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Boulderthon Races Impact Boulder County and City of Boulder Traffic
9 months agoUS
The Boulderthon Marathon, Half Marathon, 10K, and 5K races on Sunday, September 28, 2025, will cause road closures and traffic delays in Boulder County and the City of Boulder. Travelers should expect delays and follow recommended detours. 
Key Insights
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Several road closures will be in effect in both Boulder County and the City of Boulder between 7 a.m. and 4 p.m.
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Key closures include sections of SH-119/Diagonal Highway, Jay Rd, N 51st St, N 55th St, Monarch Rd, N 71st St, Niwot Rd, Pearl St./Pearl Pkwy., Spruce St., 47th St., 26th St., and Folsom St.
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Access to some residential areas will be maintained via pilot cars.
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The Fourmile Canyon Creek will remain open with heavy runner traffic, and Boulder Reservoir will be closed until 1 p.m.
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Contact Boulderthon’s Community Coordinator at 970-610-0556 or [email protected] for questions or concerns.
Why this matters: The Boulderthon is a significant event that impacts local traffic and accessibility. Understanding the closures and alternative routes is crucial for residents and visitors to navigate the area efficiently and safely.
In-Depth Analysis
The Boulderthon races necessitate several road closures to ensure the safety of participants. These closures will affect major routes and local roads alike. Residents and travelers should plan their routes in advance, considering the specified times for each closure. The comprehensive list of closures includes:
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SH-119/Diagonal Highway:: Eastbound closure at 47th St. until 10 a.m. Northbound access via Valmont Rd.
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Jay Rd:: Closed between 47th St and CO 119/Diagonal Highway from 7 a.m. to 1:45 p.m.
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N 51st St:: Closed between Jay Rd and Boulder Reservoir from 7:15 a.m. to 1 p.m.
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N 55th St:: Closed between Boulder Reservoir and Niwot Rd from 7:30 a.m. to 1 p.m.
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Monarch Rd:: Westbound closure from N 55th St to N 71st St from 7:30 a.m. to noon.
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N 71st St:: Southbound closure between Monarch Rd and Niwot Rd from 7:30 a.m. to noon.
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Niwot Rd:: Eastbound closure between N 55th St and N 73rd St from 7:30 a.m. to noon.
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Pearl St./Pearl Pkwy.:: Closed between 15th Street and 55th Street from midnight to 10 a.m.
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Spruce St.:: Closed from Folsom St. to 14th St. from midnight to 4 p.m.
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47th St.:: Closed in sections between Independence Rd and Pearl St./Pearl Pkwy., and between Independence Rd and Jay Rd during specific hours.
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26th St.:: Closed from Topaz Dr. to Iris Ave. from 7:30 a.m. to 2 p.m.
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Folsom St.:: Closed from Iris Ave. to Pearl St. from 7:30 a.m. to 2 p.m.
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14th St.:: Closed between Spruce St. and Walnut St. from Friday morning through Sunday evening.
While the Fourmile Canyon Creek will remain open, expect heavy runner traffic. Boulder Reservoir will be closed until 1 p.m.
FAQs
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Q: What are the main traffic impacts?
Expect significant road closures and delays in Boulder County and the City of Boulder.
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Q: When will the races take place?
Sunday, September 28, 2025, between 7 a.m. and 4 p.m.
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Q: Where can I find course maps and more information?
Visit the Boulderthon website or contact the community coordinator at 970-610-0556.
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Q: Will residents have access to their homes?
Yes, residents located on or near the racecourses will have access to their homes, sometimes via pilot cars.
Key Takeaways
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Be aware of extensive road closures on Sunday, September 28, 2025, due to the Boulderthon races.
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Plan alternative routes and expect delays if traveling in Boulder County or the City of Boulder.
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Check the Boulderthon website for detailed course maps and traffic impact information.
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Contact the Boulderthon Community Coordinator for specific questions or concerns.
Discussion
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