2027 Kasumigaura Marathon - Apr 18 Countdown

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Race Information

Race	2027 Kasumigaura Marathon - Apr 18
City	Tsuchiura
Date	2027-04-18 at 09:45
Field Size	~14,000 runners
Time Limit	6 hours
Cutoff pace	8:32/km
Timezone	Asia/Tokyo
Official Site	Kasumigaura Marathon Organizing Committee (かすみがうらマラソン実行委員会)
Registration	Register · 12000 JPY

Race Day Weather

Average Temperature	13.5°C / 56°F
Humidity	75%
Wind	22.6 km/h
Rain Chance	42%
Typical Conditions	Mild mid-April spring weather in the Kanto plain, typically 11-19C by the late-morning start, often dry but with a breeze off Lake Kasumigaura.

What to Prepare: Dress for a warming spring morning that can turn breezy by the lake: a singlet or short sleeves for racing, a throwaway top layer for the start, and a cap for the open, shadeless lakeside stretches.

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 22.6 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	9.5°C	13.8°C	17.2°C
Dew point	3.4°C	8.7°C	13.3°C

Wet-day chance: 42% Runnability: 74/100

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

Course Profile

Course Type	Loop road marathon around a lake
Elevation Gain	40m
Terrain	Road
Profile	A famously flat course that loops around Lake Kasumigaura. The first half crosses an elevated plateau with the only real climb (a gentle rise of about 20 m starting near the 2 km mark), then the second half runs alongside the lake on flat ground.
Boston Qualifier	Yes — Check your BQ time

Prepare for 2027 Kasumigaura Marathon - Apr 18

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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Marathon Predictor — 5K, 10K & Half Marathon Race Predictor

Free marathon predictor — convert your 5K, 10K, or half marathon time into race-day estimates from R...

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Race Finish Time Calculator & Predictor — Free

Predict your race finish time from pace, or set a goal time to find required pace. Free instant calc...

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Heart Rate Zone Calculator — 5-Zone Training Guide

What heart rate should you train at? Enter your age and resting HR to get personalized 5-zone traini...

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Frequently Asked Questions

When and where is the Kasumigaura Marathon 2027?

The 37th Kasumigaura Marathon is expected on Sunday, April 18, 2027, with the full marathon starting at 9:45 AM. The race starts and finishes at Kawaguchi Sports Park (J:COM Field Tsuchiura) in Tsuchiura City, Ibaraki Prefecture, and loops around Lake Kasumigaura, Japan's second-largest lake. The exact 2027 date is confirmed each year once the organizing committee publishes the official outline, typically in the autumn before the race.

How do I enter the Kasumigaura Marathon, and is there a lottery?

There is no lottery: full-marathon entry is first-come, first-served against a 14,000-runner quota, so it can sell out before the deadline. Registration opens through the official site and platforms such as RUNNET, and the standard full-marathon fee has been around 12,000 yen (with a higher late-entry fee). Set a realistic goal first with our race time predictor.

What is the time limit and is the course beginner-friendly?

The full marathon has a 6-hour time limit, with interim cutoffs around the 17 km and 28.5 km points, so it suits steady first-timers who can hold a consistent pace rather than back-of-pack walkers. The course is one of Japan's flattest, which makes even pacing the whole game; plan your splits with our pace calculator.

Is the Kasumigaura Marathon a Boston-qualifying race?

Yes. The course is certified by the Japan Association of Athletics Federations (JAAF / 日本陸連公認), so an official chip time can support a Boston Marathon qualifying application if you meet your age-group standard. The flat profile makes it a realistic place to chase a qualifier; check where you stand with our Boston qualifying calculator.

What makes the Kasumigaura course so fast?

The route circles Lake Kasumigaura with almost no elevation change. The first half runs across a low plateau where the only notable climb is a roughly 20 m rise beginning near the 2 km mark, and the second half is flat lakeside road. With no hills to manage and cool spring air, it is a popular target for a personal best, though the open lakeside sections can be exposed to wind.

What is the International Blind Marathon held alongside it?

The Kasumigaura Marathon is co-staged with the International Blind Marathon, with B1, B2 and B3 visually-impaired divisions recognized in the para-athletics community. Guide runners accompany blind athletes, and the event is one of the longest-running races of its kind in Japan, giving the day a distinctive inclusive atmosphere.

How do I get there as an international visitor?

Tsuchiura sits in Ibaraki Prefecture, reachable from central Tokyo in roughly an hour by JR Joban Line train, so it works well as a day trip or single overnight from a Tokyo base. Many nationalities can enter Japan visa-free for short tourist stays and Japan does not currently require an ESTA or eTA; confirm your own nationality's requirement before booking.