The River Run
Decision scores
Six 0–100 scores telling you, at a glance, who this race is for.
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About the Race
The River Run will take place Saturday September 9/27/2025 10:00 am in picturesque Simsbury, Connecticut. Featuring USATF certified 5k and 10k road races as well as 1 mile & 1/2 mile kid's races. This is a very flat course (PR flat) along smooth roads that border parks, Farmington River, bucolic farms, & lovely residential homes. ENTRY FEES 5K Entry Fees: Up until 8/28 = $30; 8/29-9/20=$35; Race Day = $40 10K Entry Fees: Up until 8/28 = $35; 8/29-9/20 = $40; Race Day = $45 Kids Race: Free All...
Course Profile
Course profile data unavailable for this race.
Course features
Accessibility & inclusion
Vibe & community
History & past results
Past finisher times and year-over-year participation will appear here once the organizer publishes them.
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Common questions
How hard is the The River Run 5K?
We don't have a verified elevation profile yet — check the organizer's course map for the climb breakdown.
What should I wear?
Dress for ~10°F warmer than the standing temperature once you start running. Throwaway long-sleeve at the start, gloves and a hat for sub-50°F mornings, singlet plus visor when it climbs above 60°F. The race-day forecast above is the source of truth closer to the date.
When does it sell out?
No published deadline. Most races raise the entry fee in tiers and can sell out without warning — sign up early if you're committed.
Similar races worth a look
- More like this in this city: All 5K races in Simsbury, CT
- Same distance, same month: Best 5K races in September
- Same distance, statewide: All 5K races in Connecticut
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