First Half Marathon Plan: A 12-Week Guide for Beginners

By Lauren Holland

Updated November 2026

A first half marathon plan gives you a structured path from your current running level to 13.1 miles on race day, usually across 10 to 16 weeks. This guide walks you through how to set your starting point, build weekly mileage safely, schedule your runs, practice fueling, taper and prepare for the start line. If you already run three or four days a week, you can finish a half marathon with a plan like this without getting hurt or burning out.

Step 1: Check Whether You Are Ready to Start

Before you pick a schedule, confirm that you can run comfortably for at least 20 to 30 minutes without walking. Most beginner half marathon plans assume you can already run about 15 to 20 miles per week. If you are starting from zero, spend four to six weeks building a base first. Talk to a doctor before starting a new training program, especially if you have heart, joint or breathing concerns, or if you have been inactive for a long time.

Shopping for one? See our guide: Furman First Half Marathon Training Plan: 6 Best Picks for Beginners (2026).

Quick readiness check

• You can run 3 miles (about 5 km) continuously at an easy, conversational pace.
• You can run or run/walk at least three days per week without pain that lasts beyond a day.
• You have a race picked out, roughly 10 to 16 weeks away.
• You own running shoes that fit well and have a few hundred miles or less on them.

Step 2: Choose the Right Length for Your Plan

Most first-timers do well on a 12-week plan. Longer plans (14 to 16 weeks) suit people with a lower starting mileage or a history of shin splints and other overuse injuries. Shorter plans of 8 to 10 weeks can work if you already run regularly and have a solid aerobic base. Choose the length based on how many weeks you actually have, then count backward from race day to place your build, peak and taper phases.

Step 3: Build Your Weekly Schedule

A good first half marathon plan usually includes three to four running days per week, one long run, one or two easy runs, and at least one full rest day. Cross-training such as cycling, swimming or strength work can replace one easy run, but it should not replace the long run. Keep most of your runs at an easy effort, where you can speak in full sentences.

Sample weekly structure

Step 4: Build Your Long Run Gradually

The long run is the backbone of any half marathon plan. Increase it by no more than about 10 percent per week, and every third or fourth week, drop back to a shorter run to let your body absorb the work. A typical progression for a 12-week plan looks like this:

1. Weeks 1 to 3: 4, 5 and 6 miles, then a recovery week at 4 miles.
2. Weeks 4 to 6: 7, 8 and 9 miles, then a recovery week at 6 miles.
3. Weeks 7 to 9: 10, 11 and 12 miles, with a 12-mile peak in week 9.
4. Weeks 10 to 11: 10 and 8 miles, as your taper starts.
5. Week 12: race week. Run 2 to 3 easy miles early in the week, then race on Sunday.

Step 5: Learn to Pace Your Easy and Long Runs

Most beginners run their easy days too fast. Use the talk test: if you cannot speak in full sentences, slow down. Many runners find that their long-run pace is 60 to 90 seconds per mile slower than their 5K race pace. Do not worry about hitting a specific time in training. Your goal is to finish the distance feeling strong enough to run again later in the week.

Step 6: Practice Fueling and Hydration

Your body can only store enough glycogen for roughly 90 minutes of running, so any long run over an hour should include fuel. Practice with the gels, chews or drinks you plan to use on race day. Start fueling around 45 to 60 minutes into a long run, then take about 30 to 60 grams of carbohydrate per hour depending on your tolerance. Test different products during training, not for the first time at the race.

Step 7: Add Strength and Injury Prevention

Two short strength sessions per week, about 20 minutes each, can reduce the risk of common overuse injuries. Focus on single-leg balance work, glute bridges, calf raises, planks and hip-strengthening exercises. Add mobility work after easy runs and keep your sleep consistent. If you feel sharp pain, swelling or pain that changes your running form, stop running and see a sports medicine professional.

Step 8: Taper and Prepare for Race Week

Reduce your total weekly mileage by about 20 to 30 percent in the final two weeks, but keep a few short, faster efforts so your legs stay sharp. Sleep well, eat familiar foods, and avoid trying anything new. Lay out your race kit, check the course map, and plan your travel and arrival time.

Race-day checklist

• Bib pinned to the front of your shirt, with your gels or fuel ready.
• Race shoes you have already run in, with laces tied and socks chosen.
• Breakfast you tested during training, eaten 2 to 3 hours before the start.
• Water or sports drink for the hours before the race, sipped regularly.
• Warm layer or disposable clothing for the start corral if the weather is cool.
• Phone charged, with an emergency contact saved and a plan to meet friends after the finish.
• Body Glide or similar anti-chafe product on areas that rub.

Common mistakes

• Running too fast on easy days. Most injuries and fatigue come from skipping the easy pace.
• Increasing mileage too quickly. Stick to the roughly 10 percent weekly increase and include recovery weeks.
• Skipping rest. Adaptation happens during recovery, not during the run.
• Trying new gear or fuel on race day. Test everything during long training runs.
• Ignoring pain. Mild soreness is normal, but sharp or worsening pain needs attention.

Tips for a successful first half marathon

• Pick a race with a generous time limit, so you can walk or run/walk if needed.
• Use a run/walk method during training if it helps you build endurance; many finishers do.
• Run a few shorter races, like a 5K or 10K, to practice race-day routines.
• Keep a simple training log so you can see your progress and spot fatigue early.
• Focus on finishing strong and healthy rather than hitting a specific finish time.

Recommended gear

Good gear will not replace consistent training, but these items can make your first half marathon plan more comfortable and safer to follow.

• Running shoes with a fit that suits your foot. A well-fitting neutral or stability shoe is the single most important purchase for most beginners. View on Amazon
• Moisture-wicking running socks. Synthetic or merino blends reduce blisters during long runs. View on Amazon
• A hydration belt or handheld bottle. Useful for carrying water and gels on runs longer than an hour. View on Amazon
• Anti-chafe balm. Helps prevent painful rubbing on long runs and race day. View on Amazon

FAQ

How long does a first half marathon plan usually take?

Most beginner plans run 10 to 16 weeks. Twelve weeks is a common length for runners who already run three days a week.

How many days a week should I run?

Three to four running days per week is typical for a first half marathon. Add cross-training or strength work to support your running.

Can I walk during a half marathon?

Yes. Many finishers use run/walk intervals, such as running 4 minutes and walking 1 minute. Walking is a legitimate strategy for finishing strong.

What is a long run for a beginner?

Your long run should build gradually to about 10 to 12 miles before race day. Keep it at an easy, conversational pace.

Do I need to taper before a half marathon?

Yes. Reducing mileage by about 20 to 30 percent in the final one to two weeks helps your body recover and arrive fresh.

Should I eat gels during a half marathon?

Many runners use fuel for races over about 75 to 90 minutes. Test your gels or chews during training first to see how your stomach handles them.

What if I get injured during training?

Stop running if you have sharp or worsening pain and consult a sports medicine professional or doctor. Adjusting the plan or extending your timeline is often better than pushing through an injury.

Conclusion

A first half marathon plan works best when it is gradual, consistent and built around easy running, a steady long run and smart recovery. Choose a timeline that fits your starting point, practice fueling and pacing before race day, and taper so your legs feel fresh at the start. Stay patient with the process, and you will cross the finish line with the confidence of a runner who trained well.

Related reading

• Furman First Half-Marathon Training Plan PDF: A Step-by-Step Guide
• First Half Marathon Training Plan: A 12-Week Guide for Beginners
• First Half Marathon Reddit: What Runners Really Say and How to Plan Yours
• What's a Good First Half Marathon Time? Realistic Goals for Beginners
• Training for First Half Marathon: A Step-by-Step Guide for Beginners
• Tips on Running First Half Marathon: 10 Steps for Beginners

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our marathon & half-marathon guides, checking product details against manufacturer specifications and owner feedback.