TLDR: You can run a half marathon in 6 weeks if you already have a base (comfortable running 4–5 miles and logging around 15 miles per week). Three runs a week is all you actually need. This plan tells you what to run, what to skip, and how not to wreck yourself in the process.
I signed up for a half marathon 43 days before race day. Not because I had a brilliant plan. Because a friend texted me at 11pm on a Tuesday and I said yes before I thought about it.
I’d been running consistently but not training. I was comfortable around 4 miles on any given Tuesday morning. I’d done a marathon two years prior, but I’d also taken a solid eight months off from anything that could be called structured training. Six weeks. 13.1 miles. Let’s go.
What I put together wasn’t revolutionary. It was stripped down to the minimum effective dose: three runs per week that actually build fitness without wrecking your joints or blowing up your schedule. I finished the race. I didn’t die. And I’ve since used the same basic structure with a few improvements.
Here’s what actually works.
Who This 6-Week Half Marathon Plan Is For
Let’s be honest about the prerequisites before you commit to this. A 6-week plan is not a couch-to-half-marathon program. That takes 12–20 weeks minimum and is a different conversation entirely.
This plan works if you:
- Can run 4–5 miles comfortably without stopping
- Are logging somewhere around 15–20 miles per week already, or were recently
- Have run a half marathon or longer before and have some time off (under 6 months)
- Are a 5K or 10K runner ready to move up
The cardiovascular base compresses fine into 6 weeks. What doesn’t compress is the connective tissue and bone loading. If your legs aren’t already somewhat used to running, 6 weeks is just enough time to hurt yourself. I’ll say it again: if you haven’t been running regularly, go find a 12-week plan. Come back to this one for the next race.
If you check those boxes, read on.
The Structure: 3 Runs Per Week, That’s It
Three runs. Every week. Not four, not five. Three.
This is the part that sounds too simple, but it’s the part that makes this sustainable for someone with a job, kids, a life. I have three daughters, a full-time engineering job, and a hockey league that absolutely does not care about my training schedule. Three runs a week fits. Five doesn’t.
The three runs each week are always the same types:
Tempo run. Sustained effort at roughly your 10K pace, or about 80–85% of your max effort. This is where your aerobic threshold gets built. It should be uncomfortable but controlled. You can talk, but you don’t want to.
Interval run. Short repeats at hard effort (roughly 5K race pace) with recovery jogs in between. These build speed and teach your body to clear lactate. You’ll hate these and also feel great when they’re done.
Long run. Slow and easy. Conversational pace. This is the most important run of the week and the one most people sabotage by running too fast. If you’re huffing and puffing, you’re going too hard.
That’s the whole framework. The week-to-week plan just adjusts the distances.
The 6-Week Half Marathon Training Plan
Each week follows the same pattern: tempo on Tuesday (or your equivalent middle-of-week day), intervals on Thursday, long run on the weekend. Move the days around to fit your life. Just keep at least one rest or easy day between each run.
Week 1: Get Your Legs Under You
- Tempo: 3 miles at 10K pace
- Intervals: 4 x 800m at 5K pace, 90 sec rest between
- Long run: 6 miles easy
This week shouldn’t feel crushing. You’re not trying to peak on day one. Get the legs moving, shake off whatever rust is there, and nail the long run at an honest easy pace.
Week 2: Start Building
- Tempo: 4 miles at 10K pace
- Intervals: 5 x 800m at 5K pace, 90 sec rest
- Long run: 8 miles easy
Week two is where a lot of people first feel the half marathon distance becoming real. Eight miles isn’t huge, but it’s enough to know if your easy pace is actually easy.
Week 3: First Real Load Week
- Tempo: 4 miles with a 1-mile hard finish (pick it up the last mile to 5K effort)
- Intervals: 4 x 1200m at 5K pace, 2 min rest
- Long run: 9 miles easy
This is the week where you’ll want to take shortcuts. Don’t. The 9-mile long run is doing real work. Eat before it, run it slow, and don’t cut it at 8.
Week 4: Peak Week
- Tempo: 5 miles at 10K pace
- Intervals: 5 x 1200m at 5K pace, 2 min rest
- Long run: 10–11 miles easy
This is the hardest week. The interval session is going to be brutal. The long run the weekend after will feel like a lot. That’s normal. Trust the process and don’t panic. Some weeks in training just feel like garbage.
One thing worth knowing: you’ll never run 13.1 miles in training on this plan. Your longest run is 10–11 miles. That gap gets closed by race day adrenaline, the crowd, and the taper. I’ve seen this play out too many times to argue with it.
Week 5: Back Off
- Tempo: 3 miles easy/moderate (not hard tempo; this is a down week)
- Intervals: 3 x 800m at 5K pace, easy
- Long run: 7 miles easy
Cut the mileage significantly. This is intentional. Your body is absorbing the work you did in weeks 3 and 4. Rest is training. Shorter doesn’t mean easier to force yourself to do. A lot of people blow up week 5 by making it another peak week because they feel good. Don’t.
Week 6: Race Week Taper
- Tuesday: 3–4 miles easy, strides at the end (6 x 20 sec fast with full recovery)
- Thursday: 2 miles very easy, just to shake out the legs
- Race day: 13.1 miles. You’ve done the work.
Race week is not training. You’re not building anything. The work is done. Your job this week is to stay loose, stay off your feet as much as reasonable, eat normally, sleep well, and don’t do anything stupid like try a new food the night before.
What to Do on Non-Running Days
I’m a hybrid athlete (I lift and run), so I get asked this a lot. Here’s the honest answer:
Strength train 1–2 days per week on your non-running days. Short sessions are fine. 20–30 minutes of compound movements (squats, deadlifts, lunges, hip hinges, single-leg work) will do more for your running than a sixth cardio day. Strong hips and glutes are genuinely protective against the overuse injuries that derail a short training block like this.
One full rest day per week is non-negotiable. This isn’t soft. It’s how connective tissue repairs. Sleep is non-negotiable too. If you’re choosing between sleeping an extra 45 minutes and getting a run in before the kids wake up, take the sleep during a heavy training week.
What I Got Wrong My First Time Through
I ran my long runs too fast. Every single week. I thought easy pace meant “easy for someone in better shape.” It means conversational. It means you could call your mom and actually carry on a conversation. I consistently ran 60–90 seconds per mile too fast, accumulated fatigue I didn’t need, and felt destroyed going into race week.
I also skipped the strides in taper week. Strides feel weird and unnecessary when you’re trying to rest. They’re not. They keep your fast-twitch fibers primed without adding fatigue. Six 20-second accelerations on Tuesday and Thursday of race week and your legs will feel better on the start line. I ran my second race using this plan with strides. Night and day.
Race Day Pacing
Start slower than you think you need to. Everyone says this. Almost nobody does it. The first two miles will feel effortless (the crowd energy, the adrenaline, the taper legs) and you’ll be tempted to bank time. Don’t. That time you “banked” will get withdrawn with interest around mile 9.
A rough target: run miles 1–6 about 10–15 seconds per mile slower than your target pace. Miles 7–10 at target. Miles 11–13.1 you run however fast your legs will carry you.
If you’ve been consistent in training and your long runs felt manageable, you have a finish line. The last two miles hurt for everyone. That’s the race.
If You’ve Already Done the Marathon Thing
If you’ve already trained for a full marathon and are looking to add half marathons to the rotation, a lot of this translates directly. The three-run structure holds up well as a long-term framework. I’ve written about how I balance marathon training around three kids and a full schedule, and a lot of the same logic applies here, just compressed.
And if you’re using this plan as a stepping stone toward a full marathon, the habit of training on a realistic schedule (not an aspirational one you’ll abandon by week 3) is the actual skill being built. That carries over.
The Bottom Line on 6 Weeks
Six weeks is tight. It’s not ideal. The best time to start a half marathon training plan is probably 12 weeks out. But 6 weeks is a real training block if you’re already fit, and doing it right beats doing nothing or following a plan you can’t actually execute.
Three runs per week. Long run is king. Tempo and intervals build the engine. Rest days are mandatory, not optional. Strides in race week. Start slower than your ego wants on race day.
Pick a race. Sign up now. Figure out the rest.
Personal disclaimer: I’m a runner and a coach-less amateur. This isn’t medical advice. If you have a history of injury or haven’t run consistently, please don’t use a 6-week plan. Go longer and go smarter.