20-Week Big Island International Marathon Training Plan

Hilo, HIMarch 14, 2027

Start around October 25, 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
October 25, 2026
Runway
20 weeks
Course
Rolling Hills · Point to Point
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 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.

Foundation

Weeks 1–6

Oct 26, 2026–Dec 6, 2026

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

Build

Weeks 7–13

Dec 7, 2026–Jan 24, 2027

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

Peak

Weeks 14–17

Jan 25, 2027–Feb 21, 2027

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

Taper

Weeks 18–20

Feb 22, 2027–Mar 14, 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 Big Island International 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 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

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

When should I start a 20-week Big Island International Marathon plan?

The 2027 Big Island International Marathon is scheduled for March 14, 2027, so the 20-week window opens around October 25, 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 Big Island International 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 Big Island International 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 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 20-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 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.