A 16-Week Marathon Training Plan for Your First 42.2K
This plan is for a first marathon, not a fast one. The goal is finishing strong and staying injury-free, not chasing a specific time. It assumes you can currently run a half marathon distance, or close to it, and have a running base of at least 15-20 km a week. If you're newer than that, start with a half marathon first, and come back to this once that's behind you.
How this plan is structured
Four to five runs a week, with the long run as the clear centrepiece. Unlike shorter distances, marathon training success is mostly about accumulated weekly volume and the long run building safely over months, not about workout intensity. There's exactly one 32 km long run in this plan, most first-timer plans don't need to go further than that.
The plan, phase by phase
| Weeks | Phase | Long run range | Weekly volume | Focus |
|---|---|---|---|---|
| 1-4 | Base building | 12-16 km | 25-35 km | Consistency, easy pace |
| 5-8 | Endurance | 16-22 km | 35-45 km | Long run progression |
| 9-12 | Peak volume | 24-30 km | 45-55 km | Longest runs, race-pace segments |
| 13 | Peak long run | 32 km | ~55 km | One final big effort |
| 14-16 | Taper | 16 km down to 0 | 40 km down to ~15 km | Recovery, race prep |
Why the peak long run is 32 km, not 42
You don't need to run the full marathon distance in training to finish it on race day, and trying to do so adds injury risk without a proportional benefit. A 32 km long run, done 3 weeks before race day, builds enough endurance and mental confidence that the final 10 km on race day is genuinely new ground but not unknown territory. What gets you through those last 10 km is the accumulated fitness of the whole 16 weeks, not any single long run.
Fuelling your long runs matters as much as running them
Any long run past 90 minutes needs fuel during the run, not just before and after. Practice your race-day nutrition strategy on long runs from week 9 onward, how to fuel a marathon covers what and when. Race day is never the right time to try a new gel, drink, or fuelling schedule for the first time.
Trust the taper
Three weeks is a longer taper than most shorter-distance plans use, and that's deliberate. The marathon's demands on your body accumulate over months, and it takes longer to fully absorb that training and arrive at the start line fresh. Cutting the taper short to fit in one more big week is one of the most common ways first-time marathoners undo months of good training in the final stretch.
16 weeks from today puts you close to race day. Find one that fits.
Browse marathonsThe organizers I've spoken with who track DNF (did not finish) rates consistently see the same pattern: it's rarely the runners who trained the least who don't finish, it's the ones who trained hardest in the final two weeks, trying to bank fitness that doesn't actually bank that way. If you're tempted to add a long run in week 15, that instinct is exactly what this plan's taper exists to override.
Frequently asked questions
What if I miss a week of training due to illness or travel?
One missed week in a 16-week plan is rarely a problem, resume where the schedule currently is rather than trying to make up lost mileage. Two or more consecutive missed weeks in the base or endurance phase may mean shifting your peak long run back by a week rather than compressing the buildup.
Do I need to run a marathon-pace segment in training?
It helps but isn't essential for a first-timer whose main goal is finishing. If you want to include it, add 5-8 km at your target marathon pace inside one long run every two weeks during the peak volume phase, not more often than that.
How many rest days does this plan include?
Two per week throughout, non-negotiable ones. Marathon training injuries usually come from accumulated fatigue, not any single hard run, and rest days are where the adaptation from training actually happens.
Should I taper my diet along with my mileage?
Not your overall eating, but your carbohydrate intake typically increases slightly in the final 2-3 days before race day as your mileage drops. [[Carb loading explained|/blog/carb-loading-explained]] covers how to do this without overdoing it.