12 Week Half Marathon Training Plan

Our 12 Week Half Marathon Training Plan is our most popular training plan for the half marathon event!

12 weeks in ample time for beginner and intermediate runners to get ready for their half marathon; we’ve built this training program with a focus around building your endurance first, without too much concern about speed.

If you have more time to prepare, check out our 16 week half marathon training plan designed for beginners in mind; we’ve also got a host of training plans structured around time-based goals (like running a sub 2-hr half marathon).

This 12 week half marathon training plan is designed to get you to the finish line comfortably while building your training in a structured way to minimize the risk of injury or burnout.

Ready to start your training?

Let’s jump in!

Beginner Half Marathon Training Plan 12 Weeks

Can You Train For a Half Marathon In 12 Weeks?


As long as you have some running ability, it’s entirely possible to get ready to cover 13.1 miles in 12 weeks.

12 weeks is about right for most people; it’s enough time to allow you to gradually increase your mileage without overdoing it.

It’s also not too long a training period that you get fatigued or overtrain – it’s right in the sweet spot.

Our 12 week half marathon training schedule also includes a 2 week half marathon taper: in other words, you do your longest training run 2 weeks before your actual event, then wind down your training somewhat over those final two weeks, so you’re rested and ready when you line up at the start line!

4 Tips For Acing Your 12 Week Half Marathon Training

12 week half marathon training plan

1. Don’t Get Hung Up On Speed

Sure, everyone likes to humblebrag about their HM finishing times, or their comfortable running speed.

But when it comes to attempting a half marathon – especially if it’s your first – it’s wise to forget all about speed, at least as much as possible.


Trying to improve your running speed takes a lot of work, and specific workouts like Interval Training and HIIT-style sprint sessions. These can be a lot of fun, but also take their toll on your body.

When you combine them in with the long runs and increasing mileage of our 12 week half marathon training plan, you’re placing a lot of stress on your body. You’re not only trying to build endurance, but speed at the same time. And you’re massively increasing the risk of suffering from an injury, or burn-out, or exhaustion.

So my main advice for beginner half marathon runners is to choose a pace that you are comfortable and confident with. If that means it’s a relaxing jog, then so be it. It’s better to get to the finish line of your half marathon than burn out during training and not even start.

2. Prioritise The Long Run

12 week half marathon training plan

Some people love their weekly long run.

Others get restless and uncomfortable when trying to keep running for so long.

Whether you love it or hate it, you should prioritise your weekly long run.

In fact, it’s the most important run of your entire week.

The long run is the workout which really builds your endurance. It teaches your muscles to keep going for longer and longer, it trains your cardiovascular system to keep delivering oxygen efficiently to your muscles, and tells your body that it needs to get good at fuelling for longer periods.

For the 12 week half marathon training plan, remember that it’s not necessary to run your entire long run. Feel free to take walking breaks, or even adopt a structured run/walk approach to your training.

But if you need a break from your training and want to skip a workout, try not to skip the long run.

3. Know When To Take a Break

12 week half marathon training plan

Downtime is essential for runners.

Putting aside time to focus on rest and recuperation allows your body to relax, heal, and re-build – so it will be ready and stronger for the next workout.

The 12 week half marathon training plan includes 2 rest days a week, but remember that the plan should be flexible and based around your life; not the other way around.

So if you get to Friday and are totally burned out by a heavy week – whether in training, work life, or at home – never feel bad about granting yourself an additional rest day.

Perhaps the most important thing to do when training for a half marathon is to listen to what your body is telling you – if you find that training is getting harder and takes more and more effort, it’s probably a sign you need a break.

4. Strength Training Is Your Secret Weapon

12 week half marathon training plan

The 12 week half marathon schedule includes one day of cross training per week. While cross training can include any activity which complements your run training, I highly recommend doing a simple strength training workout.

Strength training, especially when focussed on the upper legs, core, and back, can have a huge impact on your running abilities.

Not only does it make you less injury-prone (those exercises tend to address muscular imbalances), it also makes you a more economical runner. In other words, you get more miles per gallon out of your legs, so you’ll find you can go a little faster.

Read our 6 Essential Bodyweight Exercises for Runners

Check Out Our 20 Minute Bodyweight Workout For Runners (No Equipment Needed)

12 week half marathon training plan

The 12 Week Half Marathon Training Plan

Who Is It For?:

This plan is for beginners and intermediate runners preparing for their first half marthon.

You should ideally be able to run 3 miles (or 5km) without stopping before commiting to the plan.

(If this seems like a lot, you can adopt a run/walk strategy in your training and race.)

If you’re looking for a great plan to get you through your first half marathon, then this is it!

How Long?: 

12 weeks // 3 months.


The plan includes 4 runs a week:

  • 2 regular training runs,
  • 1 tempo run (or another regular training run, if you prefer),
  • 1 long run at the weekends.

There is also one day of cross training included. This leaves 2 rest days per week.

The plan is designed to cover the required mileage and hours on your feet to get you ready for your half marathon!

All of the regular runs should be done at a comfortable, sustainable, conversational pace; don’t worry about your pace or finishing time if this is your first half marathon effort.

For the Wednesday Tempo Run, you can choose whether you want to increase the pace a little and target a specific race pace, or simply hang back and stick to your comfortable conversational pace.

Long runs on Sundays are there to increase your maximum mileage and time on your feet.   The whole purpose of these is to run slowly – at a conversational pace – no faster. 

If you are struggling during these long runs, feel free to take walking breaks, no worries. The important thing is to cover the mileage necessary.

The plan includes one day or cross training and two rest days.   The rest days are especially important for letting your body recover.

Feel free to download the plan and change it up to suit your schedule!

Download The 12 Week Half Marathon Training Plan Here

Enter your email and I’ll send you this free training plan now, in PDF and Google Sheets formats (completely customisable), in both miles and kilometers.  

12 Week Half Marathon Training Plan 1

Check Out The Premium Version of The 12 Week Half Marathon Training Plan . . .

We’ve teamed with TrainingPeaks to offer a premium version of the 12 Week Half Marathon Training Plan:

Access the plan via the TrainingPeaks website and app, track your workouts in real-time against the plan, and get performance data analysis on your progress.

Check out the premium 12 Week half marathon training plan here!

trainingpeaks training plan

The most comprehensive plan you will find

Rated 5 out of 5
October 28, 2019 7:05 pm

I had run a couple of half marathons and was in reasonable shape coming into the plan and it was a good rise in intensity throughout. You need to want to do an event like this – I was getting up at 3am to get my long run in before kids weekend sport etc and this was hard. When you combine the plan with the online community through the Marathon Handbook FB page and website, you get complete support. Have used this plan with great success and now looking at upping the pace in the marathon space… GREAT JOB!

Rob McCaw

Great Plan!

Rated 5 out of 5
January 13, 2022 10:04 pm

I’ve just signed up to the free plan, it was very easy and straight forward for me (and I’m not usually very good with ICT!)
The information I have received so far is very informative and goes into great detail explaining everything you need to know about each individual plan as well as nutrition, pace, goals, cross training, strength training etc There is also advice on what to wear (or what not wear) and things I haven’t even thought about. (So thank you in advance for this!)
I’m so impressed with all the information so far that I’m seriously considering signing up for the Premium Plan option. It’s early days for me but I’m inspired already!
I would say to anyone looking for a plan to seriously consider a Marathon Handbook Plan. I honestly don’t think you’ll be disappointed.
I’ve also downloaded the app and again I’m very impressed so far. I am confident that my plan (and the app) are going to get me across the finish line and achieve my marathon goal.


Waste of time

Rated 1 out of 5
January 10, 2022 3:25 pm

There is no detail whatsoever in this plan. For example, Thursdsay “Strength Training” 45-60 minutes. What strength training should I do? Should I do it for 45 or 60 minutes? What is RPE? What is the difference between a training run and a pace run.


Training plan?

Rated 1 out of 5
December 28, 2021 9:21 pm

Where is the 100k training plan? There’s nothing here to download.


Where is it?

Rated 1 out of 5
December 27, 2021 5:08 pm

You claim to offer “free” plans but I can not open it to provide my e-mail address. The only possible way is for me to go through Training Peaks.

Jim Neely

12 Week Half Marathon Training Plan 2
12 Week Half Marathon Training Plan 3

Proven Training Plans by a UESCA-certified Running Coach 

Every one of our training plans has been developed by Thomas Watson, a UESCA-certified running coach.

Thomas is also a podium-finishing ultra-marathon runner, and has dozens of marathons under his belt.

Each training plan has been road-tested by hundred of runners, refined and improved – and are free to download and customise to suit your needs!