Half Marathon Training Plan: 12 Weeks for First-Timers

Thirteen-point-one miles sounds like a lot until you break it into 12 weeks of manageable work. A solid half marathon training plan can be the difference between finishing strong and grinding through the last few miles wondering what went wrong. If you've never run a half before, this guide is built for you.

This isn't a plan for elite athletes. It's for comeback runners who haven't run consistently in years, busy parents who can carve out three or four sessions a week, and former athletes who want to train with purpose again. You don't need a coach. You don't need expensive gear. You need a plan you'll actually follow.

Here's the 12-week framework, week by week, plus the principles that make it work.

Before You Start: What This Plan Assumes

You can run or run-walk 2 to 3 miles without stopping. That's it. If you can cover 2 miles at any pace, you're ready for week one.

This plan builds mileage gradually, peaks around week nine, then tapers before race day. Three run days per week is the baseline, with an optional easy fourth day in some weeks. Rest days are not optional.

If you have a medical condition, haven't exercised in a long time, or are dealing with pain or an injury, check with your doctor before starting.

One more thing: this plan works better when you're running with other people at least once a week. More on that later.

The Core Principles Behind the Plan

Run Easier Than You Think You Should

Many first-time half marathoners run their easy days too hard. The result is accumulated fatigue that makes the long run feel terrible and makes skipping it feel justified.

Easy means conversational. You should be able to speak in full sentences. If you can't, slow down. Run-walk intervals count. A 14-minute mile you finish beats a 10-minute mile that breaks you.

The Long Run Is the Week

The other runs in the week support Saturday's long run. Midweek runs build aerobic base and keep your legs moving. The long run is where your body learns what 13.1 miles actually feels like.

Protect it. Don't skip it for a shorter run. Don't push the pace. Just cover the distance.

Mileage Increases Slowly

You'll often hear the "10 percent rule" for weekly mileage. It's a handy rule of thumb, but it isn't magic: a randomized trial of 532 novice runners found that a slower, 10-percent-based build didn't lower injury rates compared with a standard program. This plan builds in modest steps, mostly by adding to the long run, and includes a recovery week. Weeks that feel too easy aren't wasted; they give your tendons and joints time to catch up to your heart and lungs.

Recovery Is Training

Sleep, nutrition, and rest days are part of the plan. The CDC recommends at least 7 hours of sleep a night for adults, and that matters even more when your training load is climbing.

The 12-Week Half Marathon Training Plan

Weeks 1 to 3: Build the Base

The goal in the first three weeks is consistency, not mileage. You're building the habit of showing up three times a week.

Week 1

• Monday: Rest
• Tuesday: 2-mile easy run or run-walk
• Wednesday: Rest or 20-minute walk
• Thursday: 2-mile easy run
• Friday: Rest
• Saturday: 3-mile long run (easy pace)
• Sunday: Rest or light stretching

Week 2

• Tuesday: 2.5 miles easy
• Thursday: 2.5 miles easy
• Saturday: 4-mile long run

Week 3

• Tuesday: 3 miles easy
• Thursday: 3 miles easy
• Saturday: 4.5-mile long run

By week two or three, your long run is about the distance of a GRYT Run Club Saturday on the Montour/Peters Trail, roughly 4 miles out and back. Four miles is a real distance. Finishing it with other people, then standing around the parking lot with coffee, is one way the habit sticks.

Weeks 4 to 6: Build Aerobic Confidence

Mileage increases, and you add one midweek run that's slightly longer than the others. This is where the aerobic engine starts to develop.

Week 4

• Tuesday: 3 miles easy
• Thursday: 3.5 miles moderate
• Saturday: 5-mile long run
• Optional Sunday: 2-mile recovery jog

Week 5

• Tuesday: 3 miles easy
• Thursday: 4 miles moderate
• Saturday: 6-mile long run

Week 6: Recovery Week

• Tuesday: 3 miles easy
• Thursday: 3 miles easy
• Saturday: 4-mile long run (easy, no pressure)

Week 6 is a recovery week. Total mileage drops by roughly a quarter. This is intentional: a lighter week gives your body a chance to absorb the previous weeks of work before the bigger build. Skipping it to keep building is a common first-timer mistake.

Weeks 7 to 9: Build Toward Race Distance

This is the hardest block. Long runs climb toward double digits. Midweek runs start to feel like real training. This is where most first-timers either find their stride or start skipping runs.

Week 7

• Tuesday: 4 miles easy
• Thursday: 4 miles with the last mile at a slightly faster effort
• Saturday: 7-mile long run

Week 8

• Tuesday: 4 miles easy
• Thursday: 5 miles moderate
• Saturday: 9-mile long run

Week 9: Peak Week

• Tuesday: 4 miles easy
• Thursday: 5 miles moderate
• Saturday: 10 to 11-mile long run

The peak long run is 10 to 11 miles, not 13.1. Many beginner plans stop short of the full distance in training, and the taper plus race-day energy help carry you the rest of the way. There's no need to prove you can run 13 miles before race day.

Weeks 10 to 12: Taper and Race Prep

The taper isn't a reward. It's the last phase of training. Your body is recovering and getting ready for a big effort. Cut mileage, but keep running regularly.

Week 10

• Tuesday: 4 miles easy
• Thursday: 4 miles easy
• Saturday: 8-mile long run

Week 11

• Tuesday: 3 miles easy
• Thursday: 3 miles easy
• Saturday: 6-mile long run

Week 12: Race Week

• Monday: Rest
• Tuesday: 2 to 3 miles easy, no effort
• Wednesday: Rest
• Thursday: 2 miles easy, just to shake out the legs
• Friday: Rest
• Saturday or Sunday: Race day

What to Do on the Days Between Runs

Rest days aren't zero-effort days. Light walking, mobility work, and foam rolling keep your legs moving without adding training stress. A 20-minute walk on a rest day isn't cheating. It's recovery.

Strength work helps too. A 2014 meta-analysis in the British Journal of Sports Medicine found that strength training programs cut sports injuries to less than a third across the trials it reviewed. Two short sessions per week of bodyweight moves like lunges, step-ups, bridges, and calf raises is a practical target. You don't need a gym.

Sleep matters more than any single run. If you're choosing between an extra hour of sleep and squeezing in a short midweek run, sleep wins.

Fueling for Long Runs

Most runners don't need gels or sports drinks for runs under about an hour. For longer runs, many runners feel better taking in some easy carbohydrates along the way, like an energy chew, a gel, or a few dates. Experiment during training, not on race day.

Start your long runs well hydrated. Drink water consistently the day before, and don't try to catch up on race morning. On warm days or longer runs, carry water or plan a route with a water stop.

Post-run nutrition is easy to overlook. A real meal with carbohydrates and protein after a long run helps you refuel. A breakfast sandwich works. So does oatmeal with eggs on the side. For more on pre-run food, see what to eat before a run.

The Gear You Actually Need

Shoes that fit well and have enough life left in them. That's the non-negotiable. The American Academy of Podiatric Sports Medicine suggests replacing a typical running shoe every 350 to 500 miles. If yours are already near that range, get a new pair early in the plan so they're broken in by race day.

Moisture-wicking socks help prevent blisters. Cotton socks hold sweat and make blisters more likely.

If any of your midweek runs happen in the dark, wear a light and reflective gear. A headlamp or chest light and a clip-on rear blinker cover the basics. The night running safety guide has more.

Everything else (GPS watches, heart rate monitors, compression sleeves) is optional. Useful, but optional.

Running With a Group Makes This Easier

Training plans are easier to stick with when someone expects you to show up.

The Saturday long run is the hardest run to skip. It's also the one that matters most. Having people expecting you at a specific time and place at 7 AM changes the calculus. You don't have to feel motivated. You just have to show up.

GRYT Run Club meets every Saturday at 7:00 AM on the flat, paved Montour/Peters Trail in McMurray, covering about 4 miles out and back. No pace requirement. No membership fee. It's no-drop: the run ends when the last person finishes, and faster runners loop back. That matters when you're in week eight and the long run feels harder than it should.

If you're aiming for the UPMC Health Plan Pittsburgh Half Marathon on Sunday, May 2, 2027, start this plan the week of February 8, 2027. In the early weeks, the GRYT Saturday distance covers most or all of your long run. As the long run grows, run the group miles and add the rest before or after on the same trail. Then get coffee in the parking lot.

First-timers can RSVP on the homepage and sign a short waiver. If you want a plan tailored to your own schedule, try the free run plan builder.

Common Mistakes First-Timers Make

Running the easy days too fast. Already covered this, but it's worth repeating because it's the most common error. Easy is easy.

Skipping the recovery weeks. They're in the plan for a reason. Trust them.

Doing too much in the last two weeks. The taper is real. The fitness you've built doesn't disappear in two weeks of reduced mileage. Let your legs freshen up.

Wearing new gear on race day. Race day is not the time to test new shoes, new socks, or new shorts. Wear what you trained in.

Going out too fast. The first two miles of a half marathon feel easy. They're supposed to. Run them at goal pace or slower. The back half is where the race gets decided.

A Note on Pace

This plan doesn't prescribe a pace because pace is the wrong thing to focus on for a first-time half marathon. The goal is finishing. The goal is crossing the line knowing you trained consistently for 12 weeks and ran the race you prepared for.

If you want a rough, conservative time goal, use your comfortable long run pace. At 11 minutes per mile, 13.1 miles takes about 2:24. At 13 minutes per mile, it's about 2:50. Many runners end up a bit faster on race day, but finishing at your long run pace is a solid first goal. A pace calculator makes the math easy.

A healthy 2:50 finish after 12 consistent weeks is a better outcome than a faster goal you chased into an injury.

Frequently Asked Questions

Can I start this plan if I've never run more than a mile? Build up to 2 to 3 miles first with a few weeks of easy run-walk intervals, three days per week. The plan assumes a 2-mile base, not zero. The build a running base guide can help.

What if I miss a run? Skip it and move on. Don't try to make it up by doubling the next run. One missed run doesn't derail 12 weeks of training. A compensatory overload run might.

Do I need to run the optional day? No. Three days is the baseline. The optional day is for runners who feel recovered. If you're sore or tired, it's a rest day. Pain that doesn't settle with rest is worth a visit to a doctor or physical therapist.

What should I eat before the long run? Something familiar, easy to digest, and carbohydrate-forward. Toast with peanut butter, a banana, oatmeal with a little protein. Eat 60 to 90 minutes before you run. Don't try anything new on long run day.

How do I know if I'm running too easy? You should be able to hold a conversation. If you're breathing too hard to speak in full sentences, slow down until you can.

What if my long run pace is much slower than my race goal pace? That's normal. Long runs are meant to be easy and conversational, not race pace. Running every long run at race pace adds a lot of fatigue. Save the faster effort for race day.

Can I use this plan for the Pittsburgh Half Marathon? Yes. The 2027 Pittsburgh Half Marathon is Sunday, May 2, 2027. Start the plan the week of February 8, 2027, and race week lands on schedule. Saturday GRYT runs line up with the plan's long run days; on longer weeks, add miles before or after the group run. Check the race website for registration details.

Twelve weeks is enough time for many first-timers to go from 2 miles to 13.1. Not because it's easy, but because the plan makes each week manageable. Show up three times a week. Run the long run. Rest when the plan says rest.

The fitness compounds.

That is the work.