Training Plan Guide
Half Marathon Training Plan
13.1 miles is the most beginner-friendly long race there is — if the plan fits your life. Here's how to pick a plan length, what each week should look like, and the mistakes that end most first attempts.
A half marathon sits in a sweet spot: long enough to demand real training, short enough that a normal person with a job can prepare for one. Most first-timers need somewhere between 12 and 20 weeks, running three or four days a week. The plan below is the shape that works — the exact miles matter less than showing up for the long run, week after week.
If you've never trained for anything before, start with how to start running to build the habit first. Already eyeing the full distance? Our marathon training plan picks up where this one leaves off.
How long does it take to train for a half marathon?
The honest answer: it depends on your starting line, not your ambition. Here's how to place yourself:
- From zero running: 20–24 weeks. You need a base-building phase before real half-marathon training starts — mostly easy miles and run-walk. Rushing this phase is how most first-timer injuries happen.
- Can run 30 minutes nonstop: 12–16 weeks. This is the standard first-timer window. You have enough base that the plan can focus on the long run progression.
- Run regularly already: 8–12 weeks. If you're running 15+ miles a week comfortably, you mostly need the long-run ladder and one workout a week.
When you're between two options, take the longer plan. Nobody ever regretted arriving at the start line healthy with fitness to spare.
Pick your plan length: 12, 16, or 20 weeks
12 weeks
You can already run 30–45 minutes without stopping.
3–4 runs per week. Long run builds from 6 miles to 10–11.
The classic first-timer plan. Tight but doable if the base is there.
16 weeks
You run occasionally but not consistently.
3–4 runs per week with a gentler ramp. Two down weeks built in.
The safest pick for most beginners. Room for a bad week or two.
20 weeks
You're starting from very little running.
Starts with run-walk. Long run builds from 3 miles to 10–11.
Couch-to-half-marathon territory. Slow ramp, low injury risk.
What a training week actually looks like
Every half-marathon plan is some arrangement of the same four ingredients. Learn the ingredients and any plan becomes readable:
Easy runs
The bulk of your training. Conversational pace — you should be able to talk in full sentences. These build your aerobic base without beating you up.
The long run
One per week, usually the weekend. This is the workout the whole plan is organized around: it teaches your body to keep going for hours.
One workout
A tempo run, intervals, or hills — one quality session a week once you have a base. This is what makes you faster, not just fitter.
Rest and cross-training
At least one full rest day. Easy cross-training — cycling, swimming, walking — on another day if you want more volume without more impact.
Most of your miles should feel easy — that's not a beginner concession, it's how endurance is built. Our zone 2 training guide explains why the slow miles do the heavy lifting.
A sample week, at three points in the plan
Here's the shape of a 12-week beginner plan. The pattern stays the same; only the doses change.
| Week | Easy runs | Workout | Long run |
|---|---|---|---|
| Week 1 (12-week plan) | 2 × 3 miles easy | None yet — just miles | 6 miles, comfortable |
| Week 6 | 2 × 4–5 miles easy | 20-min tempo | 9 miles, last 2 steady |
| Peak (week 10) | 2 × 5 miles easy | 6 × 3 min fast / 2 min jog | 11 miles, practice fueling |
How fast should you run?
Beginners almost always run their easy days too hard and their hard days too easy. Fix it with two rules: easy runs at conversational pace (full sentences, no gasping — usually 1:30 to 2:30 per mile slower than goal race pace), and workouts genuinely uncomfortable but controlled.
Don't have a goal pace yet? Plug a recent race or time trial into the race pace calculator to get training paces, or use the heart rate zone calculator if you train by heart rate. Race-day pacing strategy — even splits, when to push, when to hold — lives in our race pacing guide.
The long run is the whole plan
If you only do one thing right, make it the weekly long run. It builds the specific endurance the half demands: glycogen storage, fat utilization, and the mental proof that you can keep going. Build it gradually — most plans add about a mile a week, with a cutback week every third or fourth week where the long run drops back down.
Once long runs pass 75 minutes, start practicing race-day fueling: 30 to 60 grams of carbs per hour from gels, chews, or sports drink. Your stomach needs training too, and the only dress rehearsal is the long run. Peak with a 10 to 12-miler about three weeks out, then let the taper do its work.
Mistakes that derail first-timers
Ramping mileage too fast
The 10%-per-week rule is a guideline, not a law — but doubling your long run because you felt good is how most first-timers get injured. Boring progression wins.
Running the long run too hard
The long run should feel almost too easy for the first half. If you're racing it, you're not building endurance — you're just accumulating fatigue that wrecks the next week.
Skipping rest days
Fitness is built during recovery, not during the run. The runners who skip rest days don't get fitter faster; they get injured, often right when the mileage starts to feel like it's working.
Nothing new on race day
Shoes, gels, breakfast, socks — race day is the worst time to experiment. Everything you use in the race should have survived at least one long run already.
Half marathon training FAQ
How long does it take to train for a half marathon?
It depends on where you're starting. From zero running, give yourself 20 to 24 weeks. If you can already run 30 minutes without stopping, 12 to 16 weeks is the standard. Regular runners with a base can be ready in 8 to 12. When in doubt, take the longer plan — arriving healthy beats arriving fast.
Can a beginner run a half marathon?
Yes — the half marathon is the most beginner-friendly long race. You don't need to be fast and you don't need a running background; you need consistent weeks. Many first-timers finish between 2:00 and 2:45, and plenty walk parts of it. Finishing healthy is the goal the first time.
How many days a week should I run?
Three to four days is enough for a first half marathon. One long run, one workout (once you have a base), and one or two easy runs, with rest or cross-training between. More days help, but consistency across weeks matters far more than cramming days into one week.
Do I need to run 13.1 miles in training?
No. Most beginner plans peak with a long run of 10 to 12 miles. The taper, race-day adrenaline, and crowds carry you through the last few miles. Running the full distance in training just adds injury risk for no real benefit.
What pace should I run my easy runs?
Slow enough to hold a conversation — for most beginners that's 1:30 to 2:30 per mile slower than goal race pace. If you're gasping, you're not running easy. Easy pace feels almost embarrassingly slow, and that's correct.
Can I walk during a half marathon?
Absolutely. Planned walk breaks — especially at aid stations — are a legitimate race strategy, and many runners finish faster with them than by running until they blow up. If your plan used run-walk in training, race the same way.
What should I eat before a long run?
Eat a familiar, carbohydrate-heavy meal 2 to 3 hours before — oatmeal, toast, a banana, whatever your stomach already trusts. On runs over about 75 minutes, practice taking in 30 to 60 grams of carbs per hour with gels, chews, or sports drink, exactly as you plan to on race day.
When should I start tapering?
For a half marathon, ease off in the final 7 to 10 days: keep running, just shorter, with the last real workout about 10 days out. The full taper playbook — what to cut, what to keep, and why you'll feel strangely terrible — is in our race taper guide.
Want the plan built around your life?
Static plans assume every week goes perfectly. Coach Icarus adjusts yours when work explodes, you get sick, or a workout goes sideways — so one bad week doesn't sink the plan.
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