Nagano Marathon
Nagano, Japan · Sunday 20 April 2025
Nagano Marathon, held in mid-April in Nagano, Japan, is an annual event that celebrates the city's role as host of the 1998 Winter Olympic Games. This IAAF Bronze Label Road Race takes runners on a point-to-point course, starting at the Nagano Sports Park and finishing at the Nagano Olympic Stadium. The route passes iconic Olympic venues like the Zenk?-ji temple and the Aqua Wing, offering a mix of historical significance and natural beauty.\n\nWith its relatively flat profile and stunning scene
Difficulty Calculator
h
:m
:s
Adjusted Time
3:53:43
Time difference: -6.3 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain47m
Elevation High374m
Elevation Low339m
Weather Forecast
High18°C
Low10°C
Chance of Rain75%
Nagano Marathon 2025 Course Analysis
Nagano Marathon is a full marathon held in Nagano, Japan, scheduled for Sunday 20 April 2025. The course is run on road surface with 47m of total elevation gain, reaching a maximum altitude of 374m above sea level. For registration and full race details, visit the official Nagano Marathon website.
Elevation Profile
This is a very flat course with only 47m of total elevation gain across the full distance. The course ranges from 339m to 374m above sea level — a 35m elevation range that makes it one of the flatter races available. Runners targeting a personal best will appreciate the minimal climbing.
Expected Race Day Weather
Based on historical weather data for April, the expected race day conditions are as follows. Near-ideal running temperatures are expected, ranging from 10°C to 18°C. This temperature range is widely considered optimal for marathon performance, allowing efficient heat dissipation without cold-related issues. There is a high chance of rain (75%). Runners should prepare for wet conditions, including appropriate footwear and clothing choices.
Surface Type: Road
Nagano Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.
How Difficult Is Nagano Marathon?
Our difficulty rating for Nagano Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.
Looking for an easier marathon or a tougher challenge? You can also compare Nagano Marathon against other marathons to find the right race for your goals.