Generate a free first marathon training plan. 16-20 week program for beginners. Free marathon plan generator. No signup required.
Training for your first marathon requires 16-20 weeks of structured preparation — most first-timers are surprised by how manageable it is with the right plan. The key is progressive mileage increases never more than 10% per week, weekly long runs that peak around 20 miles, and proper taper before race day. Our generator creates your personalized 20-week plan.
Weeks 1-4: Build base mileage at 20-30 miles per week. Weeks 5-12: Progressive build at 30-45 miles per week with long runs reaching 16-18 miles. Weeks 13-16: Peak mileage at 45-55 miles per week with long run 20 miles. Weeks 17-18: Taper begins reducing mileage 20%. Weeks 19-20: Pre-race taper and race day.
Never increase weekly mileage by more than 10%. Every 4th week should be a recovery week with 20% reduction. Most first-marathon injuries come from increasing too fast, running too hard on easy days, and skipping recovery. The long run should be slow — conversational pace not race pace.
Most first-time marathon programs are 16-20 weeks. Starting from solid running base comfortable at 5-6 miles, 16 weeks is sufficient. Starting from minimal running, 20-24 weeks is recommended. Do not rush — injury from insufficient training is the most common reason people miss their first marathon.
Average first marathon finish time is 4-5 hours. The goal should be finishing comfortably not a specific time. Running coaches recommend training at conversational pace and targeting 30 seconds per mile slower than your training long run pace as your race goal.
You should comfortably run 20-25 miles per week and complete a 6-8 mile long run before starting a marathon plan. If not there yet, spend 6-8 weeks building base mileage first. Starting a 20-week marathon plan without adequate base is a major injury risk.
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