Marathon Race Training Plan: 16 Weeks, Built Backwards

A marathon race training plan for most runners is 16 to 20 weeks of four or five runs a week: one long run that grows to around 30 km (about 18–20 miles), one quality session at or near goal pace, easy running in between, a lighter week every third or fourth week, and a two- to three-week taper. If you are reading this in November, the useful question is not which plan but which Monday — a 16-week block that starts on 16 November 2026 ends on Sunday 7 March 2027.

Everything else in this article follows from that date. Pick the race, count back, and then decide what goes into each week.

What a marathon plan has to contain

Published plans look different on the page, but strip away the formatting and the same five parts show up. Hal Higdon's beginner programme, for example, uses four running days a week and opens with a 6-mile long run, while the Boston Athletic Association publishes four levels of plans, from runners finishing over five hours to those aiming under three. Different volumes, same skeleton.

The long run

This is the session the rest of the week is built around. It grows by one or two kilometres most weeks, drops back in cutback weeks, and peaks roughly three to four weeks before race day. Its job is time on feet at an easy, conversational effort — not a dress rehearsal at goal pace every weekend.

Easy running

Easy runs fill the gaps between hard days. They are where a four-day plan differs most from a six-day plan: the fewer days you run, the larger each long run looms in the week (the numbers are further down).

One quality session

Usually a tempo run, intervals, or a block at marathon pace inside a medium-long run. One per week is enough for most first- and second-time marathoners. Two quality days plus a long run is a three-hard-days week, which is where many self-built plans break.

Cutback weeks

A week at roughly 75–80 % of the previous week's volume, every third or fourth week. It looks like lost training on a spreadsheet. In practice it is the week where the previous block gets absorbed — and the week you can move to absorb a cold, a work trip or Christmas.

The taper

The last two to three weeks, with volume falling and some intensity kept. Runners who feel sluggish in taper and add a "test" long run are making the most common late mistake in the whole block.

12, 16, 18 or 20 weeks: how to choose

Runner's World puts the range at 12 to 20 weeks, with most plans running 16 to 20. The length is less about ambition than about where you start.

Decision rule: if your current long run is less than a third of your planned peak long run, add four weeks rather than steepening the build.

Counting back from a spring 2027 race

Most runners searching for a plan in November are aiming at a March or April marathon. The table below counts back from four spring Sundays to the Monday your week 1 begins. Check your own race's official date on its website before you commit; these are example Sundays, not race listings.

The arithmetic: race Sunday minus 111 days gives the 16-week start Monday, minus 125 days the 18-week start, minus 139 days the 20-week start. If you are already past the start date, do not try to "catch up" by compressing weeks 1–4 — start at week 1 and drop to the next shorter plan length instead.

Where the holidays land

The week of 21–27 December 2026 sits at a different point in each plan, and that matters more than most plans admit:

• 7 March race, 16 weeks: Christmas falls in week 6 — a build week with a 20 km long run.
• 21 March race, 16 weeks: week 4 — the first cutback week. Ideal.
• 4 April race, 16 weeks: week 2 — low volume, easy to protect.
• 18 April race, 16 weeks: the plan starts the day after Boxing Day.

If Christmas lands on a build week, swap it with the following cutback week. Moving a cutback by one week costs almost nothing; skipping a long run in week 6 and doubling up in week 7 is how calf and Achilles complaints start.

A 16-week marathon training plan, week by week

Here is a four-day structure for a runner currently covering about 30 km a week with a 12 km long run — roughly a 4:00 to 4:30 marathoner. Scale the kilometres up or down by the same percentage if your starting week is different.

MP is marathon pace — the average pace that produces your goal finish time. Tempo means a comfortably hard effort you could hold for around an hour in a race.

The four-day trade-off nobody prints

In week 13, the 30 km long run is 56 % of the 54 km week. That is the price of running four days: each weekly kilometre has to go somewhere, and most of it goes into Sunday. Add a fifth day of 8 easy kilometres and the same long run becomes 48 % of a 62 km week.

That gap is the clearest reason to choose a five-day plan if your schedule allows it. The long run itself stays the same; it simply stops being the single event your whole week recovers from. If you can only run four days, protect the day after the long run as a full rest day and keep the midweek quality session at least 72 hours before the next long run.

Setting training paces from a realistic goal

Paces in a plan are only as good as the goal time they come from. A goal picked from a wish ("I'd like to break four") produces marathon-pace sessions that are too fast from week 6 onward, and the error compounds every week.

Start from a recent race instead. A half marathon run in the last eight weeks is the most useful input; a 10K is acceptable. Our guide to the marathon pace predictor and how it estimates finish time from recent races covers why those predictions drift and which number to trust. Then convert the goal into a per-km and per-mile pace:

These are exact divisions by 42.195 km and 26.2188 miles, rounded to the nearest second. For other targets, the marathon goal pace calculator does the same conversion.

Re-test at the end of week 8 with a 10K or a half-marathon time trial. If the result supports a goal more than five minutes slower than the one you started with, change the marathon-pace sessions from week 9 on. Changing the goal in week 9 is a plan working; changing it on race morning is a plan that was never checked.

Time on feet versus distance

Plans write long runs in kilometres or miles. Your legs experience them in hours. The same 30 km peak run takes very different amounts of time:

A runner at 7:30 per km is out for an hour longer than one at 5:30 per km for the "same" session. A practical rule: if your peak long run would take longer than about 3 hours 15 minutes, cap it by time and finish wherever the clock stops. The extra kilometres add recovery cost more than they add race-day readiness, and the plan's later weeks depend on you arriving fresh.

Training through November to February

A spring marathon block is a winter block for most of the Northern Hemisphere, and the plan on paper ignores that.

Daylight is the first constraint. Midweek sessions move to early mornings or evenings, which makes the quality session the one most likely to be skipped. Put it on the day with the most predictable schedule, even if that means Tuesday instead of the Wednesday the plan prints.

Ice and snow change the long run, not the week. If a Sunday is unrunnable outdoors, split the long run across Saturday and Sunday, or move it to a treadmill and accept that the pace display will not match what your watch shows outside. Do not add the missed distance to the following week.

Cold-weather long runs also hide how much you are sweating and how little you feel like eating. That makes winter the right season to practise fuelling, because race day in March or April may be warmer than anything you trained in.

Fuelling is part of the plan, not race-day admin

The Brooks 12-week plan suggests starting to take in calories around the 45-minute mark of each hour, at roughly 30 to 90 grams of carbohydrate per hour. That range is wide on purpose: what your gut tolerates is individual, and it can be trained.

Use the long runs from week 9 onward to test exactly what you will use in the race — same gels or drinks, same intervals. If something causes trouble at 26 km in February, you have six weeks to change it. Our marathon nutrition guide lays out how pre-race, during-race and recovery intake fit together.

What usually goes wrong

Three failure modes account for most derailed blocks, and each shows up early if you look for it.

Racing the long runs. The first sign is a long run that ends faster than it started, every week. The cost shows up two weeks later as a flat quality session. Fix: run the first two-thirds deliberately slower than feels necessary.

Stacking missed sessions. A week of illness gets "made up" by adding its kilometres to the next two weeks. Fix: repeat the week you missed, or skip it entirely and continue with the plan — never both continue and catch up.

Choosing a plan for the runner you want to be. A 70 km peak week chosen by someone currently running 25 km leaves no room for anything going wrong between November and March, and something usually does. If the first three weeks already feel like peak weeks, drop to a lower level now, not in week 10.

From plan to race day

The last block of the plan is where training turns into execution. By week 14 you should know your realistic goal pace, your fuelling routine and how the course profile will bend your splits. Put those on paper: our article on a race-day pacing plan printable and what belongs on the page covers cumulative checkpoints, fuel triggers and a fallback row for when the day goes sideways.

If your target race is hilly or likely to be warm, adjust the plan's marathon-pace sessions in weeks 9–14 for that course rather than practising a flat-course pace you will not run.

FAQ

How long does it realistically take to train for a marathon?

For a runner already running three or four times a week, 16 to 20 weeks is realistic. Someone with a recent half marathon and a long run of 16 km or more can manage 12 to 14 weeks. Starting from little or no regular running, add a base-building phase of six weeks or more before the plan begins.

What is the 10-10-10 rule for marathons?

It is a pacing approach, not a training plan: run the first 10 miles with restraint, slightly slower than goal pace, the next 10 miles at goal pace, and the final 10 km with whatever you have left. It suits runners who tend to start too fast. You can rehearse it in the long runs from week 9 onward by running the last third at marathon pace.

Is over $300 typical to run a marathon?

It depends on the race and what you count. Entry fees vary widely between local and major city marathons, and travel, accommodation, shoes and fuel can cost more than the entry itself. Check the official registration page of your chosen race for its current fee and budget the travel separately.

What is the 5 4 3 2 1 running method?

The name is used for more than one workout. The version most often meant is a descending interval session — 5, 4, 3, 2 and 1 minutes of hard running with short recoveries, often getting faster as the efforts get shorter. In a marathon plan it fits the single weekly quality slot during the base and build phases, not as an extra hard day.