How to taper for a marathon
How to taper for a marathon: start three weeks before the race, right after your longest run, and cut weekly volume by roughly 20 to 30 percent each week while keeping a little speed. This page shows the three weeks, the mileage and the mistakes to avoid. The generator builds a three-week taper into every marathon plan.
How to taper for a marathon, week by week
The taper removes fatigue without removing fitness. Fitness takes weeks to lose; fatigue clears in days, so the trade is in your favor. Volume goes down, the long run shrinks fastest, and a few short faster pieces stay in so the legs remember the pace.
| Weeks before the race | Weekly volume | Long run | Faster running |
|---|---|---|---|
| 3 weeks out | Cut 20 to 30 percent from peak | 12 to 14 miles | One short tempo, 3 to 4 miles at tempo pace |
| 2 weeks out | Cut another 20 to 30 percent | 8 to 10 miles | A few miles at goal pace inside an easy run |
| Race week | About half of peak or less | None; 3 to 4 easy miles midweek | Strides only, 2 days out, then rest or a 2-mile shakeout |
In the generator the taper is the last three weeks of every marathon plan. For a 16-week plan built from 25 miles a week and a 10-mile long run, the weeks go 35, 26, 21 and 16 miles from the last peak week to race week, and the long run falls from 20 miles to about 14, 9 and 5.
Build your free marathon plan
Same engine as every plan on this site, but with your race date, your run days and your longest recent run. Prints to PDF, exports to your calendar. No signup.
When to taper for a marathon
Three weeks out, the day after your longest run. That timing is not arbitrary: the last 18 to 20 mile run needs about three weeks to turn into race-day strength, and a 16 to 20 week plan has been building fatigue the whole time. Runners on lower mileage, say under 30 miles a week, can taper for two weeks instead, because there is less fatigue to shed.
A 10-day taper is a half marathon approach. For the marathon it leaves the longest run too close to the race, and tired legs on the start line cost more than the extra miles ever gave.
Marathon taper mileage: cut volume, keep intensity
The classic taper mistake is cutting everything. Remove miles, not pace. Keep one short tempo in the first taper week, a handful of goal-pace miles in the second, and strides in race week. In the generator the tempo pace sits 20 seconds per mile under race pace, so a tempo session during the taper is not a hard day. Do not add new workouts, new shoes or a new stretching routine; the taper is for things you have already done.
Keep the number of run days the same and shorten each run. Four short runs a week keep the rhythm better than two longer ones with extra rest days.
Marathon taper fatigue and phantom pains
Expect to feel worse before you feel better. Heavy legs, restless sleep, odd aches that move from knee to hip, a scale that reads two or three pounds higher: all normal. The weight is stored carbohydrate and the water that comes with it, which is exactly what you want on the start line. The aches are the body repairing weeks of work now that it has the chance.
Do not test your fitness. A fast five miles to see whether the plan worked undoes a week of taper. Trust the long runs you already logged; they are in the 16-week plan table if you want to count them.
Rest days before a marathon
Two days out, rest completely or walk. The day before, a 2-mile shakeout with four strides, or nothing if you prefer. Sleep matters most two nights before the race, since race-eve sleep is usually poor and does little harm. For what happens next, read the race day guide and the fueling guide, and check your splits on the marathon pace chart.
Marathon taper research: the numbers and the sources
What two large studies measured, next to what the generator does. Sources checked on October 28, 2026.
| Finding | Number | Source |
|---|---|---|
| Recreational marathoners whose taper data was analyzed | More than 158,000 runners, Strava training logs | Smyth and Lawlor, Frontiers in Sports and Active Living, 2021 |
| Strict 3-week taper compared with a minimal taper | Median finish 5 min 32 s faster, about 2.6 percent | Smyth and Lawlor, 2021 |
| Strict tapers (volume falls every week) against relaxed ones | Strict tapers were linked to faster finishes; tapers up to 3 weeks beat shorter ones | Smyth and Lawlor, 2021 |
| Most effective taper across 27 studies of competitive athletes | About 2 weeks, training volume cut by 41 to 60 percent | Bosquet et al., Medicine and Science in Sports and Exercise, 2007 |
| Intensity and frequency during that taper | Kept the same; only volume came down | Bosquet et al., 2007 |
| This site's marathon taper | 3 weeks at about 75, 60 and 45 percent of the peak week | RunMarathon plan engine |
Frequently asked questions
How long before a marathon should you taper?
Three weeks, starting right after your longest run. Two weeks is enough for runners on low mileage.
Can you taper too much for a marathon?
Yes. Cutting all speed, dropping run days or resting a full week leaves the legs flat. Cut miles, keep a short tempo and strides, and run short every other day.
How important is tapering before a marathon?
It is the difference between racing on fresh legs and racing on the fatigue of 16 weeks. The fitness is already built; the taper lets you use it.
How many rest days before a marathon?
One full rest day two days before the race, then an optional 2-mile shakeout the day before. More than two days without running makes the legs feel stale.
Is a 10-day marathon taper enough?
Only for experienced runners on moderate mileage. Most runners do better with two to three weeks.
How much faster does a taper make you in a marathon?
In Strava data from more than 158,000 recreational runners, a strict 3-week taper was linked to a median finish 5 minutes 32 seconds faster, about 2.6 percent, than a minimal taper (Smyth and Lawlor, 2021).
How much should mileage drop during a marathon taper?
A 2007 meta-analysis of 27 studies found the best results when volume fell by 41 to 60 percent over about two weeks, with pace and run days unchanged (Bosquet et al.). The generator's three weeks at 75, 60 and 45 percent of the peak land in that range by race week.
Is a one-week marathon taper too short?
For most runners, yes. In the 2021 Strava study a one-week taper was associated with slower finishes than every longer taper, and only no taper at all did worse.