Big Sky Marathon
Big Sky Marathon and Half Marathon offers a flat, fast course through Montana's scenic Madison Valley.
Race Date
Jul 12, 2026
Location
Ennis, MT
Quick facts
- Date
- Sunday, July 12, 2026
- Location
- Ennis, Montana
- Distance
- Half marathon (13.1 mi) + 26.2M
- Course
- Loop Course
- Terrain
- Road
- USATF certified
- Not listed
- Finishers on record
- 486
Highlights
Good For
Atmosphere
Course
The Experience
The Big Sky Marathon and Half Marathon winds through Montana's picturesque Madison Valley, offering a predominantly flat and fast course. This race, first run in 2003 and now in its 13th edition, is known for its potential for personal bests, with a typical winning time around 96 minutes for the half marathon.
Runners from approximately 11 states have participated in recent years, drawn to the stunning natural beauty of the area. While the race has a growing field, its repeat-runner loyalty is low, suggesting a fresh experience for each participant.
The event takes place in Ennis, Montana, with typical race-day temperatures ranging from the mid-50s to the mid-80s Fahrenheit, making for comfortable running conditions.
Race-provided description
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Course Info
Course Type
Loop Course
Terrain
road
Scenery
Rural
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Quality Score
Solid Pick4213 years running
~32 finishers a year
small race — neutral
0% returning runners
2 timing sources · 8 photos
runners from 11 states
winner 1:36:07
typical high 84°F
Race Day Weather
5-year historical avgStart (Low)
57°
Afternoon (High)
84°
Hot conditions — adjust pace expectations, prioritize hydration
0.0"
Precipitation
9 mph
Wind
44%
Humidity
Historical Finish Times
How 486 finishers actually crossed the line across 13 years.
Most recent
2025
Total finishers
486
Median time
2:23:11
Latest turnout
32
States
29
Turnout by year
2017–2025
Hover the histogram to inspect specific finish times.
Race Photos
Frequently asked
When is the Big Sky Marathon?
The Big Sky Marathon is held on Sunday, July 12, 2026.
Where does the Big Sky Marathon take place?
It takes place in Ennis, Montana.
What distances does the Big Sky Marathon offer?
The half marathon (13.1 miles), plus 26.2M.
Is the Big Sky Marathon course flat and good for a PR?
The Big Sky Marathon is a ultra-flat, loop course course.
How many people run the Big Sky Marathon?
HalfRuns has finish records for 486 runners who have completed the Big Sky Marathon.
HalfRuns editorial — independent, no paid placement.
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