5km to Half Marathon
Training Plan.

How to move from a finished 5km to a 21.1km half marathon. The free no-time-target half plan is 12 weeks with three runs most weeks . Exact sessions live in the app and sync to Garmin and Coros where that delivery is supported.

Start the half marathon plan Browse half marathon plans

Who this is for.

This plan fits you if

  • You have finished a 5km and want to train for 21.1km.
  • You want the app to give you the exact session, on your watch where Garmin or Coros delivery is supported.
  • Finishing is enough, or you already have a half marathon time in mind and need to pick the plan that matches it.

This is not for you if

  • You cannot run 5km yet. Start with a 5km plan, then come back.
  • 21.1km feels too far right now. Use a 10km plan first.
  • You already have a finish time. Open it on the half marathon plans.

Finishing, with no clock in mind? Your first half marathon is that plan.

How to move from a 5km to a half marathon.

A half marathon is 21.1km. The long run is the session that builds toward it, and you pick a goal before you start: finish, or a time you already have. Start a plan and the app gives you the exact session.

  1. Start from a finished 5km

    A completed 5km is the base, including after a couch-to-5km block. If you cannot run 5km yet, use a 5km plan first.

  2. Choose the goal

    Finishing means the no-time-target half marathon plan. A time you already have means a plan on the half marathon hub.

  3. Start the plan in the app

    The no-time-target half plan is 12 weeks. Most weeks have three runs: one faster session, one easy run, and one long run. The app holds the exact sessions. Garmin and Coros get the workout where that delivery is supported.

  4. Choose a race on the calendar

    Open the race calendar and pick the event you want to train for. The date is what you count back from.

Choose a race.

The plan is the training. A race gives you the date to count back from. Use the race calendar to choose the event.

Open the race calendar

Start the half marathon plan

Open the No Time Target Half marathon (12 weeks). Exact sessions in the app. Free on iOS and Android.

View the plan

Already have a time in mind? Browse half marathon plans. Finishing is the whole goal? Your first half marathon.

FAQs.

Can I train for a half marathon after a 5km?

Yes, once you can finish a 5km. A half marathon is 21.1km, so the change is time on your feet. Start a half marathon plan in the app and follow the sessions it gives you. If you cannot yet run 5km, use a 5km plan first.

How do I choose a half marathon plan after a 5km?

Choose the goal you already have. If finishing is the goal, use the no-time-target half marathon plan. If you already have a finish time, open that plan on the half marathon plans page. Either way, start it in the app and the exact sessions are there.

How do I move from a 5km to 21.1km?

Start the half marathon plan and protect the long run. That session is what builds toward 21.1km. Do the session the app gives you, then the next one. If 21.1km feels too far right now, use a 10km plan first.

How long does it take to train from a 5km to a half marathon?

12 weeks on the no-time-target half marathon plan. Start at week 1 when you can. If race day is closer, join later and keep the long run as the session you protect. The exact sessions are in the app.

Do I need a time goal?

No. Finishing 21.1km is a complete goal. Use the no-time-target half marathon plan. The first half marathon page is that same finish-focused path. Pick a time-target plan only when you already know the finish time you want.

What if I have not finished a 5km yet?

Stay on a 5km plan until you can finish 5km. A half marathon plan assumes that base. Come back when the 5km is done.

How do I choose a half marathon race?

Open the race calendar and pick the event. The plan is the training. The race is the date you count back from.

Do the sessions sync to Garmin or Coros?

Yes, where Garmin or Coros delivery is supported. Workouts on the half marathon plan sync to Garmin and Coros so the session is on your watch.