DENVER (KDVR) – Boulder will soon fill with thousands of runners ready to compete in the 2024 Boulderthon. Last year’s Boulderthon saw 7,000 runners take part in the races, according to organizers, and the event has doubled in size each year since its inception four years ago.

Packing so many people into one area and ensuring they have access to safe runways will result in street closures and changes throughout downtown Boulder on Sunday.

Kokanee salmon spawn return to Colorado

Below are some of the detours and closures you might encounter when trying to navigate the area.

No parking zones

Closed Friday to Sunday

14th Street – The entire street from Walnut Street to Spruce Street will be closed: Friday 6:00 a.m. to Sunday 7:30 p.m

Closed on Sundays

23rd Street – The entire road from Mapleton Avenue to Pearl Street will be closed from 4 a.m. to 10 a.m

Mapleton Avenue – The westbound lane from Folsom Street to 14th Street will be closed from 4 a.m. to 2 p.m

Spruce Street – The entire street from 13th to 15th streets will be closed from 4 a.m. to 2 p.m

Pearl Street – The entire street from 15th Street to Folsom Street will be closed from 2 a.m. to 10 p.m

18th Street – The entire road from Spruce Street to Walnut Street will be closed from 2 a.m. to 10 p.m

17th Street – The entire street from Spruce Street to Pearl Street will be closed from 2 a.m. to 10 p.m

16th Street – The entire street from Spruce Street to Pearl Street will be closed from 2 a.m. to 10 p.m

15th Street – Parking in front of Barker Park from the alley to Spruce Street: 4 a.m. to 2 p.m

14th Street – The entire road from Mapleton Avenue to Spruce Street will be closed from 4 a.m. to 2 p.m

Why are the streets crooked in downtown Denver? History can explain

Impact on the road on Sunday

Kings Ridge Blvd

Runners cross Kings Ridge Boulevard and residents are checked by an officer from 7:30 a.m. to 1:45 p.m

Access to downtown

Walnut Street east and west – open from 7 a.m. to 2 p.m

28th Street Northbound to Pine Street Eastbound – Open before 6 a.m. and after 10 a.m

Other streets were affected

Niwot Road – Open eastbound and westbound from 7:00 a.m. to 11:00 a.m., delays may occur

95th Street – Open northbound and southbound from 7am to 11am, delays may occur

79th Street – Open 7:00 a.m. to 11:00 a.m. southbound to Lookout Road, no westbound trips after 79th Street

Viewpoint road – Open between Gunpark and 75th Street, delays may occur. Open eastbound from 79th to 95th streets, no westbound traffic from 7 a.m. to 11 a.m

61st and 63rd Streets – Closed to all non-local residential traffic from 7 a.m. to 1 p.m

Jay Road – There will be no westbound travel from 75th Street to Spine Road from 7 a.m. to 1 p.m

57th Street – Open for southbound trips only, no northbound trips from 7 a.m. to 1 p.m

Independence Road – Open for westbound trips only, no eastbound trips from 7 a.m. to 1 p.m

Tired of red lights? This is how they work in Denver

Free parking garages

15th Street and Pearl Street – 1500 Pearl St.

11th Street and Walnut Street, staff and volunteer parking – 1100 walnut pcs.

10th Street and Walnut Street – 1000 walnut pieces.

13th Street and Walnut Street – Intersection of 13th Street and Walnut Street

14th Street and Walnut Street, VIP Runner Parking, Sunday 4:00 a.m. to 8:00 a.m. – 1400 Walnut St.

Rare twin foals were unexpectedly born at a horse rescue in Colorado

A map of all no-parking zones, closures and road restrictions as well as the location of free parking garages can be found on the Boulderthon website.

Copyright 2024 Nexstar Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

For the latest news, weather, sports and streaming video, visit FOX31 Denver.