South Texas International Marathon
McAllen, United States of America · Monday 7 December 2026
The marathon features a point-to-point course spanning 26.2 miles, beginning at Donna City Square Park in Donna, Texas and concluding at the Mercedes FEMA Dome in Mercedes, Texas. Runners traverse Expressway Business 83, passing through the historic downtown districts of Weslaco, Mercedes, and La Feria, covering four cities and two counties along the route. The terrain is characterized as very flat, making the course potentially fast and suitable for Boston Marathon qualification.
Difficulty Calculator
h
:m
:s
Adjusted Time
4:08:40
Time difference: +8.7 minutes compared to a flat, road, temperate course.
Course Details
Elevation Gain52m
Elevation High30m
Elevation Low11m
Weather Forecast
High32°C
Low17°C
Chance of Rain2%
How hard is South Texas International Marathon?
Difficultharder than 65% of marathons
Flattest / easiestHardest
On our difficulty model, South Texas International Marathon plays about 11 minutes slower than an average road marathon for a 3:30 runner. It ranks #404 hardest of 1151 marathons we analyse, and #215 of 576 in United States of America. Use the calculator above to see the exact adjusted time for your own goal pace.
What will you run at South Texas International Marathon?
Estimated finish times on this course versus the same effort on an average road marathon, based on its elevation, surface, and expected race-day temperature.
| Average-course time | On South Texas International Marathon | Difference |
|---|---|---|
| 3:00:00 | 3:04:19 | +04:19 |
| 3:30:00 | 3:36:26 | +06:26 |
| 4:00:00 | 4:08:40 | +08:40 |
| 4:30:00 | 4:41:01 | +11:01 |
| 5:00:00 | 5:13:30 | +13:30 |
| 5:30:00 | 5:46:04 | +16:04 |
| 6:00:00 | 6:18:45 | +18:45 |
Use the calculator above for your exact goal time. Want a prediction from your own training? Try the marathon time predictor.
South Texas International Marathon 2026 Course Analysis
South Texas International Marathon is a full marathon held in McAllen, United States of America. It is scheduled for Monday 7 December 2026. The course is run on road surface with 52m of total climbing, with its high point near 30m above sea level. For registration and full race details, visit the official South Texas International Marathon website.
Elevation Profile
This is a very flat course, with only 52m of total climbing and little change in altitude throughout. Flat profiles let you hold an even pace from start to finish, which makes this a fast, PB-friendly race.
Expected Race Day Weather
Based on historical weather data for December, the expected race day conditions are as follows. Hot conditions are expected, with temperatures between 17°C and 32°C. Heat is one of the biggest performance factors in distance running - for every degree above 15°C, finish times can slow by roughly 1-2%. Extra hydration and a conservative start are strongly recommended. There is a low chance of rain (2%), so dry conditions are likely.
Surface Type: Road
South Texas International Marathon is run on road surfaces, which provide the fastest and most predictable conditions for racing. Road courses allow for consistent pacing and are typically the best choice for a personal best.
Looking for an easier marathon or a tougher challenge? You can also compare South Texas International Marathon against other marathons to find the right race for your goals.
Marathons of similar difficulty
If South Texas International Marathon fits your goal, these courses play out about the same on our difficulty model.
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