20-Week Valencia Marathon Training Plan

The 2026 Valencia Marathon is scheduled for December 6, 2026, so the 20-week window opens around July 19, 2026. Treat that as the outside edge of the window, then line week one up with the plan's normal weekly rhythm.

Use the longer window to make the early build calmer, not to add five months of hard training. The plan should begin close to your current load, hold most running easy, and delay the biggest race-specific work until the middle of the cycle. The course does not change the opening load you can handle, so choose from your current mileage and recent longest run before adding race-specific terrain.

Build general durability first. Add the race's hills, flat sustained running, downhill exposure, heat, or humidity in layers after the weekly rhythm is stable, then make the final long runs the most course-specific. Train even pacing until it's boring. Valencia is the rare course where your finishing time is almost purely a function of fitness and discipline: no hills to blame, usually no weather to blame. Long runs with extended goal-pace segments are the single highest-value session in your buildup.

Do not double weeks or cram missed mileage into the remaining calendar. Use your current mileage, recent longest run, experience, goal, and available days to choose a plan that can enter at an appropriate point while preserving the taper.

Most Stride marathon plans run 12 to 20 weeks, and a December race gives you an ideal fall buildup. Get matched in the app and Stride maps every week from today to the blue carpet.

Yes. The course is one of the flattest anywhere, December conditions are usually cool and calm, and the field is stacked with runners chasing times, meaning you'll have company at every pace. Personal bests are the house specialty.