Ultrapalooza 2025 returns on September 27–28, bringing runners to the scenic Flint Hills Trail rail‑trail in Osawatomie, Kansas, for one of the Midwest’s flattest and fastest ultrarunning events. The weekend lineup includes distances from 5 km through 100 miles, with out‑and‑back courses across crushed‑gravel trail winding through tallgrass prairies, river banks, and riparian woodlands — all part of the historic Santa Fe National Historic Trail. Aid stations are placed every 4–5 miles, each stocked with water, electrolyte drink, snacks, and gels; the start/finish zone buzzes with festivity, featuring live music, food trucks, a swag bag, and unique awards. With cutoff times ranging up to 30 hours for 100‑mile and 100 km races (12 hours for marathon/50 km, and 6 hours for the half marathon), strong volunteer support, and a welcoming atmosphere, this Kansas Super Slam Series event delivers a top-tier ultra experience.
Races
100 miles
100 km
50 miles
50 km
Marathon
Half Marathon
10 km
5 km
Race Date:
27 September, 2025
The 100‑Mile Ultra begins at 6:00 AM on Saturday, 27 September 2025, and follows a flat, fast crushed-gravel out‑and‑back course along the scenic Flint Hills Trail, with a generous 30‑hour cutoff, manned aid stations, and live music at the start/finish in Osawatomie, KS. Organized by Midwest Endurance Race Co., this event embraces prairie landscapes and community-energy at the hub trailhead.
Weather based on historical averages.
FAQs
What is the Ultrapalooza 100 Miler?
How long is the Ultrapalooza 100 Miler?
Where does the Ultrapalooza 100 Miler take place?
What is the elevation gain of the Ultrapalooza 100 Miler?
How can I prepare for the Ultrapalooza 100 Miler?
How do I choose the right training plan for the Ultrapalooza 100 Miler?
The 100‑Mile Ultra begins at 6:00 AM on Saturday, 27 September 2025, and follows a flat, fast crushed-gravel out‑and‑back course along the scenic Flint Hills Trail, with a generous 30‑hour cutoff, manned aid stations, and live music at the start/finish in Osawatomie, KS. Organized by Midwest Endurance Race Co., this event embraces prairie landscapes and community-energy at the hub trailhead.
The Ultrapalooza 100 Miler is 161km long.
The Ultrapalooza 100 Miler takes place in Osawatomie, KS, USA.
Runna classifies the Ultrapalooza 100 Miler elevation profile as Flat.
The best way to train for the next race is to use a personalised 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 personalised 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 Ultrapalooza 100 Miler?
The 100‑Mile Ultra begins at 6:00 AM on Saturday, 27 September 2025, and follows a flat, fast crushed-gravel out‑and‑back course along the scenic Flint Hills Trail, with a generous 30‑hour cutoff, manned aid stations, and live music at the start/finish in Osawatomie, KS. Organized by Midwest Endurance Race Co., this event embraces prairie landscapes and community-energy at the hub trailhead.
How long is the Ultrapalooza 100 Miler?
The Ultrapalooza 100 Miler is 161km long.
Where does the Ultrapalooza 100 Miler take place?
The Ultrapalooza 100 Miler takes place in Osawatomie, KS, USA.
What is the elevation gain of the Ultrapalooza 100 Miler?
Runna classifies the Ultrapalooza 100 Miler elevation profile as Flat.
How can I prepare for the Ultrapalooza 100 Miler?
The best way to train for the next race is to use a personalised 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 Ultrapalooza 100 Miler?
Which plan you choose will depend on your experience, schedule, objectives, and the date of the race.
Runna offers personalised 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!
More
Sport:
Running
Tags:
Nature
This event listing is for informational purposes only. Runna is not affiliated with, endorsed by, or sponsored by Ultrapalooza 2025 or Midwest Endurance Race Co. 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 Ultrapalooza 2025 website.
