Half Marathon Countdown: A 12-Week Plan to Race Day

A half marathon countdown works best as 12 weekly blocks: build your long run slowly for about nine weeks, hold steady, then taper in the final two weeks so you reach the start line rested. Set a live timer to your race start, then follow the week-by-week plan below.

This is general guidance for healthy adults who can already run or run-walk for around 30 minutes at a time. Before starting any new training plan, check with your doctor, especially if you have a health condition, an injury or haven't exercised in a while. Listen to your body, and adjust or pause the plan whenever something doesn't feel right.

Set Your Race Day Timer

A live countdown keeps race day real during the long weeks of training.

• Open our countdown creator and enter your race date and official start time.
• Use the race location's time zone if you're traveling to an event in another zone.
• Name it something motivating, like "13.1 Day."
• Add it to your phone's home screen so you see it every time you lace up.

A paper tracker helps too. Many runners print a countdown calendar and check off each workout. Our printable countdown calendar is a handy way to post your plan on the fridge.

The 12-Week Plan at a Glance

Long runs below are listed in miles and are suggestions only. Run at an easy, conversational pace on most days; you should be able to talk in short sentences.

A typical training week looks like this:

Swap days to fit your schedule. Just avoid putting hard efforts back to back.

Your Half Marathon Countdown, Week by Week

Week 1: Twelve Weeks Out, Build the Habit

The goal this week is simply to show up. Run three or four times, all at an easy pace. Your long run is about 3 miles, and walking breaks are completely fine.

• Set your race day timer and put your training days on a calendar.
• Check that your running shoes still feel supportive and comfortable.
• Start a simple log: date, distance, how you felt.

Week 2: Eleven Weeks Out, Find Your Rhythm

Keep the same number of runs and stretch the long run to about 4 miles. Focus on running relaxed. If you finish a run feeling like you could do a bit more, that's the right effort.

• Pick a regular time of day for runs so training becomes routine.
• Add a short warm-up walk and a few minutes of gentle stretching afterward.

Week 3: Ten Weeks Out, Practice Easy Pace

Hold the long run at about 4 miles. On one weekday run, add four or five short pickups of about 20 seconds, followed by easy jogging. This wakes up your legs without wearing you out.

• Notice how your body feels the day after each run.
• Add one cross-training session, like cycling, swimming or brisk walking.

Week 4: Nine Weeks Out, The First Step Up

Your long run grows to about 5 miles. Slow down a little on long runs; going farther matters more than going faster at this stage.

• Practice drinking water during runs longer than an hour.
• Try simple strength moves twice a week, such as squats, lunges and planks.

Week 5: Eight Weeks Out, Building Strength

The long run reaches about 6 miles. You're nearly halfway through the plan, and many runners feel a real boost in confidence here.

• Keep weekday runs easy.
• Pay attention to small aches. A twinge that fades during a run is common; pain that gets worse is a signal to rest and check with a doctor.

Week 6: Seven Weeks Out, Recovery Week

Drop the long run back to about 5 miles and keep all other runs short. Recovery weeks let your body adapt to the work you've done.

• Get extra sleep this week.
• Look at your log and celebrate how far you've come.

Week 7: Six Weeks Out, Practice Fueling

The long run climbs to about 7 miles. Start practicing what you'll eat and drink during the race, since long efforts can leave you low on energy.

• Try a small snack or sports drink partway through the long run to see what sits well.
• Never try anything brand-new on race day. Practice now.

Week 8: Five Weeks Out, Check Your Gear

Your long run is about 8 miles. This is the week to test everything you plan to wear on race day: shoes, socks, shorts or leggings, shirt and any belt or armband.

• Run the long run in your full race outfit.
• Note any rubbing or blisters and adjust before the race.

Week 9: Four Weeks Out, Your Longest Build

Push the long run to about 9 miles. Keep the pace easy, and take short walking breaks if you need them.

• Plan a route with water access or carry your own.
• Read the race guide: start time, course map, water station locations and rules.

Week 10: Three Weeks Out, Peak Long Run

This is your biggest run of the plan, about 10 miles. You don't need to run the full 13.1 miles before race day; adrenaline and rest will carry you the last few miles.

• Rehearse your race morning: wake-up time, breakfast and bathroom stop.
• Run part of this long run at your planned race pace if you feel good.

Week 11: Two Weeks Out, Taper Begins

Cut the long run back to about 7 miles and trim your weekday runs too. Tapering can feel strange, but it lets your legs recover so you start fresh.

• Keep a few short pickups in your runs to stay sharp.
• Prioritize sleep, hydration and regular meals.
• Pick up any final race supplies now.

Week 12: Race Week, Rest, Prep and Run

Run only two or three short, easy sessions early in the week and rest the last day or two. On race day, start slower than you think you need to. You can always speed up later.

• Lay out your race outfit the night before.
• Eat a familiar dinner and breakfast.
• Arrive early and enjoy the moment.

Race-Week Checklist

Use this list in the final days of your half marathon countdown:

• Race bib and any pickup confirmation
• Shoes and socks you've trained in
• Race outfit tested on a long run
• Weather-appropriate layers you don't mind leaving behind
• Water bottle or plan to use course water stations
• Snacks or fuel you've practiced with
• Watch or phone, charged
• Safety pins, if your bib needs them
• Sunscreen and anything else you use on long runs
• Directions, parking or transit plan, and the start time with a buffer

Race Morning Timeline

The last few hours of your half marathon countdown go by fast. A simple timeline keeps race morning calm. Adjust it to your race's start time and how far you live from the start area.

Set a second timer for wake-up. Many runners use a race day timer plus a separate countdown to their alarm the night before. If you want your timer to hit zero at an exact minute, our guide to a countdown to a specific time explains how.

After the Finish Line

Your countdown hits zero, you cross the line, and then what? A few simple steps help you recover well:

• Keep walking for a few minutes instead of stopping suddenly.
• Drink water and eat a snack from the finish area or your bag.
• Change into dry clothes if it's cool outside.
• Take a few easy days. Short walks are fine, but give your legs time to rest before running hard again.
• Celebrate! Take photos with your medal, write down how the day felt and thank anyone who cheered you on.

If anything hurts more than normal soreness in the days after the race, check with your doctor.

Many runners start a new countdown soon after, whether it's to another race, a fun run with friends or a new distance goal.

How to Choose Your Race

If you haven't signed up yet, a few things help first-timers:

Pick a race at least 12 weeks out. That gives you enough time to build up safely.

Look at the course profile. Flat courses are friendlier for a first half marathon. Big hills can be fun, but they make training harder.

Check time limits. Some races close the course after a set time. If you plan to run-walk, choose a race with a generous limit.

Think about weather. Races in mild seasons are easier on first-timers.

Choose a race you'll enjoy. A scenic route or a hometown event can make the long training weeks feel worth it.

How to Stay Motivated During a Long Countdown

Watch the timer drop. Seeing days turn into hours is surprisingly motivating, especially during the tough middle weeks.

Celebrate milestones. Mark your first 6-mile run, your first 8-mile run and your peak run with a small reward.

Find a buddy. Training with a friend or group makes early mornings easier.

Remember why you signed up. Write your reason on a sticky note and put it on your bathroom mirror.

For more on why looking forward to something can lift your mood, see our article on the psychology of anticipation. And if you're counting down to any other big event, our event countdown guide covers the basics.

Mistakes to Avoid

Building mileage too fast. Big jumps in distance are a common reason runners get hurt. Add distance gradually.

Running every run hard. Most training should feel easy. Save harder efforts for short pickups.

Skipping rest days. Your body gets stronger during recovery, not just during runs.

Trying new things on race day. New shoes, new snacks or a new outfit can cause trouble. Stick to what you've practiced.

Ignoring pain. Mild soreness is normal; sharp or worsening pain is not. Stop and check with your doctor.

Starting too fast. Excitement makes the first mile feel easy. Hold back early so you can finish strong.

FAQ

How long is a half marathon?

A half marathon is 13.1 miles, which is about 21.1 kilometers.

Is 12 weeks enough to train for a half marathon?

For many healthy adults who can already run or run-walk for about 30 minutes, 12 weeks is a common training window. Check with your doctor before starting, and give yourself more time if you're newer to exercise.

Do I need to run 13.1 miles before race day?

No. Most beginner plans peak at around 10 miles. Rest and race-day energy help carry you through the final miles.

Can I walk during a half marathon?

Yes. Many people use a run-walk approach. Just check the race's course time limit before you sign up.

What should I eat before the race?

Eat a familiar breakfast that you've tested before long training runs. Avoid trying new foods on race morning.

What is tapering?

Tapering means cutting back your training in the final week or two before the race so your body is rested and ready.

What if I miss a week of training?

Life happens. If you miss a few days, simply pick up where you left off. If you miss a full week or more, repeat the previous week before moving forward rather than jumping ahead. If you missed training because of illness or injury, check with your doctor before you start again, and don't try to make up lost miles all at once.

How do I set a half marathon countdown?

Open our countdown creator, enter your race date and start time, choose the race's time zone and save the link to your phone.