effort around the climbs. On road routes with elevation, runners often go too hard early because the flats feel “safe.” A better approach is to keep the early effort conservative, then test your strength later when you still have enough form to respond.
If you are training for the London Marathon, this kind of race is a useful rehearsal for sustaining your stride over changing terrain without losing economy.
Thames Meander Autumn for Long-Run Confidence
The Thames Meander Autumn is another towpath-based choice, again at 26.2 miles on Sun 4 Oct. Expect around 600 ft of ascent, and expect the conditions to feel cooler and sometimes less predictable than summer.
Autumn races are great for building confidence because they reward steady decision-making. You will need to manage your clothing, your hydration pace, and your motivation when the novelty of the scenery fades.
Use this race as a confidence check for your ability to keep going even when your legs feel less springy. If your technique stays clean through fatigue, you will carry that advantage into later marathon blocks.
Richmond Park Full Marathon for Familiar Terrain and Focused Laps
The Richmond Park Full Marathon is listed as a 26.2 mile trail on Sun 28 Jun. Trail running in the park can feel both less chaotic and more mentally demanding, because you tend to stay in a consistent environment for longer.
That makes it useful for practicing mental pacing. Plan landmarks or time-based markers rather than waiting for the next dramatic moment. When the terrain is familiar, your mind needs structure to stay engaged.
If you want a race that helps you feel “ready” without chasing speed, a trail loop style can be a strong fit. It also gives your body variety when road training has been heavy.
SITC Summer Samosa Ultra for Those Who Want a Bigger Challenge
For runners who want distance beyond the classic marathon, the SITC Summer Samosa Ultra offers a 42.2 km road challenge on Sun 23 Aug. That extra distance changes everything, from fuel timing to how often you walk through minor discomfort.
Approach ultras with humility. Your goal is to finish strong, not to match road marathon pacing, because 42.2 km demands a different relationship with effort.
This option can work well as a “season stretch” race. It can teach you pacing discipline and hydration habits that translate back to 26.2 miles later.
Choosing Which London-Area Marathon Fits Your Current Fitness
Not every 26.2 mile race helps you in the same way, so start by matching the event to your training stage. Consider whether you need road speed practice, trail balance work, or simply a long-distance test under different conditions.
The following quick comparison makes it easier to choose based on date, distance, and surface style.
| Event | Date | Route Style |
|---|---|---|
| Thames Meander Summer | Sun 9 Aug | Trail towpath |
| Richmond Marathon | Sun 13 Sep | Road |
| Thames Meander Autumn | Sun 4 Oct | Trail towpath |
| Richmond Park Full Marathon | Sun 28 Jun | Trail |
| SITC Summer Samosa Ultra | Sun 23 Aug | Road ultra |
Once you pick, treat that race as a training tool. You can still race it with ambition, but keep your plan aligned with what you need next, not just what sounds exciting.
Build a 16 Week Base Plan for 2026 and a 20 Week Plan for 2027
Training length matters because London’s big goals deserve gradual preparation. A solid approach is a 16 week base when you already have regular running behind you, then a longer 20 week build if you are moving up in distance, adding hills, or returning from a break.
Use long runs to anchor your schedule, and add one session each week that trains your ability to hold effort when your legs feel heavy. If your plan has hills, keep them controlled. If it has tempo, focus on form and smooth cadence rather than chasing fast splits.
As races stack up across summer and autumn, pay attention to recovery days. It is often better to keep one week slightly easier than to cut it too close and lose quality in the next block.
Race Week Habits That Reduce Stress in London
Race week is where small routines create big calm. Keep your travel plan simple, then reduce decision-making by choosing your kit the day before. In busy parts of London, last-minute shopping or outfit changes can turn a plan into a scramble.
If you are staying nearby, pre-select where you will walk on race morning. Aim for a route that is well lit, not too far from transport, and easy to repeat so you learn the feel of the area without surprises.
On the day before, do a short shakeout and avoid anything that feels “new.” Your goal is to arrive with legs that feel ready, not legs that feel tested.
Plan Travel and Timing Around the Two-Day 2027 Weekend
With the marathon held as a two-day Double in 2027, the city logistics will shift. Accommodation demand, transport crowding, and viewing access can vary significantly between Saturday and Sunday.
For the most reliable official marathon dates, check updates regularly and build your travel around the day you are actually targeting.
Once you know your race day, book flexible check-in or travel buffers where possible. Even an extra hour of cushion can prevent delays from turning into missed warm-ups.
Hydration and Nutrition for Long Runs Near the Thames and Parks
Long routes along the Thames and through parks can feel easier than dense city streets, but fueling still needs precision. You can get carried away by scenery and forget that you are spending hours in motion.
Make a simple fueling schedule, then practice it on training days. Many runners do best with consistent intake every 20 to 30 minutes, adjusted for temperature and how your stomach responds.
If you are doing trail sections, remember that hydration is tied to foot placement. You want to drink without breaking form too abruptly, so practice how and when you take fluids rather than experimenting on race day.
Race Day Fueling for 26.2 Miles and Beyond
For 26.2 mile races, you typically need enough carbs to keep your pace stable through the later miles. The most common mistake is “waiting until you feel hungry,” which often comes too late.
Consider a plan that includes carbs from gels or drinks early, then repeats steadily. If you are doing an ultra like the 42.2 km road challenge, you will need a more frequent and more flexible approach, including water and electrolytes.
Keep it boring on race day. If you trained with specific products, stick to them. When you switch brands or flavors last minute, your stomach may not cooperate.
Support Systems That Keep You Consistent Between Races
The best marathon seasons are supported by routines, not just motivation. A running group, a coach, or even a consistent friend can help you stay accountable through the week.
For London-area events, you can also use local support in a practical way. Friends can meet you at landmarks for reassurance, and they can help you stick to your fueling plan by reminding you at set intervals.
If you are training for ultimate goals in 2027, build support early rather than in the last few weeks. Consistency grows when your environment supports your schedule.
Weather and Kit Planning Across June to October
The marathon calendar around London spans a wide seasonal range, including June, August, September, and October. That variety affects hydration needs, clothing comfort, and how your body handles changes in temperature.
Create a kit list based on conditions, not assumptions. For warm days, plan lightweight layers and have a clear plan for water access. For cooler or windy days, prioritize items that protect you from chilling without overheating.
If rain is possible, consider how you will carry essentials and how wet fabric might change your comfort. In long events, kit decisions can be as important as training.
Accessibility and Event Structure for Different Categories
Large events are more than a single start time. In the London Marathon cycle, categories have different waves, which affects pacing, access to viewing, and how organizers manage the course.
For planning, treat the start structure as part of your experience. If you are supporting elite participants, your viewing plan should reflect the earlier start windows for elite wheelchair and elite women, then the later start for elite men and the main field.
Understanding how the event is organized helps everyone feel more prepared, whether you are racing, volunteering, or cheering from the roadside.
Track Your Progress and Recover Like You Mean It
After any long London-area race, your next week matters as much as the finish line. Recovery is not just rest. It includes sleep, gentle movement, and feeding your body with enough protein and carbs.
Track what changes in your performance. Use notes about perceived effort, soreness patterns, and energy levels during your long runs. Those details can guide your next block more effectively than raw pace alone.
When the season is busy from June through October, recovery planning becomes your competitive advantage. If you keep your body intact, your later races feel easier.
Ultimate Guide 2026 2027 for Upcoming Marathons in Londong
If you are building a plan across multiple dates, the smart move is to choose one main goal and treat the rest as structured training. For many runners, 2027 becomes the focal point because the event is a two-day Double with elite and main fields separated by day.
To put everything into one system, map your year around what you can control: entry timing, travel buffers, and a training block that respects recovery. Then pick London-area races that match your current needs, such as towpath trail work or road mileage with climb.
That is the heart of an ultimate guide 2026 2027 approach to upcoming marathons in londong, where each event earns its place by improving your next performance.
What Upcoming Marathons in London Are Scheduled for 2026 and 2027?
Which London Marathon Dates Should You Expect for the 2026 and 2027 Seasons?
For this cycle, the flagship TCS London Marathon runs on Sunday 27 April 2026, and in 2027 it is staged as a two-day “Double” on Saturday 24 April and Sunday 25 April.
When Is the TCS London Marathon 2027 Held as a Two-Day Double?
In 2027, TCS London Marathon will take place over two days—Saturday 24 April and Sunday 25 April—with elite women racing on one day and elite men on the other, plus a combined field of about 100,000 participants across both days.
How Does the London Marathon Course Run From Blackheath to The Mall at Buckingham Palace?
The race course is run from the iconic Blackheath start through London to The Mall at Buckingham Palace, following the traditional marathon route used for the London Marathon flagship event.
What Start Times Are Typically Used for Elite Wheelchair, Elite Women, Elite Men, and the Main Field?
Typically, elite wheelchair and elite women start at about 8:50am and 9:05am, while elite men and the main field begin from around 9:35am.
When Does the 2026 TCS London Marathon Ballot Open, and When Are Results Announced?
For 2026 entries, the ballot is scheduled to open on the day of the 2025 event (Sunday 27 April 2025), with results announced later in the year.
Which Thames Meander 26.2-Mile Marathons Are Coming Up in London in 2026?
The upcoming Thames Meander options include the Summer Thames Meander (26.2 miles trail along the Thames towpath; Sun 9 Aug; about 600 ft ascent) and the Autumn Thames Meander (26.2 miles trail along the Thames towpath; Sun 4 Oct; about 600 ft ascent).
When Is the Richmond Marathon Scheduled, and What Elevation Should Runners Plan For?
The Richmond Marathon is scheduled for Sun 13 Sep (26.2 miles road), with roughly 160 m of ascent, so pacing and fueling plans should account for the rolling effort implied by that elevation.
What Are the Date and Route Details for the Richmond Park Full Marathon?
The Richmond Park Full Marathon is set for Sun 28 Jun and is a 26.2-mile trail event through Richmond Park, making it a distinct alternative to road marathons for runners who prefer trail surfaces.
Are There Any Longer London-Area Ultra Races Scheduled Beyond the 26.2 Options?
Yes—an example longer-road challenge is the SITC Summer Samosa Ultra (42.2 km road; Sun 23 Aug), which can be a strong goal for runners building up from marathon training.
How Can You Plan Training and Logistics for Upcoming Marathons in London in 2026 and 2027?
Start with the confirmed calendar (London Marathon in late April 2026 and the two-day staging in 2027), then book transport and accommodation early, review course elevation and surface differences for each event, and build a training plan around fueling practice and recovery time before race day.
Get Ready for Your Best Running Season in London Through 2027
If you are mapping training for upcoming marathons in londong, ultimate guide 2026 2027, focus on the TCS London Marathon dates and entry flow, then add proven local 26.2-mile options around it. The flagship race runs from Blackheath to The Mall in 2026, while 2027 is scheduled as a two-day “Double” in late April, and other standout picks nearby include the Thames Meander Summer and Autumn, the Richmond Marathon, and the Richmond Park Full Marathon, plus longer-event variety like the SITC Summer Samosa Ultra for runners who want more than 26.2 miles.