Set on 26 October 2025, the Saiko Ecomarathon welcomes runners to a flat, scenic loop course around the Saiko lake/pond area with starts at 11:00 AM from Doman Green Park in Toda, Saitama. The event offers a chip-friendly, family-oriented program—half marathon, 10K and 5K—plus a parent-child fun run for youngsters (the parent-child race is not chip-timed). Organizers emphasize low-impact, eco-minded race practices and a relaxed community atmosphere, making the event suitable for first-time half marathoners, club runners, and families alike. Practical race services (packet pickup, aid stations, and on-site support) and clear course routing let participants focus on enjoying the lakeside scenery and regional hospitality.
Races
The Saiko Ecomarathon 10K, also run by Japan Ecomarathon / Running in Tokyo, will be held on Sunday, 26 October 2025, at Saiko Doman Green Park, Toda (Saitama) — a fast, scenic 10 km on park and bike-path surfaces with full event support.
The Saiko Ecomarathon Half Marathon, organised by Japan Ecomarathon / Running in Tokyo, is scheduled for Sunday, 26 October 2025, at Saiko Doman Green Park (Toda City, Saitama Prefecture) and follows a chip-timed loop course suitable for both fitness runners and PR seekers.
Weather based on historical averages.
FAQs
What is the Saiko Ecomarathon October 10k?
How long is the Saiko Ecomarathon October 10k?
Where does the Saiko Ecomarathon October 10k take place?
What is the elevation gain of the Saiko Ecomarathon October 10k?
How can I prepare for the Saiko Ecomarathon October 10k?
How do I choose the right training plan for the Saiko Ecomarathon October 10k?
The Saiko Ecomarathon 10K, also run by Japan Ecomarathon / Running in Tokyo, will be held on Sunday, 26 October 2025, at Saiko Doman Green Park, Toda (Saitama) — a fast, scenic 10 km on park and bike-path surfaces with full event support.
The Saiko Ecomarathon October 10k is 10km long.
The Saiko Ecomarathon October 10k takes place in Saitama, Japan.
Runna classifies the Saiko Ecomarathon October 10k elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Saiko Ecomarathon October 10k?
The Saiko Ecomarathon 10K, also run by Japan Ecomarathon / Running in Tokyo, will be held on Sunday, 26 October 2025, at Saiko Doman Green Park, Toda (Saitama) — a fast, scenic 10 km on park and bike-path surfaces with full event support.
How long is the Saiko Ecomarathon October 10k?
The Saiko Ecomarathon October 10k is 10km long.
Where does the Saiko Ecomarathon October 10k take place?
The Saiko Ecomarathon October 10k takes place in Saitama, Japan.
What is the elevation gain of the Saiko Ecomarathon October 10k?
Runna classifies the Saiko Ecomarathon October 10k elevation profile as Flat.
How can I prepare for the Saiko Ecomarathon October 10k?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Saiko Ecomarathon October 10k?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Saiko Ecomarathon October Half Marathon?
How long is the Saiko Ecomarathon October Half Marathon?
Where does the Saiko Ecomarathon October Half Marathon take place?
What is the elevation gain of the Saiko Ecomarathon October Half Marathon?
How can I prepare for the Saiko Ecomarathon October Half Marathon?
How do I choose the right training plan for the Saiko Ecomarathon October Half Marathon?
The Saiko Ecomarathon Half Marathon, organised by Japan Ecomarathon / Running in Tokyo, is scheduled for Sunday, 26 October 2025, at Saiko Doman Green Park (Toda City, Saitama Prefecture) and follows a chip-timed loop course suitable for both fitness runners and PR seekers.
The Saiko Ecomarathon October Half Marathon is 21km long.
The Saiko Ecomarathon October Half Marathon takes place in Saitama, Japan.
Runna classifies the Saiko Ecomarathon October Half Marathon elevation profile as Flat.
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
What is the Saiko Ecomarathon October Half Marathon?
The Saiko Ecomarathon Half Marathon, organised by Japan Ecomarathon / Running in Tokyo, is scheduled for Sunday, 26 October 2025, at Saiko Doman Green Park (Toda City, Saitama Prefecture) and follows a chip-timed loop course suitable for both fitness runners and PR seekers.
How long is the Saiko Ecomarathon October Half Marathon?
The Saiko Ecomarathon October Half Marathon is 21km long.
Where does the Saiko Ecomarathon October Half Marathon take place?
The Saiko Ecomarathon October Half Marathon takes place in Saitama, Japan.
What is the elevation gain of the Saiko Ecomarathon October Half Marathon?
Runna classifies the Saiko Ecomarathon October Half Marathon elevation profile as Flat.
How can I prepare for the Saiko Ecomarathon October Half Marathon?
The best way to train for the next race is to use a personalized training plan that takes into account your current running ability, schedule, and preferences.
This will help you steadily improve your running performance and get ready for the race without risking an injury.
Check out our training plans to find the best running program for your goals!
How do I choose the right training plan for the Saiko Ecomarathon October Half Marathon?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalized training plans for every runner and every goal: Whether this is your first, 10th or 100th race, we'll help you get the most out of your training and smash your goals.
Check out our training plans to find the best running program for your goals!
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Saiko Ecomarathon October 2025 or Japan Ecomarathon. All event details are based on publicly available information and are provided solely to help users discover running events. Runna does not use any official logos, images, or proprietary content from this event or its organiser. Any trademarks or names mentioned are used descriptively to identify the event in a factual manner. For the most accurate and up to date information (including to register or purchase an entry to the event), please visit the Saiko Ecomarathon October 2025 website.
