Half Marathon
The half marathon is the distance where joggers become runners. With 2.1 million finishers annually in the US, it's the preferred distance for 35% of runners — demanding enough to require a real training plan (12-16 weeks), short enough to be achievable within a single season. The 13.1-mile distance builds genuine aerobic endurance and teaches race-day pacing, nutrition, and mental toughness that carry into every longer challenge.
The half marathon is the distance where joggers become runners. With 2.1 million finishers annually in the US, it's the preferred distance for 35% of runners — demanding enough to require a real training plan (12-16 weeks), short enough to be achievable within a single season. The 13.1-mile distance builds genuine aerobic endurance and teaches race-day pacing, nutrition, and mental toughness that carry into every longer challenge.
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What Makes This Hard
The Real Challenge
13.1 miles takes most first-timers 2.5-3 hours on their feet — this is a duration challenge, not a speed challenge. By mile 10, your legs teach you something about glycogen depletion that no article can explain. The hardest part of training is weeks 10-14 when the long runs hit 10+ miles and the cumulative fatigue becomes real.
Where People Struggle
Skipping long runs and underestimating recovery time between them. Race-day adrenaline makes people start 30-45 seconds per mile too fast, which leads to hitting the wall at mile 9-10. Proper pacing in the first 4 miles is everything.
Key Numbers
- Distance
- 13.1 miles (21.1km)
- Training
- 12-16 weeks
- Typical finish
- 2:15-3:00 hr
- Longest training run
- 10-11 miles
Gear Essentials
- Running shoes with at least 300 miles left on them (replace race-day shoes)
- Race-day nutrition: gels or chews starting at mile 4, every 45 min — practice these in training
- GPS watch with pace alerts to stop yourself going out too fast
- Anti-chafe products on all contact points
- Hat and sunscreen for morning races
Terrain & Conditions
Road races on paved courses, mostly flat with occasional rolling hills. Some trail half marathons add significant elevation. Weather is a major factor — check the forecast and dress in layers you can tie around your waist.
How Half Marathon Compares
- Harder than
- 10K Race
- Comparable to
- Metric Century (cycling equivalent in terms of duration and endurance)
- Easier than
- Marathon
Practical Logistics
- Best time to go
- Spring (April-May) or autumn (September-October)
- Permit / registration
- None — events are fully organized
- Getting there
- Major races in every large city; local options everywhere
- Accommodation
- Often a weekend trip for destination races like Brooklyn Half or Great North Run
- Typical cost
- $65-120 entry; destination races $100-200+
- Guide
- Self-guided; structured training plans are free online
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Part of a progression
Path to a Marathon
Step 3 of 426.2 miles built mile by mile — the classic endurance progression for runners at any level.
The halfway mark reveals everything: pacing, nutrition, mental grit. Fix it here.
Next step adds: Peak weekly mileage · 26.2-mile execution · Months of consistent training
View full path