First Time Running a Half Marathon: A Step-by-Step Guide for Beginners

By Lauren Holland

Updated November 2026

Running a half marathon for the first time is a realistic goal for most people who can already run comfortably for 30 minutes. This guide walks you through choosing a race, building a 12-week training block, practicing your fueling, setting a pace you can hold, and handling race day. By the end, you will have a clear plan and a checklist you can use to cross the 13.1-mile finish line with energy to spare.

Step 1: Check Your Starting Point Honestly

Before you pick a date, look at how you run now. A good rule of thumb is that you should be able to run three to four miles without stopping, three or four times a week, before starting a half marathon plan. If you are starting from zero, add a few weeks of run-walk intervals first. Consult a doctor before starting a new training program, especially if you have heart, joint or breathing concerns, or have been inactive for a long time.

Shopping for one? See our guide: First Ever Marathon Time: 3 Best Guides and Pace Tools for First-Timers.

If you want a sense of where a first-timer typically lands on race day, Average First Half Marathon Time: What Most Beginners Run gives useful context for setting expectations.

Step 2: Pick the Right Race

Choose a race eight to sixteen weeks out, depending on your current fitness. Look for these factors:

• A course with elevation that matches your training terrain. Hilly courses are harder on first-timers than flat ones.
• A cutoff time that gives you comfortable room. Check the official race website for the finish-line cutoff and the pace it implies.
• Weather patterns for that date. Races in early spring or fall often offer the most forgiving conditions.
• Crowd size. A smaller race can feel less overwhelming on your first start.

If you are deciding between two local options, San Francisco Half Marathon First or Second: Which Should You Choose? shows how course profile and race experience can shape that choice.

Step 3: Build a 12-Week Training Plan

Most beginner plans run 10 to 14 weeks. The structure matters more than the exact length. Your weekly training should include three types of running:

• Easy runs at a conversation pace, most of your weekly volume.
• One long run that grows each week, building endurance for the distance.
• One optional workout, such as tempo or intervals, once your easy running feels stable.

A general progression looks like this:

These are typical ranges for a first half marathon, not fixed prescriptions. Increase weekly mileage by no more than about 10 percent per week, and take a lighter week every three or four weeks. For a deeper walkthrough of building the full schedule, see Training for First Half Marathon: A Step-by-Step Guide for Beginners.

Use Run-Walk Intervals if You Need Them

Run-walk intervals are not a sign of failure. Many experienced coaches recommend them for first-timers because they reduce fatigue and joint stress. A common approach is to run 4 minutes and walk 1 minute, then adjust the ratio as your legs adapt. Some runners keep walk breaks through the entire race and finish strong.

Step 4: Practice Your Pacing

The most common first-timer error is starting too fast. The excitement of race morning pulls you into a pace you cannot hold past mile 6. Use these habits to avoid it:

1. Calculate a realistic goal pace from a recent 5K or 10K result, or use a race-time predictor.
2. Run most of your training at easy, conversation pace, which is often 60 to 90 seconds per mile slower than goal pace.
3. Do one or two long runs with the final few miles at goal pace, so the rhythm feels familiar.
4. On race day, start about 15 to 20 seconds per mile slower than your goal for the first two miles.

If you are unsure what finish time to aim for, What's a Good First Half Marathon Time? Realistic Goals for Beginners explains how to set a goal that matches your fitness rather than a number you read online.

Step 5: Plan Your Fueling and Hydration

Thirteen miles is long enough that you need a plan for fuel and fluids, especially if your long runs go beyond 90 minutes.

• Practice fueling on every long run over 75 minutes. Most runners aim for roughly 30 to 60 grams of carbohydrate per hour, but tolerance varies widely.
• Use the same gels, chews or sports drink you plan to use on race day. Never try something new for the first time on race morning.
• Drink to thirst during training rather than following a rigid schedule. Learn how your body responds on hot and cool days.
• Check the race website for aid station locations and products, so you can plan whether to carry your own fuel.

Anyone with diabetes, a history of digestive problems, or other medical conditions should talk with a doctor or registered dietitian before settling on a fueling strategy.

Step 6: Prepare Your Gear and Shoes

You do not need much, but a few items matter. Wear shoes you have already trained in, ideally with at least 30 to 50 miles on them, and avoid debuting new footwear on race day. Choose moisture-wicking clothing and test it on a long run to check for chafing. Plan your race-day layers for the temperature at your start time, not the temperature at your house.

Race-Week Checklist

1. Race bib and any chip or timing instructions, printed or saved to your phone
2. Shoes, socks and a tested outfit laid out the night before
3. Gels, chews or other fuel you have practiced with
4. Safety pins or a race belt for your bib
5. Body glide or anti-chafe balm for areas you have had trouble with
6. A plan for getting to the start, including parking, transit and bag check
7. Warm layer for the start area, which is often chilly before the gun
8. Post-race clothes and a snack for afterward

Step 7: Handle Race Day

Eat a familiar breakfast two to three hours before the start, and drink fluids steadily but not excessively. Arrive early enough to use the restroom and find your corral without rushing. Start slower than feels right. Take fuel at the times you practiced, and use water stations to sip rather than gulp. In the final miles, focus on your form, relaxed shoulders and short, quick steps rather than the finish-line clock.

Common Mistakes First-Timers Make

• Going out too fast. Pace the first 3 miles conservatively even if you feel great.
• Skipping long runs. The long run is the core of your training, so protect it.
• Ramping mileage too quickly. Most overuse injuries come from doing too much too soon.
• Trying new gear or fuel on race day. Test everything on training runs first.
• Ignoring pain. Sharp, localized or worsening pain is a signal to rest and seek advice from a healthcare professional.
• Chasing a time you have not trained for. Finishing comfortably is a legitimate first-race goal.

Recommended Gear

A few items can make training and race day noticeably more comfortable. Choose gear that fits your stride and climate.

• Running shoes: A neutral or stability shoe that fits your gait and has been tested through your training block. View on Amazon
• Moisture-wicking running socks: Fewer blisters than cotton, and they stay comfortable over 13 miles. View on Amazon
• Anti-chafe balm: A stick or tube balm for inner thighs, underarms and nipples, where chafing often starts. View on Amazon
• Handheld water bottle: Useful for long training runs when aid stations are far apart. View on Amazon

FAQ

How long does it take to train for a first half marathon?

Most beginner plans run 10 to 14 weeks, assuming you can already run about three miles comfortably. If you are starting from scratch, a longer build of 16 to 20 weeks is often safer.

Can I walk during a half marathon?

Yes. Walk breaks are allowed in virtually every race and are a common strategy for first-timers. Many runners who walk through aid stations or hills still finish well within the cutoff.

How many days a week should I run to prepare?

Three to four running days per week is typical for a first half marathon. Cross-training or strength work on other days can support your running without adding much impact.

Do I need to run every long run at race pace?

No. Most long runs should be at an easy, conversational pace. Only a few sessions should include stretches at goal pace to build familiarity.

What should I eat the night before a half marathon?

Choose a familiar, carbohydrate-based meal that you have eaten before long runs, and keep fat and fiber moderate. Avoid trying new foods the night before the race.

What if I get injured during training?

Stop running if you have sharp or worsening pain, swelling, or pain that changes your running form. Consult a doctor or physical therapist before resuming. Some runners adjust their race goal or take a deferral to a later event rather than risk a longer injury.

Is it normal to feel exhausted after the race?

Yes. Most runners feel tired and sore for several days afterward. Light walking, hydration and easy movement usually help. Take at least a few easy days before returning to structured training.

Conclusion

Running your first half marathon comes down to honest preparation: a sensible race choice, a progressive training plan, practiced fueling and a pace you can hold. Start conservatively, respect your recovery, and treat finishing as a real achievement. With a clear plan and the checklist above, you will be ready to start with confidence.

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.