How many weeks does it take to train for a marathon?

Most runners need 16 to 20 weeks to train for a marathon. Stride builds plans of at least 4 weeks, but a first-time marathoner already running a modest base is best served by a full 16-week block: roughly 10 weeks of building mileage, 3 weeks holding peak volume, and a 3-week taper.

How many miles per week should I run for a marathon?

It depends on your goal time and experience. A sub-3:30 marathon typically calls for peaking around 34 miles per week, a 4:00–4:30 finish around 25 miles per week, and a 6:00-plus finish around 20 miles per week. Stride caps weekly growth so you never increase more than about 50% above your current volume.

How long should my longest run be before a marathon?

Long runs for the marathon are capped at 22 miles in Stride and typically peak between 18 and 22 miles depending on experience. The longest run should fall two to three weeks before race day, before the taper begins.

Marathon Training Guide: How to Train for 26.2 Miles

Q: How long is the marathon taper?

The marathon taper is three weeks. Volume drops to about 80% of peak three weeks out, 60% two weeks out, and 40% during race week, keeping some intensity while shedding fatigue.

The marathon rewards patience. Unlike shorter races, where a few sharp workouts can carry you through, 26.2 miles demands months of consistent aerobic development, a long run that stretches well past two hours, and a taper that leaves you fresh on race day. This guide walks through how to structure a marathon build from your current fitness to the start line — the same methodology Stride uses to generate your plan.

How long to train for a marathon

Most runners need 16 to 20 weeks of focused training on top of an existing running base. A well-structured 16-week block breaks down into roughly three phases:

Build (~10 weeks): weekly mileage climbs gradually, with recovery weeks to absorb the load.
Peak hold (~3 weeks): you hold your highest sustainable volume and run your longest long runs.
Taper (3 weeks): volume comes down so you arrive rested without losing sharpness.

If you are starting from little or no running, spend a few months building a consistent base of three to four easy runs per week before beginning a dedicated marathon plan.

How much weekly mileage you need

Weekly mileage is the single biggest predictor of marathon performance, and the right target depends on your goal time and experience. As a rough guide:

Sub-3:30 marathon: peak around 34 miles per week
4:00–4:30 marathon: peak around 25 miles per week
5:00–5:30 marathon: peak around 22 miles per week
6:00-plus marathon: peak around 20 miles per week

Faster goals (sub-2:30) can require 70–75 miles per week. Whatever your target, the golden rule is progression, not shock: increase volume by no more than about 10% per week (7% if you are newer to running, 5% if you are injury-prone), and never jump more than roughly 50% above your current weekly mileage. Recovery weeks that cut volume by 25% every few weeks let your body adapt.

The long run

The long run is the cornerstone of marathon training. It trains your body to burn fat efficiently, strengthens connective tissue, and rehearses the mental demands of time on your feet. In a Stride plan, marathon long runs make up 40–50% of weekly volume and are capped at 22 miles.

Build the long run progressively rather than all at once, and schedule your longest effort two to three weeks before race day — before the taper begins. Run the bulk of it at an easy, conversational pace; later in the plan, adding segments at goal marathon pace teaches your legs what race effort feels like on tired muscles.

Quality sessions and pacing

Beyond easy mileage and the long run, marathon plans include quality sessions that shift focus as you progress:

Build phase: base-building work such as hills, fartlek, and steady-state runs.
Peak phase: the most race-specific sessions — marathon-pace and goal-pace workouts — that sharpen fitness for the demands of 26.2 miles.

Stride calculates your training paces from your current fitness using the VDOT system (from Jack Daniels' Running Formula) and updates them as your fitness improves through the plan, so easy, tempo, threshold, and interval paces stay appropriate week to week.

The taper

The marathon taper lasts three weeks. Volume drops to about 80% of peak three weeks out, 60% two weeks out, and 40% during race week. You keep some intensity to stay sharp but sharply reduce total volume so accumulated fatigue clears and you toe the line fresh. Resist the urge to cram — fitness is already banked, and the taper is where it is realized.

Common marathon training mistakes

Ramping mileage too fast. Big weekly jumps are the fastest route to injury. Respect the growth caps and recovery weeks.
Running easy days too hard. Easy runs should be genuinely easy so quality sessions can be quality.
Neglecting the taper. Trimming the taper to squeeze in extra work almost always backfires.
Skipping nutrition practice. Rehearse race-day fueling and hydration on your long runs, not for the first time on race morning.

Build your marathon plan

Stride turns these principles into a concrete, week-by-week schedule tailored to your goal time, current mileage, experience, and available training days. Create your marathon training plan to get started, or read the half marathon guide and 5K guide for shorter distances.