Marathon Training Plan: 16 Weeks to 26.2 Miles
A 16-week marathon training plan covering long runs, tempo work, mileage progression, tapering, and fueling to get you to the finish of 26.2 miles.
May 27, 2026 · 2 min read
A marathon training plan typically lasts 16 weeks and is built around a progressively longer weekly long run that peaks at 18–20 miles, supported by easy mileage, tempo runs, and a three-week taper. The marathon distance is 26.2 miles (42.2 km). Success depends as much on patient mileage and a tested fueling plan as on any single workout.
Are you ready for a marathon?
Before starting a 16-week marathon plan, you should be running consistently and able to cover the distance of a half marathon, or close to it. The marathon is a serious endurance demand; building from too small a base is the most common cause of injury and DNFs.
Weekly structure
- Long run: the cornerstone, increasing gradually with cutback weeks.
- Tempo or marathon-pace run: trains your goal race effort.
- Two to three easy runs to accumulate aerobic volume.
- One rest day and optional strength or cross-training.
Long run progression
- Weeks 1–4: build from ~8 to 12 miles with a cutback week.
- Weeks 5–9: progress to 14–16 miles, alternating up and cutback weeks.
- Weeks 10–13: peak long runs of 18–20 miles, with marathon-pace segments.
- Weeks 14–16: three-week taper, reducing volume into race day.
Why long runs cap at 20 miles
Most plans stop at 18–20 miles because the injury and recovery cost of running 26 in training outweighs the benefit. The taper sharpens you, and race day provides the rest. Trust the plan.
Fueling: train your gut
Running 26.2 miles depletes your glycogen stores, so most marathoners take in 30–60 grams of carbohydrate per hour during the race. Practice this on every long run — your stomach needs training just like your legs. Knowing exactly what and when you'll eat prevents the dreaded wall and mid-race stomach trouble.
Frequently asked questions
How many miles is a marathon?
A marathon is 26.2 miles, or 42.2 kilometers. The distance was standardized in 1921 and traces back to the 1908 London Olympics route.
How long should my longest training run be?
Most plans peak at an 18–20 mile long run about three weeks before race day. Running the full 26.2 in training isn't recommended — the recovery and injury cost outweighs the benefit.
How many days a week should I run for a marathon?
Four to five days a week is typical for recreational marathoners. That balances enough aerobic volume and long-run progression with the recovery needed to stay healthy.
Put it into practice
Let Coach Ben build your plan.
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