Montana · Marathon · 10K · 5K
Big Sky Marathon
Big Sky Marathon is a marathon, 10K and 5K event held in Ennis, Montana. Its next confirmed date is Sunday, July 11, 2027. About 60 runners take part across all distances.
- Race day
- July 11, 2027
- Location
- Ennis, MT
- Field size
- ~60 runners
Race details
- Date
- Sunday, July 11, 2027
- Location
- Ennis, Montana
- Distances
- Marathon, 10K, 5K
- Field size
- About 60 runners
- Course
- Point-to-point net-downhill course dropping roughly 3,600 ft from ~8,500 ft on the Gravelly Range to ~5,150 ft at Varney Bridge; marketed as one of the longest downhill road marathons.
- Registration
- runsignup.com
- Official website
- yellowstoneadventureseries.com
Registration, course & weather
- Registration status
- Open
- Start time
- 7:00 AM MDT
- Course profile
- Point-to-point course; Mostly road, some trail; 682 ft gain, 4050 ft loss (estimated from third-party elevation data); Not a Boston qualifier
About the Big Sky Marathon
The Big Sky Marathon is the result of our success with the Madison Marathon. We held our Inaugural race in 2015 to appease marathoners from around the world who were screaming for a double (both full and half) in Montana. To non-marathoners, this is completely counter-intuitive. Afterall, why would you host a second marathon immediately after one of the most difficult marathons in America? To the likes of Marathon Maniacs and other running groups, it makes perfect sense. Why run just one marath…
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Guides from the RaceRove blog
- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Big Sky Marathon: common questions
- When is the Big Sky Marathon?
- The next confirmed date is Sunday, July 11, 2027.
- Where is the Big Sky Marathon held?
- In Ennis, Montana.
- What distances does the Big Sky Marathon offer?
- Marathon, 10K and 5K.
- How many people run the Big Sky Marathon?
- About 60 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Big Sky Marathon?
- Registration is handled by the organiser at runsignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Big Sky Marathon?
- Yes — registration is open. Listed fee for the longest distance, $80 (from runsignup.com, checked September 25, 2026).
- What time does the Big Sky Marathon start?
- 7:00 AM MDT.
- What is the course like at the Big Sky Marathon?
- Point-to-point course; Mostly road, some trail; 682 ft gain, 4050 ft loss (estimated from third-party elevation data); Not a Boston qualifier.
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.