The Colfax Marathon is Sunday. Here’s what to know about traffic disruptions

Good luck to everyone racing.
3 min. read
Runners head down 17th Avenue in the annual Colfax Marathon’s final leg, May 20, 2018. (Kevin J. Beaty/Denverite) kevinjbeaty; denverite; colorado; denver; north capitol hill; uptown; colfax marathon; running; race;

If, like me, you are a mere mortal whose sole plans for this Sunday involve eating a bagel, beware of detours and road closures due to the Colfax Marathon.

From 6 a.m. to 2 p.m. Sunday, here are the altered Regional Transportation District (RTD) routes:

  • The D and H lines will not stop at Colfax at Auraria station through the downtown loop
  • The D and H lines will detour to stations at Auraria West, Empower Field at Mile High, Ball Arena, Elitch Gardens and Union Station
  • The L line will not run (RTD suggests the 43 bus instead)
  • These bus routes will have detours: 0, 1, 6, 8, 9, 10, 12, 15, 15L, 16, 19, 20, 24, 28, 30, 38, 43, 44, 48, 51, 52, 76, 83L
  • On Saturday, routes 20 and 24 will have minor detours from 9 a.m. to 12 p.m.

RTD also said riders should expect delays. And on Sunday, RTD says it's accepting race bibs as a form of fare payment on the W, 15, 15L and 16, from 6 a.m. to 2 p.m.

Drivers, pedestrians and cyclists will not be able to cross the course, pictured below in blue, while the race is taking place. Road closures start at 6 a.m., and will open on a rolling bases once the final runner passes through each area.

Drivers, pedestrians and cyclists will not be able to cross the race course, pictured in blue, until all runners have passed through. May 19, 2023.
Photo courtesy of Denver Colfax Marathon.

Here are the road closures to expect Sunday, according to a press release from the marathon organizers:

  • York St. between Colfax Ave. and 23rd Ave. from 5:45 am to 8 am
  • 23rd Ave. between York St. and Colorado Blvd. from 5:45 am to 8:15 am
  • 17th Ave. from Detroit St. to York St. from 6:00 am to 10 am.
  • Westbound Colfax Ave. from Elizabeth St. to Speer Blvd. from 5:45am to 10am.
  • Westbound Colfax Ave. from I-25 to Garrison St. in Lakewood from 7:00 am to 12 pm
  • Raleigh St. from westbound Colfax Ave. to 17th Ave. from 7:00am to 9:30am
  • Lawrence St. from Speer Blvd. to 17th St. from 7:00 am to 1:00 pm
  • 17th St. to 17th Ave. from 7:00 am to 1:00 pm
  • 17th Ave. to Vine St. from 7:00 am to 1:00 pm
  • Vine St. from 17th Ave. to 22nd Ave. southbound from 7:00 am to 1:30pm.
  • At least one lane for southbound vehicles on 22nd Ave. from 7:00 am to 1:30 pm
  • At least one lane on 22nd. Ave. from Vine St. to Gaylord St. from 7 am to 1:30 pm
  • Gaylord St. from 22nd Ave. to 21st Ave. from 7:00 am to 1:45 pm.

Most importantly: if you're running the marathon, good luck!

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