10k Race Pace What Zone Should You Run?

I have been training for a half-marathon using your 12-week program. I will be running my first 10k this weekend. Should I plan to run the 10k in zone 1 or zone 2?– Julia, Los Angeles, CA

Answer by Dom:
Hi Julia, great to hear you've been using the Half Marathon Running Program — that's a solid foundation and it'll serve you well this weekend. You've asked a genuinely interesting question, and the honest answer is that there isn't a single number I can hand you. What I can do is walk you through exactly how to think about it, so you can make a smart decision yourself.

The short version: for most first-time 10k runners, you'll end up somewhere between zone 2 and zone 3 during the race — and that's perfectly fine. What matters far more than hitting a specific zone is starting at the right effort and having enough left to finish strong.

I'll break this down as follows:

1. What heart rate zones actually mean in practice
2. Where most runners naturally land on 10k race day
3. How to use your training pace to predict your race pace
4. A race strategy built around finishing strong

What Heart Rate Zones Actually Mean

You've been training with heart rate zones, so you'll already have a feel for these — but it's worth spelling out what they mean in the context of a race.

Zone 1 is your very easy, conversational pace. You could hold a full conversation without any difficulty. Zone 2 is still comfortable, but you're working. Short sentences are possible, but you wouldn't want to chat at length. This is the zone where most of your long, easy training runs sit, and it's where you build your aerobic engine over time.

Zone 3 — tempo pace — is where things get properly challenging. You can manage a word or two, but conversation is essentially off the table. Most runners describe it as "comfortably hard." It's the effort you could sustain for roughly an hour if you had to.

Zone 4 and above are race-effort territory for shorter distances — the kind of intensity that leaves you breathless and isn't sustainable for long. For a 10k, most recreational runners will naturally drift into zone 3–4 depending on their fitness and the distance relative to their current ability.

Where You'll Likely Land on Race Day

Here's the reality — a 10k is a race, not a training run. Even if you set out intending to stay in zone 2, the excitement of race day, the other runners around you, and the natural adrenaline of competition will push your heart rate higher than your usual easy pace. That's completely normal and nothing to worry about.

For most beginner runners, 10k race pace sits somewhere between tempo pace and easy pace. The key question is: how long would it take you to cover 10 kilometres at your current tempo pace? Your tempo pace is broadly the effort you could sustain for about an hour. If a 10k is going to take you longer than an hour, you'll need to go a little slower than true tempo — otherwise you'll run out of steam before the finish line.

Conversely, if you're already covering 10k in under 55 minutes in training, your race pace will likely sit at or slightly above your tempo zone — and that's fine too. The Running Pace Calculator is a brilliant tool for working this out. If you know your current easy pace, you can plug in different 10k finish times and see which one corresponds to your training zones. For example: if your easy zone 2 pace is around 6:30 min/km, plugging in a 55-minute 10k gives you a race pace of about 5:30 min/km — meaningfully faster than easy, which makes sense for a race effort.

A Race Strategy Built Around Finishing Strong

Since this is your first 10k, Julia, I'd recommend letting go of zone targets on the day and racing by effort instead. Here's my suggested approach:

Start the first 2–3 kilometres feeling almost too easy. I know that's hard when there's race energy around you and everyone else seems to be flying — but hold back. The runners who go out hard in the first kilometre are often the ones you'll be passing at the 8k mark.

From 3k to 7k, settle into a rhythm that feels comfortably challenging. You're working, your breathing is deeper, but you feel in control. This is broadly your zone 2½ to zone 3 territory, though you don't need to watch your monitor obsessively — just run by feel.

The last 3 kilometres are where you can start to open up. If you've paced the first 7k well, you'll have something in the tank. There's nothing quite like passing people in those final kilometres — it's one of the best feelings in running. Finishing strong will also teach you more about your actual race capacity than any zone target could.

And here's the thing: since this is your first 10k, there's also absolutely nothing wrong with running the whole thing at a comfortable zone 2 effort and simply enjoying the experience. Completing the distance, soaking up the atmosphere, and crossing that finish line is the goal — not a time, not a zone.

Setting Future Targets After Your Race

Once you've got this race under your belt, you'll have real data to work with — and that's when the planning gets fun. A few tools I'd point you to:

The Goal Pace sessions are specific workouts designed to help you test the right race pace for different distances. Once you know your 10k time, you can run these sessions to dial in your target for the next race.

The Race Conversion Calculator lets you predict your pace for other distances based on your 10k result. If you're planning on running a half marathon later in the year — which it sounds like you are — this will give you a realistic target.

Best of luck this weekend, Julia. Go out a little easier than feels right, run your own race, and enjoy every kilometre of it. I hope it's a wonderful experience. :)

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