Half Marathon Training Plan for Intermediate Runners: 10 Weeks to Race Day

An intermediate half marathon training plan typically runs 10–14 weeks, peaks at 40–50 miles per week, and assumes you can already run 6–8 miles comfortably. If you've finished a half before and want to actually race it—not just survive it—this is the structure that works.

What "Intermediate" Actually Means for Half Marathon Training

Before picking a plan, be honest about where you are. Intermediate doesn't mean "I've run a few 5Ks." For half marathon purposes, intermediate means:

• You can run 6 miles continuously without walk breaks
• Your current weekly mileage is somewhere between 20–35 miles
• You've completed at least one half marathon or have been running consistently for 12+ months
• You understand the difference between easy and hard effort

If you're sub-20 miles per week, start with a beginner plan and build a base first. Running more miles on insufficient aerobic foundation is how people end up injured at week 6.

The intermediate label also implies a time goal. You're not running to finish—you're targeting something. Common intermediate benchmarks: sub-2:00, sub-1:50, or a personal best off a previous race. Your target time determines your training paces, which is where Jack Daniels' VDOT system becomes useful.

How to Set Your Training Paces Using VDOT

Pace zones for half marathon training aren't arbitrary. Jack Daniels' VDOT framework ties your recent race performance to specific training intensities—easy, marathon pace, threshold, interval, and repetition.

Here's a practical example. Say your recent 10K time is 52:00. That gives you a VDOT of roughly 42. From there:

• Easy pace: 10:30–11:15 min/mile
• Tempo (threshold) pace: 9:00–9:15 min/mile
• Half marathon goal pace: ~9:30 min/mile (targeting ~2:04)
• Interval pace (VO2max): 8:30–8:45 min/mile

The most common mistake intermediate runners make is running their easy days too fast. If your easy runs feel comfortable enough to hold a conversation but you're pushing 8:30 pace, you're not running easy—you're accumulating fatigue that compounds by week 8. Easy means easy. That's 60–75% of max heart rate, not "I could technically talk if I had to."

Pacenotes calculates VDOT-based pace zones automatically from your recent race times, so you're not guessing at these numbers on workout days.

The 10-Week Intermediate Half Marathon Training Structure

Here's a weekly framework designed around 4–5 runs per week, peaking around week 8 before a two-week taper.

Weekly Template

The Long Run Progression

This is the spine of your plan. For an intermediate runner, long runs should build from 8 miles up to a peak of 12–13 miles, then taper back.

A 10-week long run progression might look like:

Weeks 1–3: 8, 9, 7 (cutback) Weeks 4–6: 10, 11, 8 (cutback) Weeks 7–8: 12, 13 Weeks 9–10: 9, Race (13.1)

Cutback weeks aren't optional—they're where adaptation happens. Increasing mileage by more than 10% week-over-week without planned recovery is a reliable path to a stress fracture or IT band trouble.

Quality Workouts: Tempo and Intervals

Two types of hard sessions matter most for the half marathon:

Tempo runs: 20–40 minutes at threshold pace (roughly your 1-hour race pace). These build the lactate clearance that lets you hold goal pace for 13 miles. Example: 2-mile warm-up, 4 miles at threshold, 1-mile cool-down.

VO2max intervals: Shorter, harder repeats that raise your ceiling. Example: 6 × 800m at interval pace with 90-second jogs between. Don't do these more than once a week—two hard sessions weekly is enough for most intermediate runners.

How to Structure Your Taper Without Losing Fitness

The taper is two weeks, not five days. Most runners taper too little and arrive at the start line still carrying accumulated fatigue. The research on tapering is consistent: a 20–25% reduction in weekly mileage over two weeks, while maintaining intensity, preserves fitness and reduces fatigue.

Week 9: Drop total mileage to about 65% of your peak week. Keep one tempo session but shorten it. Long run goes down to 9 miles.

Week 10 (race week): Easy runs only, 3–4 miles each. One short set of race-pace strides two days before the race to remind your legs what fast feels like. Nothing hard after Tuesday.

One common taper mistake: filling the time you'd normally spend running with anxiety and extra miles "just to stay sharp." The fitness is already built. The taper is about arriving rested, not arriving more fit.

Race Pace Strategy for Intermediate Half Marathon Runners

Negative splitting—running the second half slightly faster than the first—is statistically the strategy most associated with personal bests. For an intermediate runner, "slightly" means 5–10 seconds per mile faster in the second half, not a dramatic surge.

Practical race day math: if your goal is 1:50:00, that's 8:23 per mile average. Consider running miles 1–7 at 8:28–8:30, then easing into goal pace from mile 8 onward if you feel good. The first 5 miles of a half will always feel easy on race day adrenaline. That's precisely when not to trust the feeling.

Elevation matters too. If your course has significant climbs, use effort-based pacing rather than strict pace targets. A 9:00 mile uphill at the same effort as an 8:20 mile on flat isn't a problem—it's correct execution.

Strength and Injury Prevention for the Intermediate Runner

Mileage alone doesn't fix running economy or prevent injury. Two sessions of 15–20 minutes of strength work weekly makes a measurable difference by race day.

Focus on:

• Single-leg squats and Bulgarian split squats: quad and glute strength that directly transfers to running economy
• Hip hinge patterns (deadlifts, Romanian deadlifts): posterior chain strength, critical for late-race form
• Calf raises (slow, weighted): the most underrated injury prevention tool for runners; Achilles and plantar issues are often preceded by months of weak calves
• Side-lying hip abduction: keeps the glute medius doing its job, which keeps your knees tracking properly

Don't add these in week 1 if you're already at 35 miles per week. Introduce them in the first two weeks and keep the loads moderate. Sore legs on long run day defeats the purpose.

Your training data and workout history are worth tracking precisely over 10 weeks—if you want paces auto-calculated and a plan that adjusts based on how training is actually going, Pacenotes does that on iOS.