Lauren HollandBy Lauren Holland

Updated November 2026

A first half marathon training plan gives you a structured path from your current fitness to 13.1 miles. Over roughly 12 weeks, you will build your weekly mileage gradually, add one long run that grows each weekend, and learn how to pace, fuel and recover well enough to finish feeling strong. This guide walks through the planning decisions, shows a sample schedule, and flags the mistakes that cause most beginners to stall or get hurt.

Who This First Half Marathon Training Plan Is For

This plan suits someone who can already run for 20 to 30 minutes without stopping, or who has been walk-running for a few weeks. If you have not run at all, spend four to six weeks building a run-walk base first. Check with a doctor before starting a new training program, especially if you have heart, joint or blood pressure 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).

Step 1: Set a Realistic Goal and Timeline

Pick a race date 12 to 16 weeks away. Twelve weeks is enough for most beginners who already run three times a week. Your goal should be about finishing comfortably, not about a specific time. If you want a sense of likely finishing times, our guide on what’s a good first half marathon time is a useful reference point. Write your goal down and tie it to the race date so you have a clear target.

Step 2: Establish Your Weekly Base

Before you add distance, you need to run consistently. A common starting point is three runs per week totaling 12 to 15 miles. If you are starting below that, build up by no more than 10 percent per week. Most coaching guidelines suggest keeping your easy runs conversational, which means you can speak in full sentences while running.

Step 3: Build Your Long Run Progression

The long run is the backbone of any half marathon plan. It teaches your body to work for extended periods and builds the aerobic base that carries you across the finish line. Increase it by about one to two miles each week, then step back every third or fourth week to let your body absorb the work.

Sample 12-Week Schedule

Week Easy Run (x2) Midweek Run Long Run Weekly Total (approx.)
1 2 miles each 3 miles 4 miles 11 miles
2 2 miles each 3 miles 5 miles 12 miles
3 2.5 miles each 3.5 miles 6 miles 14.5 miles
4 (recovery) 2 miles each 3 miles 5 miles 12 miles
5 3 miles each 4 miles 7 miles 17 miles
6 3 miles each 4 miles 8 miles 18 miles
7 3 miles each 4.5 miles 9 miles 19.5 miles
8 (recovery) 3 miles each 4 miles 7 miles 17 miles
9 3.5 miles each 5 miles 10 miles 22 miles
10 3.5 miles each 5 miles 11 miles 23 miles
11 (taper) 3 miles each 4 miles 8 miles 18 miles
12 (race week) 2 miles each 2 miles Race: 13.1 miles Race day

Adjust these numbers to match your starting fitness. If a week feels too hard, repeat it rather than pushing forward. For a detailed breakdown of the final weeks, see your guide to the half marathon taper week.

Step 4: Add Structure With Pace and Effort

Most of your runs should be easy. Easy means you could hold a conversation without gasping. Beginners often run their easy days too fast, which leads to fatigue and injury. Use one short session per week, such as 4 to 6 repeats of 1 minute at a comfortable hard effort followed by 90 seconds of easy jogging, to improve leg speed without overloading your body.

Step 5: Plan Your Fueling and Hydration

Runs over 60 to 75 minutes benefit from fuel. Practice eating during your long runs so race day holds no surprises. Many runners use gels, chews or sports drinks. If you are considering gels, our overview of 6 best energy gels for half marathon training compares popular options. For a rough sense of how much you will need on race day, read how many energy gels for half marathon runners need.

  • Well-fitted running shoes: A proper fit matters more than brand. Visit a specialty running store if you can, and replace shoes after roughly 300 to 500 miles. View on Amazon
  • Moisture-wicking running socks: Blisters derail more first-time runners than fatigue does. Choose seamless or low-friction socks in a synthetic or merino blend. View on Amazon
  • Handheld water bottle or hydration belt: Useful for long runs when water stops are not available on your route. View on Amazon
  • GPS running watch: Helps you track pace and distance so you stick to easy effort on recovery days. View on Amazon

Common Mistakes to Avoid

  • Running easy days too hard. Keep most runs conversational.
  • Skipping rest days. Recovery is when fitness is built.
  • Increasing mileage too fast. Stick to the 10 percent guideline and schedule step-back weeks.
  • Trying new shoes, socks or fuel on race day. Test everything during training.
  • Ignoring pain. Soreness that fades is normal; sharp or worsening pain needs a rest and a professional opinion.

Tips for Race Week and Race Day

  1. Taper your mileage by about 20 to 30 percent in the final two weeks.
  2. Eat familiar, carbohydrate-rich meals for two to three days before the race.
  3. Pick up your bib early and review the course map and start time.
  4. Start slower than feels comfortable. Most first-timers go out too fast.
  5. Walk the water stations if needed. A brief walk does not cost you the race.

FAQ

How many days a week should I run on a first half marathon plan?

Three to four days is typical for beginners. Three runs plus one cross-training session works well for many people.

Can I train for a half marathon in 12 weeks?

Yes, if you already run regularly. Those starting from zero should plan for 16 weeks or more to reduce injury risk.

Should I walk during a half marathon?

Walking is allowed and can help you finish strong. Many runners use planned run-walk intervals during training and on race day.

Do I need to run the full distance in training?

No. Peaking around 10 to 11 miles on your longest run is common, since race-day adrenaline and the event itself carry you the final stretch.

What should I eat the night before?

Choose familiar, moderate-fat, carbohydrate-based foods such as pasta or rice with a simple sauce. Avoid trying anything new.

How do I know if I am overtraining?

Persistent fatigue, elevated resting heart rate, poor sleep, irritability and recurring injuries are warning signs. Reduce volume and consult a healthcare provider if symptoms persist.

Is a training plan necessary?

A plan is not strictly required, but a structured schedule reduces guesswork and lowers the chance of injury for most first-time racers.

Conclusion

A solid first half marathon training plan balances steady mileage growth, easy effort on most days and smart recovery. Start from your current fitness, follow a progression like the one above, and practice your fueling and gear before race day. Stay patient, listen to your body, and you will cross the finish line ready for your next goal.

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Lauren Holland

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.