What's a Good First Marathon Time?

Most first marathons take somewhere between 4:30 and 5:30, and the average US finish time is 4:34. Anything inside that range is a normal debut.

Finishing a first marathon is an achievement in itself. Covering 26.2 miles, or 42.2 km, puts you in a very small group of people who have gone that far, and the number on the clock comes second.

Below, we cover the average times by age and sex, how to set a goal you can hold, run close to your number on race day, and finish inside the course time limit.

Average marathon finish times by age and sex

Finish times vary hugely from runner to runner, so treat any average as a rough guide.

The table below shows average US marathon times* by age group, drawn from more than 10 million race results.

Across all US finishers:

• Men: about 4:24
• Women: about 4:51
• Everyone: about 4:34

Worldwide the picture looks similar, with an average close to 4:33 across a much larger pool of races.**

These numbers include every finisher, from runners on their twentieth marathon to people who had never raced before. Your first marathon will usually come in slower than the average for your age group, because those figures include runners with years of training behind them.

What counts as a good first marathon time

For a first marathon, a good time is the one you can hold to the finish. Most debuts fall between 4:30 and 5:30, and both ends of that range are normal.

If you want specific numbers, under 4:00 is a strong first marathon for most people, and under 3:30 is quick. Above 5:30 is common too, especially with a hilly course or a hot day.

Your own feeling at the finish is a better measure of a first marathon than your time. Crossing the line with a smile, having enjoyed the day and the course, makes the debut a success, whatever number the clock shows you.

How to set a realistic goal for your first marathon

Two numbers predict your marathon: your long run pace and your most recent race result.

Your half marathon result gives you a quick estimate. Coaches commonly predict a first marathon by taking the half marathon time, doubling it, and adding 20 minutes. For example, a 2:10 half points toward a first marathon somewhere near 4:40.

If your longest race is a 10K, use Riegel's formula, the standard method for converting a time at one distance into an estimate at another. It is widely used in race-time calculators, and for the marathon it works out to roughly 4.7 times your 10K time.

For example, a 55:00 10K points toward about 4:15, and a debutant should plan to be slower than that, because the formula assumes marathon training behind the result.

Your long runs give you a more reliable answer than any formula. Take the pace you held on your longest run and ask how the last two miles went. If you could have carried on at that pace, it is a fair target for race day.

Goal pace for a first marathon usually comes out at long run pace or slightly slower, because race day adds another six to eight miles (10 to 13 km) to the longest run you have done.

Give yourself two times for race day. The first is your goal, the second is 15 to 20 minutes slower and still a result you would be happy with. Having it decided in advance keeps you running when the first time goes. Runners without a plan B often push harder, pay for it over the last stretch, and finish slower than the backup time would have given them.

Why marathon times vary so much more than shorter races

A marathon takes several hours, and a lot can happen in that time. Here’s what affects your finishing time:

Low fuel stores. Your muscles hold enough glycogen, the stored carbohydrate you burn at pace, for roughly 18 to 20 miles (29 to 32 km) of running. Once it runs down, your pace drops sharply whether you want it to or not. Runners call this hitting the wall.

Taking in 30 to 60 grams of carbohydrate an hour from gels, chews, or sports drink delays that drop. Skipping fuel because you feel fine is one of the most common first-marathon mistakes.

Pacing mistakes. Thirty seconds a mile too fast feels like nothing for the first hour and costs several minutes over the second half.

Hot weather. Heat counts for more over four hours than over 25 minutes. A warm day can add 10 to 20 minutes to a marathon that would have been comfortable in cool conditions.

The course. Hills and crowded start corrals both cost time, which is why the same runner can show very different results at two races a month apart.

What the course time limit means for you

Most road marathons give you 6:00 to 6:30 to finish, and plenty of smaller races allow 7 or 8 hours.

In practice, a 6:00 limit works out to about 13:45 per mile (8:33 per km), and a 6:30 limit to about 14:50 per mile (9:13 per km). A steady run-walk at 13 to 14 minutes a mile (8:05 to 8:42 per km) clears both with room to spare.

Check the limit on the race website before you sign up, along with how it is measured. Larger races usually time you from the moment you personally cross the start mat, so a late wave start costs you nothing. A few smaller events still count from the gun.

If you fall behind the cutoff, a vehicle or a cyclist travelling at limit pace will catch up with you, and you may be asked to move onto the sidewalk or take a ride to the finish. That is the only real consequence, and for most runners who have trained for months it never comes close.

How to run close to your goal time

Reaching your goal time depends on how you train and how you start. These four things matter most:

1. Build the long run. Work up to at least one run of 18 to 20 miles (29 to 32 km), and treat those final long runs as the best predictor you have.
2. Rehearse goal pace. Include a few miles at your target pace inside two or three long runs, so the effort is familiar before you have to hold it for hours.
3. Practice your fuel. Use the same gels or drink in training that you will use in the race, at the same points, so you are not trying anything new on race day.
4. Start slower than feels right. Run the first 3 miles/5K about 10 to 15 seconds per mile (6 to 9 seconds per km) slower than goal pace. Many runners around you will go out too fast, and you will pass a number of them after mile 20.

Whatever the clock says, your first marathon becomes the number every race after it is measured against. Train for it, leave other people's times alone, and aim to cross that line smiling.

Frequently asked questions

Is 5 hours a good marathon time for a first marathon?

Yes. A 5:00 marathon is a normal and respectable debut, within half an hour of the average US finish time. For a first marathon it means your training worked.

Is it OK to walk during a marathon?

Completely. Many runners plan walk breaks from the start, walking 30 to 60 seconds at each mile or each aid station, and finish quicker than they would have by running until they faded. Walking through aid stations is also the easiest way to drink without choking.

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

Most beginner plans run 16 to 20 weeks and assume you can already run 3 to 4 times a week. If you are starting from very little running, give yourself several months of easier base building before the plan begins.

Is a sub-4-hour marathon realistic for a beginner?

For some. It needs about 9:09 per mile (5:41 per km) for the full distance, which usually means a half marathon around 1:50 and a training block with consistent weekly mileage. It is a reasonable second-marathon goal for many runners who debut near 4:30.

Sources
* US averages by age and overall: analysis of 10,482,628 US marathon results from 6,352 events, 2024 figures (RunRepeat, The State of US Marathons).
** Worldwide average: analysis of 107.9 million race results worldwide, 2018 figures (RunRepeat, The State of Running).