16-Week Jacksonville Marathon Training Plan

Jacksonville, FLDecember 12, 2026

Start around August 22, 2026. The calendar below gives each phase a real date, then the course guidance shows where to make the build specific to Jacksonville Marathon.

The Jacksonville Marathon is about as flat as a road marathon gets. The entire course sits between roughly 5 and 29 feet above sea level, with about 219 feet of cumulative climb and 220 feet of descent across all 26.2 miles, which nets out to a single foot. It is run as an out and back in mid December, and 703 people finished it in 2025.

Race day
December 12, 2026
Start window
August 22, 2026
Runway
16 weeks
Course
Very Flat · Out and Back
Plan choice
Current training

Does this window fit your starting point?

Use this window when you have a running base and want several weeks before the hardest marathon-specific work begins. The extra month over a 12-week plan creates more room for gradual long-run growth and recovery.

  • You run consistently enough that week one is a continuation, not a restart.
  • You want a distinct foundation phase before the biggest long runs.
  • You can protect your planned run days for roughly four months.
  • Your race date leaves the full window without forcing skipped weeks.

The 16-week Jacksonville Marathon calendar

These dates define the job of each phase. Your current mileage, recent longest run, experience, goal, and available days still decide the actual workouts inside them.

Foundation

Weeks 1–4

Aug 23, 2026–Sep 19, 2026

Establish repeatable weeks, keep most running easy, and begin extending the long run without forcing the pace.

Build

Weeks 5–10

Sep 20, 2026–Oct 31, 2026

Increase the weekly load, preserve step-back weeks, and introduce the terrain and effort the race will require.

Peak

Weeks 11–13

Nov 1, 2026–Nov 21, 2026

Complete the biggest race-specific weeks and use long runs to lock in fueling, pacing, and equipment.

Taper

Weeks 14–16

Nov 22, 2026–Dec 12, 2026

Bring volume down while keeping the weekly rhythm familiar. Training is finished before race week begins.

Make the window specific to Jacksonville Marathon.

Use the first month to establish consistency, then make long runs progressively more specific to the race's terrain and conditions. The course rehearsal should grow with the plan, not appear all at once in peak week.

Read the full race guide

How to train for the Jacksonville Marathon

Train for the Jacksonville Marathon the way you would train for a track race stretched out over 26 miles: even effort, even cadence, no surges. With 24 feet of vertical range there is no terrain to force a change of gear, so your long runs should be flat, continuous, and run at a pace you could hold for another 45 minutes when you finish. Practicing restraint is the workout.

The specific cost of flat ground is repetition, not effort. Same muscles, same joint angles, same footstrike, for the entire race. Build a strength routine that covers what the course will not: single leg loading, calf and soleus work, and some hill or stair repeats even though the race has none, purely so your legs have been asked to do something else recently.

Then plan around the calendar. A December race means your build runs through late summer and autumn, and race morning in Jacksonville is usually humid even when it is cool. Do a meaningful share of your long runs in humid air, and pin down your fluid plan in those conditions rather than in a dry October week.

Finally, use the turnaround as a training cue. In two or three of your long runs, go out to a fixed point and come back, with a rule that the return half is run faster than the first. That builds the pacing habit the shape of this course rewards.

Jacksonville Marathon course facts

Course
Out and Back · Very Flat · Road/Pavement
Elevation gain / loss
219 ft gain, 220 ft loss
Highest / lowest point
29 ft / 5 ft
Marathon finishers
703 in 2025 (small field)
Boston qualifier
Certified Boston qualifying course
Finishers running a qualifying time
14.4% in 2025
Typical race morning
57°F at the start, 88% humidity, overcast
Race day high / low
61°F / 44°F on average

Sources

Let your current training decide the actual plan.

Current mileage, recent longest run, marathon experience, goal, and available days determine which plans rank first. After you choose and subscribe, Stride dates every workout through December 12, 2026.

Build My Plan

16-week Jacksonville Marathon plan questions, answered.

When should I start a 16-week Jacksonville Marathon plan?

The 2026 Jacksonville Marathon is scheduled for December 12, 2026, so the 16-week window opens around August 22, 2026. Treat that as the outside edge of the window, then line week one up with the plan's normal weekly rhythm.

Is a 16-week plan long enough for the Jacksonville Marathon?

Use this window when you have a running base and want several weeks before the hardest marathon-specific work begins. The extra month over a 12-week plan creates more room for gradual long-run growth and recovery. 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.

How should I prepare for the Jacksonville Marathon course in 16 weeks?

Use the first month to establish consistency, then make long runs progressively more specific to the race's terrain and conditions. The course rehearsal should grow with the plan, not appear all at once in peak week. Train for the Jacksonville Marathon the way you would train for a track race stretched out over 26 miles: even effort, even cadence, no surges. With 24 feet of vertical range there is no terrain to force a change of gear, so your long runs should be flat, continuous, and run at a pace you could hold for another 45 minutes when you finish. Practicing restraint is the workout.

What if the 16-week Jacksonville Marathon window has already started?

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.

How flat is the Jacksonville Marathon?

Extremely. The whole course sits between roughly 5 and 29 feet above sea level, and it accumulates about 219 feet of climb and 220 feet of descent over the full 26.2 miles, for a net change of one foot. There is no hill anywhere on it, only camber and drainage.

Is the Jacksonville Marathon a good Boston qualifier?

It is a solid one. The course is certified and 14.4% of finishers ran a Boston qualifying time in 2025, after 11.4% in 2024 and 9.4% in 2023. Because the course has effectively no net drop, no downhill adjustment applies to times run there, so what you run is what counts.

Put the 16-week window against your actual race.

Each page counts back from race day, maps the 4 phases to real dates, and applies the window to that course and its typical conditions.