Direct answer
Can I prepare for my first half marathon in 10 to 12 weeks?
Ten to twelve weeks can be a preparation window for a first half marathon if you already run regularly and can comfortably manage the opening week. This plan assumes three runs and roughly 20 km per week for at least four weeks, including a comfortable 10 km long run. If you are starting from little or no running, build a base first and choose a later race.
Your first half marathon starts with the running you can already repeat comfortably. A race date cannot supply that base.
Check the starting point
Use this plan only if you have already completed at least four consistent weeks with:
- Three runs each week, separated by recovery days.
- Roughly 20 km or more across the week.
- A comfortable 10 km long run.
- No pain that changes your stride, and recovery that lets you repeat the week without persistent exhaustion.
These are the entry requirements for this particular framework. They are editorial choices, not universal scientific cutoffs.
Hal Higdon's novice plan also expects a runner to handle its first-week runs. For someone starting from little or no running, the NHS Couch to 5K plan provides an earlier step with running and walking, three sessions a week, and recovery days. Allow time beyond that to build a repeatable running base before beginning half-marathon preparation.
Keep the weekly pattern simple
Run on Tuesday, Thursday, and Sunday, or move those days while keeping a recovery day between runs. Monday, Wednesday, Friday, and Saturday can be rest days. If gentle walking or familiar easy cross-training helps you recover, keep it comfortable.
All listed runs are easy. You should be able to speak in complete sentences without forcing your breathing. Slow down or use planned walk breaks when needed. These distances do not require a target race pace, intervals, or a hard finish.
Keep familiar strength work modest if you already do it. Do not add a demanding new routine while the running increases.
The twelve-week framework
Read each line as Tuesday distance, Thursday distance, Sunday long run, then total running distance. Distances are in kilometers and include any walking breaks.
- Week 1: 5 km, 5 km, 10 km. Total 20 km.
- Week 2: 5 km, 5 km, 10 km. Total 20 km.
- Week 3: 5 km, 6 km, 11 km. Total 22 km.
- Week 4: 4 km, 5 km, 9 km. Total 18 km.
- Week 5: 5 km, 6 km, 12 km. Total 23 km.
- Week 6: 5 km, 6 km, 13 km. Total 24 km.
- Week 7: 4 km, 5 km, 11 km. Total 20 km.
- Week 8: 5 km, 6 km, 14 km. Total 25 km.
- Week 9: 5 km, 6 km, 15 km. Total 26 km.
- Week 10: 5 km, 6 km, 16 km. Total 27 km.
- Week 11: 4 km, 5 km, 10 km. Total 19 km.
- Week 12: 3 km, 3 km, then the 21.0975 km race. Pre-race training totals 6 km. With the race, the week totals 27.0975 km.
Weeks 4 and 7 reduce the workload. The final two weeks reduce training before race day. The schedule is a starting framework, and moving forward is optional when the next distance does not fit your recovery.
This framework is for adults with the stated running base. Record time on feet as well as distance. For a slower runner, a 16 km outing can be a much larger workload than the distance alone suggests. If the duration or recovery is substantially beyond your recent comfortable long runs, reduce the run and seek an adapted plan; do not force the listed distance to stay on schedule.
What ten weeks changes
Use twelve weeks as the default. A ten-week version begins at week 3 only if you already comfortably repeat that week's demands, including an 11 km long run, and have maintained the entry requirements for at least four weeks.
Skipping the opening weeks is appropriate only when you have already built that capacity. It is not permission to cram their distance into later weeks. If you have only ten weeks and do not meet the starting point, choose a later race or a shorter event.
Progress from what you actually ran
Do not treat a printed increase as automatically safe. A 2025 cohort study linked single-run distance spikes above a runner's recent longest run with increased overuse-injury rates. It does not validate one weekly percentage rule or certify the progression here.
This matters after a missed week. Your last completed long run may be shorter than the schedule assumes. Repeat a manageable week or reduce the next long run, and reassess the race date if that leaves too little time.
If you miss one easy run, skip it and continue only if recovery is normal. Do not combine it with the next run. If illness, pain, or a longer interruption affects training, pause the progression and get advice appropriate to the problem.
Judge readiness before the taper
After week 10, review the block rather than making the 16 km run into a time trial.
- Did you complete the recent weeks consistently?
- Was the long run controlled rather than an all-out effort?
- Did fatigue settle enough to resume normal training?
- Did pain, illness, or repeated missed runs change what you can tolerate?
- Have you practiced any walk breaks, fueling, and drinking you expect to use?
These questions support a decision; they do not constitute medical clearance. The race is another 5.0975 km beyond the longest run in this plan. That gap is a material limitation, especially if 16 km already pushed your recovery.
If the answers are uncertain, consider a later race, a shorter distance, or a run-walk plan you have practiced and that fits the organizer's cutoff. You do not need to run 21 km in training to prove a point in the final week.
Make race day a continuation
Start at a controlled effort and resist the pace of runners around you. Use the approach you practiced, including walking at planned points if that is your plan. Check the organizer's cutoff, aid details, and race-day forecast.
If pain changes your stride or symptoms worsen, stop and seek appropriate advice. Stop and seek urgent medical help for chest pain, fainting, or severe unusual breathlessness. The schedule is never a reason to continue through a medical concern.
Yigri can help keep the full training history visible. Look for a workload you have repeated and recovered from, instead of reading one faster run as proof that you are ready.
Methodology and limits
This is an original editorial training framework informed by a published novice coaching plan, NHS beginner-running guidance, and observational research on training-distance spikes. Its distances, starting criteria, recovery weeks, and readiness questions are editorial choices. No trial has validated this exact schedule or shown it makes every runner ready in twelve weeks.
- Beginner means new to the half-marathon distance here. This is not a couch-to-half-marathon plan or an injury-rehabilitation program.
- The starting requirements and weekly distances are editorial eligibility checks, not clinical thresholds or a guarantee of safe completion.
- A 21.0975 km race is substantially longer than the 16 km peak run here. Completing that run does not prove you can safely race the full distance.
- Keep or reduce the current workload when recovery is poor. A later race, a shorter event, or a planned run-walk approach may suit you better.
- If you have an ongoing medical condition, are returning after injury or illness, or are unsure about exercise readiness, discuss the plan with a qualified clinician.
- For slower runners, time on feet can rise substantially. Reduce or adapt a long run that exceeds your current capacity; do not force a distance to match the calendar.
