12-Week Big Island International Marathon Training Plan

Hilo, HIMarch 14, 2027

Start around December 20, 2026. The calendar below gives each phase a real date, then the course guidance shows where to make the build specific to Big Island International Marathon.

The Big Island International Marathon runs two out-and-backs from the lawn of the Hilo Hawaiian Hotel, and the gun goes at 6 a.m. for a reason. By mid-morning the Hilo side of Hawaii is warm enough and wet enough to rewrite your race plan for you, so the organizers hand you the coolest hours available and close the course at 1 p.m.

Race day
March 14, 2027
Start window
December 20, 2026
Runway
12 weeks
Course
Rolling Hills · Point to Point
Plan choice
Current training

Does this window fit your starting point?

Use this window when your recent training is steady and the opening week will not be a mileage jump. If you are returning after a long break, twelve weeks is too little room to rebuild and peak at the same time.

  • Your weekly mileage has been consistent for the last six to eight weeks.
  • You have completed recent long runs and do not need to rebuild from three easy miles.
  • You can protect the same number of run days from week one through race week.
  • You are prepared to begin race-specific work early instead of using a long base phase.

The 12-week Big Island International 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.

Settle

Weeks 1–2

Dec 21, 2026–Jan 3, 2027

Hold close to your current volume, establish the weekly rhythm, and make sure the opening load is honest.

Build

Weeks 3–7

Jan 4, 2027–Feb 7, 2027

Grow the long run and weekly work with step-back weeks intact. There is no room to repay missed mileage.

Peak

Weeks 8–10

Feb 8, 2027–Feb 28, 2027

Complete the most race-specific long runs, rehearse fueling, and practice the terrain that will decide the final 10K.

Taper

Weeks 11–12

Mar 1, 2027–Mar 14, 2027

Reduce volume, keep the routine familiar, and arrive on race day without trying to squeeze in one more big week.

Make the window specific to Big Island International Marathon.

Course-specific work starts early in a 12-week build. Put the race's terrain and expected conditions into long runs once the opening weeks feel controlled, without adding extra hard days.

Read the full race guide

How to train for the Big Island International Marathon

Train for the Big Island International Marathon as a humidity race first and a hills race a distant second. Race-morning norms are near 70F with humidity around 80% and rain or overcast skies, so the pace that feels comfortable at home in dry cool air will feel a full effort level harder on the Hilo coast.

Spend the last four to six weeks getting your body used to working warm and wet. Run in the rain on purpose, including one long run where your shoes, socks and anti-chafe setup all get properly soaked, because that is the likely race-day condition and not a worst case. Work out your sweat rate and drink to it, since aid sits roughly every two miles with water and Gatorade and you will need most of those stops. Then pace by effort, not by watch: on the small repeated rises of Old Mamalahoa Highway, holding a number will cost you the last hour.

Big Island International Marathon course facts

Course
Point to Point · Rolling Hills · Road/Pavement
Highest / lowest point
236 ft / 1 ft
Marathon finishers
115 in 2026 (very small field)
Boston qualifier
Certified Boston qualifying course
Finishers running a qualifying time
4.4% in 2026
Typical race morning
70°F at the start, 80% humidity, rain, overcast
Race day high / low
79°F / 65°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 March 14, 2027.

Build My Plan

12-week Big Island International Marathon plan questions, answered.

When should I start a 12-week Big Island International Marathon plan?

The 2027 Big Island International Marathon is scheduled for March 14, 2027, so the 12-week window opens around December 20, 2026. Treat that as the outside edge of the window, then line week one up with the plan's normal weekly rhythm.

Is a 12-week plan long enough for the Big Island International Marathon?

Use this window when your recent training is steady and the opening week will not be a mileage jump. If you are returning after a long break, twelve weeks is too little room to rebuild and peak at the same time. 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 Big Island International Marathon course in 12 weeks?

Course-specific work starts early in a 12-week build. Put the race's terrain and expected conditions into long runs once the opening weeks feel controlled, without adding extra hard days. Train for the Big Island International Marathon as a humidity race first and a hills race a distant second. Race-morning norms are near 70F with humidity around 80% and rain or overcast skies, so the pace that feels comfortable at home in dry cool air will feel a full effort level harder on the Hilo coast.

What if the 12-week Big Island International 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.

Is the Big Island International Marathon a hard course?

It is hard for climate reasons rather than terrain reasons. Elevation stays between about 1 and 236 feet, so the rollers along the coast are gentle and there is no signature climb. What takes the time is roughly 70F and 80% humidity at the 6 a.m. start, warming toward a high near 79F while you are still out there.

What time does the Big Island International Marathon start and how long do I get?

The race starts at 6 a.m. from the Hilo Hawaiian Hotel and the course closes at 1 p.m., which gives you seven hours. Aid stations with water and Gatorade sit roughly every two miles. The early gun is deliberate, since it buys you the coolest and least brutal hours the Hilo coast has on offer.

Put the 12-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.