A half-marathon plan may contain five different pace labels in one week. The numbers can look precise, but the body does not read a spreadsheet. Sleep, terrain, wind, heat and accumulated fatigue can make the same speed produce a very different training load.

The useful approach is to treat pace as a starting target and effort as the final check. This guide explains how to set realistic half marathon training paces, how each zone should feel, and when to ignore the watch.

The Five Useful Half Marathon Training Paces

These are working zones, not five hard boundaries. Easy and steady overlap. Threshold is an individual physiological region rather than a universal watch setting. Half-marathon pace may sit close to threshold for a fast runner but materially below it for someone whose race lasts two hours or more.

Reviews of successful distance-running programmes consistently show a large proportion of training below the first threshold, with smaller doses of moderate and high intensity. That does not mean every runner needs an exact “80/20” split. It means the harder paces work best when easy running is genuinely easy enough to support them.

How to Set Your Training Paces

1. Start with current fitness, not your dream result

Use a recent race or controlled time trial completed in representative conditions. A 5K or 10K from the last four to eight weeks usually gives more useful information than a personal best from several years ago. A recent half marathon is even more specific, provided it was paced sensibly.

A goal can guide long-term planning, but it should not determine every workout. If your current half-marathon fitness is 1:50 and your target is 1:40, forcing 1:40 race pace through the first week turns specific practice into an oversized stimulus.

2. Calculate exact half-marathon pace

Enter a realistic finish time in the running pace calculator to convert it into pace per kilometre, pace per mile and race splits. Common targets are:

Race pace is one reference point, not the centre of every run. You do not need to spend most of the week near it to become better at holding it.

3. Set easy pace by conversation first

Easy pace should allow full sentences without strain and leave you able to run again the next day. Start slower than instinct suggests during the first ten minutes. If breathing settles and mechanics remain relaxed, pace can naturally increase without turning the run into steady work.

Do not use one fixed easy number in all conditions. A range of 30–60 seconds per kilometre is normal for the same runner across fresh, tired, cool, hot, flat and hilly days. Faster is not automatically more aerobic; it may simply increase the cost of a session that was meant to preserve consistency.

4. Define steady pace as controlled, not “medium hard”

Steady running sits between easy and half-marathon effort. Breathing is deeper, but the pace remains smooth and sustainable. It works well in short blocks or near the end of selected long runs. The trap is accumulating too much steady work unintentionally because easy days keep drifting faster.

If your week already includes threshold intervals and a demanding long run, steady running should be used sparingly. The guide to weekly mileage for a half marathon explains why training load is the combination of volume and intensity—not mileage alone.

5. Estimate threshold from several signals

Threshold is often described as approximately one-hour race effort, but that shortcut is more reliable for trained runners. In practice, use a recent race prediction, a controlled RPE around 7/10, stable breathing and even repetitions. You should finish believing that one more repetition was possible.

Depending on ability and workout duration, threshold pace may fall between current 10K and half-marathon pace. Shorter repetitions can sit toward the faster end; a continuous tempo should be more conservative. For complete sessions and progressions, use the guide to the best threshold workouts for half-marathon training.

6. Match interval pace to repetition length

“Interval pace” is not one speed. A 60-second hill, a set of 3-minute repetitions and five 1K repeats create different demands. Choose the slowest pace that produces the intended hard-but-repeatable effort with stable mechanics. If the first repetition is dramatically faster than the last, the target was too aggressive.

Worked Example: Training Paces for a 1:45 Half Marathon

A 1:45 half marathon requires approximately 4:59/km or 8:01/mile. The following ranges are a sensible first estimate for a runner whose recent results genuinely support that time. They are not universal prescriptions.

Suppose the runner attempts 3 × 10 minutes at 4:42/km on a hot morning. The first rep feels like 8/10 and the third fades badly. The correct response is not to fight for 4:42. Slow to 4:50–5:00/km, shorten the final rep, or run by effort. The physiological purpose matters more than matching a theoretical cell in a table.

Conversely, if 4:50/km feels smooth for all three repetitions in cool conditions, progression does not require an immediate pace increase. Adding a few minutes of total threshold time in a later week may be the safer next step.

How the Paces Fit into a Four-Run Week

This simple distribution keeps the hardest session distinct. Later in a build, Tuesday might contain half-marathon-pace blocks, or Sunday might include a controlled race-specific finish. Avoid upgrading both sessions in the same week unless your history and recovery clearly support it.

For a full calendar, see the free 12-week half-marathon plan with four runs per week. The paid 12-Week Half Marathon PB Plan adds four- and five-day schedules, an editable workbook, pace guidance, adaptation rules and English and French guides.

Half-Marathon Pace Workouts That Make Sense

Race-pace work is most useful when it teaches rhythm under control. Begin with manageable blocks rather than trying to prove you can already race the distance.

• Introductory: 3 × 10 minutes at current half-marathon effort, with 3 minutes easy.
• Developing: 3 × 3 km at current half-marathon effort, with 1 km easy.
• Long-run combination: 90 minutes total with 3 × 12 minutes at half-marathon effort.
• Race-specific: 2 × 20 minutes at half-marathon effort within a medium-long run.

Warm up before every session and keep the first block conservative. A session that ends with stable posture and pace teaches more than one that becomes a time trial. The separate half-marathon pacing strategy guide covers how training rhythm translates into race-day splits.

When Pace Should Change

Heat and humidity

Heat increases cardiovascular strain at a given speed, especially when humidity limits evaporative cooling. Slow down and use breathing or perceived effort. A pace that was threshold in cool weather can become unsustainably hard in summer conditions.

Hills and wind

Hold effort uphill rather than forcing flat-road pace. Let speed rise gradually on the descent without sprinting. Into a headwind, use posture and steady effort; pace will usually recover when the route turns.

Fatigue, illness and disrupted sleep

If easy pace requires unusually high effort, treat it as information. Shorten the run, stay easy or rest. Do not compensate later by stacking missed work. The missed-week training guide provides a practical return sequence after a larger interruption.

Improving fitness

Review training paces every four to six weeks, after a race, or after a controlled benchmark—not after one unusually good workout. Fitness gains should first appear as lower effort at the same pace, stronger final repetitions and better recovery.

Should You Use Heart Rate, Pace or RPE?

Use all three when available, but give each the job it performs best:

• Pace is useful on flat, repeatable terrain and for race-specific rhythm.
• Heart rate helps describe internal load during sustained running but lags during short reps and changes with temperature, hydration, caffeine and fatigue.
• RPE and breathing respond immediately and remain useful on hills, in heat and when GPS is unreliable.

A good session usually produces agreement between the signals. If pace says “easy” but breathing says “moderate,” believe the breathing and slow down. If heart rate looks unusually low during a short interval, remember that the signal may not have caught up.

Common Half Marathon Training Pace Mistakes

• Using goal pace as current fitness. Aspirational numbers create oversized sessions.
• Running easy days at the top of the range. The slow end is not failure.
• Turning threshold into a race. Threshold should remain repeatable.
• Using instant GPS pace. Short-term noise encourages unnecessary surges.
• Ignoring terrain and weather. Equal pace does not mean equal load.
• Changing pace after every workout. Progress is a trend, not one data point.
• Adding intensity and volume together. Change one main stressor at a time.
• Collecting too many zones. Five practical labels are usually enough.

Frequently Asked Questions

How much slower than half-marathon pace should easy pace be?

There is no universal gap. For many runners it may be roughly 45–100 seconds per kilometre slower, but fitness, race duration and conditions change the relationship. Conversation and recovery are more important than a fixed subtraction.

Is threshold pace faster than half-marathon pace?

Usually, but the gap varies. It may be small for a fast runner whose half marathon is near one-hour race intensity and larger for a runner racing for two hours. Workout duration also matters.

How often should I run at half-marathon pace?

Once every one or two weeks can be enough during the specific phase of a plan. Short early blocks may become longer later, while total hard running remains compatible with recovery.

Can my long run be faster than easy pace?

Sometimes. Selected long runs can finish steady or include controlled half-marathon blocks, but most long-run time should remain easy for recreational runners. Do not make every Sunday a progression run.

Should treadmill pace match outdoor pace?

Not necessarily. Calibration, belt mechanics, airflow and room temperature affect effort. Use the displayed pace as a repeatable reference on that treadmill and confirm it with breathing and RPE.

What if my watch and measured race pace disagree?

Certified race distance and official time are the better reference. GPS devices can record extra distance and fluctuate through turns, tree cover and buildings.

Sources and Further Reading

• Faude, Kindermann and Meyer: lactate-threshold concepts and endurance-performance validity.
• Campos et al.: systematic review of training-intensity distribution in middle- and long-distance runners.
• Casado et al.: systematic review of distance-running periodization, methods and intensity distribution.
• Stöggl and Sperlich: training-intensity distribution among well-trained and elite endurance athletes.
• World Athletics: practical guidance on building aerobic fitness.

Editorial disclosure: This article was written for Endurance Unpacked by Vincent Meheut, an amateur runner and long-course triathlete sharing practical training experience. Vincent is not a certified running coach or medical professional. The content combines first-hand experience with cited research, is provided for general education, and does not replace individual coaching or medical advice.