How Long Does It Take to Train for a Half Marathon?

Quick Answer

Training for a half marathon takes 8–12 weeks if you already run regularly and 12–16 weeks if you are starting from a lower fitness base. Most training plans assume you can comfortably run 3–4 miles before beginning.

Training Timeline by Experience Level

Experience Level	Training Duration	Starting Base	Weekly Runs
Complete beginner	16–20 weeks	Can walk 30 minutes	3–4 runs/week
Casual runner	12–16 weeks	Can run 2–3 miles	3–4 runs/week
Regular runner	8–12 weeks	Can run 5–6 miles	4–5 runs/week
Experienced racer	8–10 weeks	Can run 8+ miles	4–6 runs/week

If you cannot yet run 3 miles without stopping, add a 4–8 week base-building phase before starting a formal half marathon plan.

Typical Training Plan Structure

Most half marathon plans include four types of runs each week:

• Easy runs – 2–3 short runs at a conversational pace. These build aerobic fitness without excessive stress.
• Long run – One weekly run that gradually increases in distance. This is the cornerstone of your training and teaches your body to handle the race distance.
• Tempo or speed work – One run at a faster-than-easy pace to improve lactate threshold and race-day speed.
• Rest or cross-training days – 1–2 days per week for recovery, walking, cycling, swimming, or yoga.

Weekly Mileage Progression

Training Week	Weekly Mileage	Long Run Distance
Weeks 1–4	12–18 miles	4–6 miles
Weeks 5–8	18–25 miles	7–9 miles
Weeks 9–12	22–30 miles	10–12 miles
Taper (final 2 weeks)	15–20 miles	6–8 miles

The general rule is to increase your weekly mileage by no more than 10% per week to avoid injury. Every 3–4 weeks, include a cutback week where you reduce mileage by 20–30% to let your body recover.

The Taper Period

The final 2–3 weeks before race day are called the taper. During this phase you reduce mileage by 30–50% while maintaining intensity. The taper allows your muscles to fully recover and glycogen stores to replenish so you arrive at the start line feeling fresh and strong.

It is normal to feel sluggish or anxious during the taper. Trust the training you have already done.

Nutrition and Fueling

• During training – Increase carbohydrate intake on days before and after long runs. Stay hydrated throughout the week.
• Long runs over 60 minutes – Practice fueling with energy gels, chews, or sports drinks. Find what works for your stomach before race day.
• Race week – Carb-load moderately 2–3 days before the race. Avoid trying new foods the night before.

Common Mistakes to Avoid

• Running too fast on easy days – Most of your training should be at a pace where you can hold a conversation.
• Skipping the long run – The long run is the most important workout of the week.
• Increasing mileage too quickly – Jumping from 15 to 25 miles per week is a recipe for shin splints, IT band issues, or stress fractures.
• Neglecting strength training – Two 20–30 minute sessions per week focusing on glutes, hips, and core significantly reduce injury risk.
• Not testing race-day gear – Wear your race shoes and clothing on training runs to avoid blisters and chafing.

Practical Tips

• Sign up for a race 12–16 weeks out to create accountability and a firm training deadline.
• Run your long run at 60–90 seconds per mile slower than your goal race pace.
• Your longest training run should be 10–12 miles; you do not need to run the full 13.1 miles before race day.
• Join a local running group or use an app like Strava for motivation and pacing guidance.