Sun, Sep 13, 2026
Weston, MA
Entry is $25 now and rises to $30 after Aug 30, 2026, so registering before then saves $5.
The race raises money for research into rare neuroimmune disorders, organized by a patient-led foundation that grew out of one woman's NMO diagnosis. The course is a standard road distance through Weston, and the morning draws people who have a personal connection to the cause alongside those who simply want to help fund the work.
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Going by the 2025 results, this is a small, friendly field, and the spread of finish times is wide, so this is a mostly recreational race rather than one for club runners.
3.1 Miles · 2025 results
Top 3: Timothy Gavin (17:52) · M. Callow (35:38) · T. Callow (35:39)
The TSF 5K for Rare Neuroimmune Disorders has been held every year since at least 2025. That is as far back as RunSignup's records for this race go, so it may well be older.
Enter a finish time to see where it lands against the most recent 3.1 Miles results.
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Jul 27, 2026.
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Almost certainly not. Half the 3.1 Miles field finished slower than 50:38, and the last recorded finisher came in around 1:07:52, so there is a long tail of runners behind the middle of the pack. Most fields are far slower than people expect.
It is a small race (120 finishers), which is friendlier and less intimidating than a big-city event, though the field thins out. There is no qualifying time, and the finish-time spread above shows how varied the field really is. If it is your first 3.1 Miles, that spread matters more than the winner's time.
The 3.1 Miles winner ran 17:52 while the median finisher took 50:38. That spread points to a broad, mostly recreational field rather than a race dominated by club runners.