2026 Kiawah Island Marathon - Dec 12

2026 Kiawah Island Marathon - Dec 12 Countdown

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Race Information

Race2026 Kiawah Island Marathon - Dec 12
CityKiawah Island
Date2026-12-12 at 08:00
Field Size~1,505 runners
Time Limit6 hours 30 min
Cutoff pace9:15/km
TimezoneAmerica/New_York
Official SiteKiawah Island Golf Resort

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Race Day Weather

Average Temperature14.7°C / 58°F
Humidity82%
Wind27.5 km/h
Rain Chance30%
Typical ConditionsMild, often-humid Lowcountry December morning — around 54 degrees F (12 degrees C) at the 8:00 a.m. start under coastal South Carolina skies, with sea-breeze gusts off the Atlantic

What to Prepare: A mid-December morning on Kiawah Island usually starts in the low 50s F (around 12 degrees C) and stays mild by winter-marathon standards, but coastal humidity and a stiff Atlantic sea breeze can make exposed stretches feel cooler. A throwaway long-sleeve at the start and gloves are smart; the flat, sheltered maritime-forest sections are calm, but plan for headwind on any open ocean-view portions.

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 27.5 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 9.8°C 14.9°C 19.2°C
Dew point 4.7°C 11.5°C 17.4°C
Wet-day chance: 30% Runnability: 69/100

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

Course Profile

Course TypeFlat coastal loop
Elevation Gain39m
TerrainRoad (paved resort roads and shaded paths, very flat)
ProfileOne of the flattest certified marathons in the country and a long-standing favorite for runners chasing a Boston qualifier or a personal best. The course is run almost entirely within the gated Kiawah Island resort community, winding past maritime forests, tidal lagoons, marshes and grand low-country homes on a mix of quiet paved resort roads and shaded paths. Total elevation gain is only about 39 m (129 ft) across the full distance — there are no real hills, just gentle bridge crossings — and the high and low points of the course differ by roughly ten feet. The full marathon and half marathon share the island, so the route is well-marshaled and lightly trafficked. It is USATF-certified (course #SC21005JK) and a Boston-qualifying race, with results submitted to the Boston Athletic Association after the event. The main variable is not terrain but weather: still, cool mornings produce fast times, while a humid front or strong sea breeze off the Atlantic is the only thing standing between you and an even split. Plan it as a true PR or BQ attempt rather than a sightseeing tour.
Boston QualifierYes — Check your BQ time

Prepare for 2026 Kiawah Island Marathon - Dec 12

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Frequently Asked Questions

When is the 2026 Kiawah Island Marathon and what time does it start?

The Kiawah Island Marathon is held on Saturday, December 12, 2026 — the 48th running of the event. The full marathon starts at 8:00 a.m. Eastern Time from the West Beach Conference Center area on Kiawah Island, South Carolina. Off-island runners typically arrive early for the resort shuttle, so build in time to park and reach the start.

Is the Kiawah Island Marathon course flat?

Yes — it is one of the flattest certified marathons in the United States. Total elevation gain is only about 129 ft (39 m) over the full 26.2 miles, with no real hills and barely ten feet between the high and low points of the course. That profile, plus quiet resort roads and shaded maritime-forest paths, is exactly why it has a reputation as a fast PR and BQ course.

Is the Kiawah Island Marathon a Boston qualifier?

Yes. The full marathon is USATF-certified (course #SC21005JK) and a recognized Boston-qualifying race; official results are submitted to the Boston Athletic Association after the event. The flat course makes it one of the more popular winter BQ attempts in the Southeast. Check your target with the Boston qualifying calculator.

What is the time limit for the Kiawah Island Marathon?

The course has a 6.5-hour time limit for both the full and half marathon, with the course closing in the early afternoon. From the 8:00 a.m. start that means finishing by roughly 2:30 p.m., or about a 14:52 per mile (9:14 per km) pace. Use the pace calculator to confirm the splits you need to stay inside the cutoff.

How do I register for the Kiawah Island Marathon and how big is it?

Registration is handled online through RunSignup via the Kiawah Island Golf Resort race page; entry is first-come, first-served with no lottery, and prices rise as race day approaches. The full marathon is a small, destination-style field — about 1,505 full-marathon finishers in 2025 — so it stays uncrowded compared with big-city races while still offering full course support, a finisher medal and a finish-line party.

What should I expect from the weather and terrain on race day?

Mid-December on Kiawah Island is mild for a winter marathon — typically in the low 50s F (around 12 degrees C) at the start — but coastal humidity and an Atlantic sea breeze are the main race-day variables. The terrain is paved resort roads and shaded paths through maritime forest, lagoons and marshland; the sheltered forest sections are calm, while any open, ocean-view stretches can carry a headwind. Cool, still mornings here produce fast times.

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