2026 Kauai Marathon - Sep 6 Countdown

Q: How do you register for the Kauai Marathon?

Registration is open and first-come with tiered pricing &mdash; there is no lottery. The marathon opens around $220 and rises in stages (roughly $240, $265, $285, then $295 in the final weeks) as the September date approaches. Sign up early through the official site to lock the lowest price.

Q: Is the Kauai Marathon a Boston qualifier?

No. The Kauai Marathon is not a Boston qualifier &mdash; the hilly, humid course produces very few BQ times (around 0.9% of finishers). If a Boston qualifying time is your goal, Hawaii alternatives such as Honolulu or the Maui Oceanfront Marathon are flatter; come to Kauai for the scenery, not the PR.

Q: What is the time limit for the Kauai Marathon?

The marathon has a 7-hour time limit, which is generous for such a hilly course. With the 6:00 AM start, that gives walkers and slower runners a realistic cutoff, but the midday heat and humidity make the back half harder, so pace the early climbs conservatively.

Q: What is the weather like on race day?

Expect a warm, humid tropical morning near 80&deg;F (27&deg;C) with humidity around 73%. Poipu sits on Kauai's sunny, dry south shore, so heavy rain is unlikely, but brief trade-wind showers are common. Dress light, use sunscreen, and carry electrolytes for the climbs.

Q: Where does the Kauai Marathon start and finish?

Both start and finish are in Poipu, the resort area near Koloa on Kauai's south shore. The loop heads inland through Lawai and Kalaheo for ocean and rainforest views before returning to the oceanfront finish, so a stay in the Poipu/Koloa area keeps you close to the start line.

Q: How do you get to the Kauai Marathon?

Fly into Lihue Airport (LIH), about a 30-minute drive from Poipu. Most U.S. mainland visitors connect through Honolulu (HNL) on a short inter-island hop, though some direct flights from the West Coast exist. A rental car is strongly recommended &mdash; Kauai has limited public transit and the start area is spread across the south shore.

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Race Information

Race	2026 Kauai Marathon - Sep 6
City	Koloa
Date	2026-09-06 at 06:00
Field Size	~320 runners
Time Limit	7 hours
Cutoff pace	9:57/km
Timezone	Pacific/Honolulu
Official Site	The Kauai Marathon
Registration	Register · 220 USD

Race Day Weather

Average Temperature	26.3°C / 79°F
Humidity	75%
Wind	25.6 km/h
Rain Chance	38%
Typical Conditions	Warm, humid tropical morning with frequent light trade-wind showers

What to Prepare: The 6:00 AM start near Poipu is already warm (~80°F / 27°C) and humid (~73%); the south shore is Kauai's driest, but brief showers are common. The early gun goes off around sunrise, so carry electrolytes and treat the climbs by effort, not pace.

Based on historical averages for race week. Use our Weather Score Calculator and What to Wear Guide for personalized advice.

Wind Impact on Race Day

Wind at 25.6 km/h can affect your marathon pace by 5-15 seconds per kilometer. Headwinds slow you down exponentially — a 20 km/h wind costs more than twice a 10 km/h wind.

Calculate your wind-adjusted pace →

Race-Week Climate

Based on 20 years of race-week weather (2005-2024), MERRA-2 reanalysis

	Cooler	Typical	Warmer
Temperature	25.4°C	26.4°C	27.2°C
Dew point	20.4°C	21.5°C	22.9°C

Wet-day chance: 38% Runnability: 50/100

Data: NASA POWER (MERRA-2 reanalysis), NASA Langley Research Center

Course Profile

Course Type	Loop
Elevation Gain	620m
Terrain	Road (rolling coastal highway and rural roads)
Profile	One of the hardest road marathons in the U.S. The full course is a hilly loop starting and finishing in Poipu, sharing the first 11 miles with the half before climbing out to Lawai and up to Kalaheo, then descending back to the oceanfront finish. About +620 m of total climbing on a scenic coastal route. Not a Boston qualifier (only ~0.9% of finishers run a BQ time).

Prepare for 2026 Kauai Marathon - Sep 6

Use our free training tools to get race-ready:

Running Pace Calculator — Min/km, Finish Time & Pace Chart

Free running pace calculator for 5K, 10K, half marathon, and marathon. Get min/km or min/mile, your ...

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Free Pace Band Generator — Printable Race Day Wristband

Free printable pace band for marathon, half marathon, or custom distance. Choose even, negative, or ...

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Marathon Wake-Up Time Calculator — Race Morning Timeline

7 AM race, wake at 3:45 AM? Enter the gun time; we work backward through meal, gear, bathroom, warm-...

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Heat Adjustment Pace Calculator

How much does heat slow your running? Calculate your adjusted pace, finish time loss, and heat risk ...

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Sweat Rate & Hydration Calculator for Runners

Measure your real sweat rate, then get a personalized pre, during and post-run fluid and electrolyte...

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Wind Effect on Running — How Much Does Wind Slow You?

How much does a headwind actually slow you down? This free calculator turns wind speed and direction...

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View all running tools

Frequently Asked Questions

How do you register for the Kauai Marathon?

Registration is open and first-come with tiered pricing — there is no lottery. The marathon opens around $220 and rises in stages (roughly $240, $265, $285, then $295 in the final weeks) as the September date approaches. Sign up early through the official site to lock the lowest price.

How hard is the Kauai Marathon course?

It is one of the toughest road marathons in the country. The full course is a hilly loop with about +620 m (2,036 ft) of climbing, including a long grind from Lawai up to Kalaheo, before a gradual descent to the oceanfront finish in Poipu. Average finishing times run roughly 5 hours, so plan to run by effort on the climbs rather than chasing a flat-course pace.

Is the Kauai Marathon a Boston qualifier?

No. The Kauai Marathon is not a Boston qualifier — the hilly, humid course produces very few BQ times (around 0.9% of finishers). If a Boston qualifying time is your goal, Hawaii alternatives such as Honolulu or the Maui Oceanfront Marathon are flatter; come to Kauai for the scenery, not the PR.

What is the time limit for the Kauai Marathon?

The marathon has a 7-hour time limit, which is generous for such a hilly course. With the 6:00 AM start, that gives walkers and slower runners a realistic cutoff, but the midday heat and humidity make the back half harder, so pace the early climbs conservatively.

What is the weather like on race day?

Expect a warm, humid tropical morning near 80°F (27°C) with humidity around 73%. Poipu sits on Kauai's sunny, dry south shore, so heavy rain is unlikely, but brief trade-wind showers are common. Dress light, use sunscreen, and carry electrolytes for the climbs.

Where does the Kauai Marathon start and finish?

Both start and finish are in Poipu, the resort area near Koloa on Kauai's south shore. The loop heads inland through Lawai and Kalaheo for ocean and rainforest views before returning to the oceanfront finish, so a stay in the Poipu/Koloa area keeps you close to the start line.

How do you get to the Kauai Marathon?

Fly into Lihue Airport (LIH), about a 30-minute drive from Poipu. Most U.S. mainland visitors connect through Honolulu (HNL) on a short inter-island hop, though some direct flights from the West Coast exist. A rental car is strongly recommended — Kauai has limited public transit and the start area is spread across the south shore.