⏵ Course guide · Kauai coastal road race
The Kauai Marathon and Half Marathon share 11 coastal miles out of Poipu before the full marathon climbs to Kalaheo and the half finishes through the Kukui'ula Resort. I will walk you through the course and its strict sweep checkpoints first, then give you a pacing and fueling plan built for a warm tropical morning, plus free calculators to dial in your own numbers.
These facts come from the official race FAQ and course pages. Check the current year details, cutoffs, and aid stations before you commit. Race logistics change year to year.
Both races start near Poipu Shopping Village at the sunny southern end of Kauai and follow the same route for their first 11 miles before the courses diverge.
The shared opening miles follow the contour of the southern coastline, passing picturesque beaches, rugged volcanic peaks, and tropical rain forest as dawn breaks. Runners pass through the shaded, century-old Tunnel of Trees before winding through misty Omao, one of the more memorable stretches on the course before the routes split.
Past Omao, half marathoners enter the Kukui’ula Resort for spectacular ocean views over the closing miles back to the oceanfront finish in Poipu, a scenic way to close out 13.1 miles.
Full marathoners continue past the split out to Lawai before climbing to reveal stunning ocean views at the top of Kalaheo. From there, the remaining miles are a gradual descent back to the oceanfront finish, where a rousing island welcome awaits every runner who makes the cutoff.
The 7-hour overall cutoff sounds generous for a marathon, about 16 minutes per mile average, but the two intermediate sweep checkpoints are the real test, since missing either one reroutes you to the half marathon finish regardless of your overall pace.
You must clear the tree tunnel at mile 6.7 by 7:55 AM, a 16 minute per mile pace from the 6 AM gun, and mile 11 by 8:50 AM, a 15:27 per mile pace. Both are tighter than the overall 7-hour average implies, so a slow first hour eats directly into your buffer at the point where you have the least room to make it back. A race-time estimate built from your real training tells you honestly whether your marathon pace clears those checkpoints with margin to spare.
The climb to Kalaheo lands well past the sweep checkpoints, deep enough into the race that even a strong early pace can turn into a struggle if you spent too much there. Treat the shared coastal opening as controlled effort, not a fast start, so you have legs left when the course turns uphill toward Kalaheo.
⏵ Free tools to pace this course
A 6 AM start beats the worst of the heat, but Kauai in early September stays warm and humid, and the full marathon runs long enough to finish well into the warmer part of the day.
With 22 aid stations on the full marathon and 9 on the half, both including start and finish, you have frequent access to flavored Powerade and fluids throughout. Aim for roughly 30 to 60 grams of carbohydrate per hour for a road marathon effort, and use the frequent stops to stay ahead of your needs rather than catching up after you fall behind.
Sodium in the 300 to 700 mg per liter range covers most runners, and the humid, warming conditions on Kauai push toward the higher end of that range as the morning goes on, especially for runners still out on the full marathon course past the sweep checkpoints.
⏵ Build your fueling plan
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⏵ Train for it with Summit Line
Get a race-day plan built around YOUR fitness, this course's checkpoint pace requirements, and the Kalaheo climb. Summit Line reads your real training, builds a plan around the cutoffs that actually matter on this course, and rehearses your fueling so race day is something you execute, not guess at.
It is a coastal road marathon that opens with 11 shared miles along the scenic southern coastline before the full marathon heads out to Lawai and climbs to Kalaheo for ocean views, then descends gradually back to the finish in Poipu. The real difficulty is less about the terrain and more about the strict 7-hour cutoff paired with two hard intermediate sweep checkpoints, so even walker-friendly finishers need to respect the required pace early or risk getting pulled to the half marathon course.
There is a strict 7-hour overall cutoff for the full marathon. Along the way, all full and half marathon participants must pass the tree tunnel at mile 6.7 by 7:55 AM, which works out to a 16 minute per mile pace. Full marathon participants must also reach mile 11 by 8:50 AM, a 15 minute 27 second per mile pace. Miss that second checkpoint and you are rerouted onto the half marathon course to the finish, which means a finisher medal but a DNF, not a marathon finish time.
Flavored Powerade is provided at the start, finish, and every aid station, and the full marathon has 22 aid stations total while the half has 9, so access is not the issue. Aim for roughly 30 to 60 grams of carbohydrate per hour on a road marathon effort, and plan your sodium for a warm, humid tropical morning, since Kauai in early September can run hot even with a 6 AM start. Build your numbers with the free ultra fueling calculator before race day.
Both races start near Poipu Shopping Village and share the first 11 miles along the coastline, passing beaches, volcanic peaks, and tropical rain forest views before reaching the shaded Tunnel of Trees and misty Omao. From there, half marathoners head into the Kukui’ula Resort for ocean views the rest of the way, while full marathoners continue out to Lawai and climb toward Kalaheo before a gradual descent back to the oceanfront finish in Poipu.
Both courses are described as walker friendly by the race itself, but that comes with a real asterisk: the strict 7-hour marathon cutoff and its two intermediate sweep checkpoints still apply. A walker aiming for the full marathon needs to hold roughly 16 minute per mile pace through mile 6.7 and 15:27 pace through mile 11 to stay on course, so "walker friendly" here means the format accommodates walking, not that the clock waits for you.
The expo runs Friday, September 4 from 10 AM to 6 PM and Saturday, September 5 from 9 AM to 4 PM at the Grand Hyatt Kauai Resort and Spa, where you will need a state-issued photo ID or passport to pick up your bib. There is no race-morning packet pickup, so plan to arrive with enough buffer to make the expo, and note that shuttle buses run from the Grand Hyatt to the start line beginning at 4 AM on race morning.
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<a href="https://runsummitline.com/guides/the-kauai-marathon">The The Kauai Marathon course guide</a><iframe src="https://runsummitline.com/embed/race/the-kauai-marathon" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="The Kauai Marathon course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details, dates, cutoffs, and aid stations come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The fueling and pacing advice is general and not medical advice.
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