20-Week GO! St. Louis Marathon Training Plan

St. Louis, MOApril 10, 2027

Start around November 21, 2026. The calendar below gives each phase a real date, then the course guidance shows where to make the build specific to GO! St. Louis Marathon.

The GO! St. Louis Marathon starts and finishes downtown at 7 a.m. and offers a 6 a.m. early start for anyone expecting to take between six and seven and a half hours. That accommodation is more generous than most road marathons make, and it's the single most useful fact about this race if you're a slower runner deciding where to run your first one.

Race day
April 10, 2027
Start window
November 21, 2026
Runway
20 weeks
Course
city streets, downtown start and finish
Plan choice
Current training

Does this window fit your starting point?

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.

  • You want a longer foundation phase before marathon-specific training.
  • Your current mileage is steady but below the load you expect to carry later.
  • You prefer gradual long-run growth with regular step-back weeks.
  • You can sustain a five-month routine without turning every week into a peak week.

The 20-week GO! St. Louis 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 1–6

Nov 22, 2026–Jan 2, 2027

Set the routine, grow easy volume gradually, and finish each week with enough control to repeat it.

Build

Weeks 7–13

Jan 3, 2027–Feb 20, 2027

Extend the long run, introduce race-specific terrain, and keep recovery weeks on the calendar.

Peak

Weeks 14–17

Feb 21, 2027–Mar 20, 2027

Complete the most demanding race rehearsals and settle fueling, pacing, shoes, and clothing before taper begins.

Taper

Weeks 18–20

Mar 21, 2027–Apr 10, 2027

Reduce the load, keep familiar running in the week, and let the work from the previous four months show up on race day.

Make the window specific to GO! St. Louis Marathon.

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.

Read the full race guide

How to train for the GO! St. Louis Marathon

Train for the GO! St. Louis Marathon as a city street race in early April, which gives you two things to prepare for even without a published course profile: a lot of turns, and a spring morning that could be almost anything. Both are trainable, and neither one requires knowing the elevation.

Turns cost more than runners expect. Every one breaks your rhythm and adds distance if you swing wide, so practice running tangents on your long runs and get used to accelerating back up to pace after a corner instead of drifting for a quarter mile.

For the weather, build variety into the last six weeks on purpose: some long runs cold, some warm, some in the rain. An early April race in this part of the country can hand you cold rain or an unseasonably warm morning, and the runners who cope best are the ones who've already run in both and know what they'll wear.

One more piece that's specific here. Check the map yourself, and if you're local, run part of the route. On a course the organizer doesn't describe, local knowledge is worth more than usual.

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 April 10, 2027.

Build My Plan

20-week GO! St. Louis Marathon plan questions, answered.

When should I start a 20-week GO! St. Louis Marathon plan?

The 2027 GO! St. Louis Marathon is scheduled for April 10, 2027, so the 20-week window opens around November 21, 2026. Treat that as the outside edge of the window, then line week one up with the plan's normal weekly rhythm.

Is a 20-week plan long enough for the GO! St. Louis Marathon?

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.

How should I prepare for the GO! St. Louis Marathon course in 20 weeks?

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 for the GO! St. Louis Marathon as a city street race in early April, which gives you two things to prepare for even without a published course profile: a lot of turns, and a spring morning that could be almost anything. Both are trainable, and neither one requires knowing the elevation.

What if the 20-week GO! St. Louis 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 long do you have to finish the GO! St. Louis Marathon?

Six and a half hours from the 7 a.m. start. The GO! St. Louis Marathon also offers a 6 a.m. early start for participants who expect to finish between six and seven and a half hours, mostly walkers. That combination gives a slower runner real room, which not every city marathon bothers to do.

Is the GO! St. Louis Marathon good for a first marathon?

Yes, on logistics. A 7 a.m. downtown start, a six and a half hour limit and a 6 a.m. early start option all make it forgiving for a first timer. The one thing to check for yourself is the course profile, because the organizer publishes no written course description and no elevation chart.

Put the 20-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.